Marlon Cristian Toledo Pereira
@producaovegetal.com.br
Departamento de Ciências Agrárias
Universidade Estadual de Montes Claros - Professor
RESEARCH, TEACHING, or OTHER INTERESTS
Agronomy and Crop Science, Horticulture, Agricultural and Biological Sciences, Plant Science
Scopus Publications
Scopus Publications
Débora Francine Gomes Silva Pereira, Silvia Nietsche, Adelica Aparecida Xavier, Maria Olívia Mercadante-Simões, and Marlon Cristian Toledo Pereira
Springer Science and Business Media LLC
Márcio Adriano Santos, Sérgio Luiz Rodrigues Donato, Júlio César Lima Neves, Pedro Ricardo Rocha Marques, Marlon Cristian Toledo Pereira, and Maria Geralda Vilela Rodrigues
Nativa
The objective was to establish and evaluate the similarity of the Kenworthy and DRIS norms for ‘Prata’ banana in soils with improved fertility. The data used were leaf nutrient contents and yields of 180 plots, from an experiment with two cultivars (‘Prata-Anã’ and ‘BRS Platina’), five doses of K2O (0; 200; 400; 600 and 800 kg ha-1) supplied with sources for organic management and six evaluation times (210; 390; 570; 750; 930 and 1,110 days after planting), in a randomized block design in factorial scheme, with three replicates. The database was separated from the average yield, 36.42 t ha-1 cycle-1 for ‘Prata-Anã’ and 38.4 t ha-1 cycle-1 for ‘BRS Platina’, into low-yielding population (LYP) and high-yielding population (HYP). Mean, standard deviation, coefficient of variation, variance and variance ratio (HYP/LYP) of nutrients and their bivariate ratios, direct (A/B) and inverse (B/A), were calculated. ‘Prata-Anã’ and ‘BRS Platina’ in HYP differed in terms of the means and variances for Kenworthy by 33.00%, for the DRIS, the means differed in 71.21% and variances in 43.18% of the cases. The Kenworthy and DRIS norms established support the nutritional diagnosis of ‘Prata-Anã’ and ‘BRS Platina’ banana plants grown in soils with improved fertility.
Débora Francine Gomes Silva Pereira, Pedro Marcus Pereira Vidigal, Samuel A. Santos, Silvia Nietsche, Adelica Aparecida Xavier, and Marlon Cristian Toledo Pereira
Springer Science and Business Media LLC
Bruno Rafael Alves Rodrigues, Charles S. Gasser, Samy Pimenta, Marlon Cristian Toledo Pereira, and Silvia Nietsche
Springer Science and Business Media LLC
Abstract Key message Inheritance of the presence/absence of seeds in Annona squamosa is mediated by a single fully recessive gene and is caused by a deletion of the INNER NO OUTER (INO) locus. Abstract For some fruits, seedless varieties are desirable for consumption and processing. In the sugar apple tree (Annona squamosa L.), the seedless trait in the Thai seedless (Ts) and Brazilian seedless (Bs) accessions was associated with defective ovules and an apparent deletion of the INNER NO OUTER (INO) ovule development gene locus. Segregation analysis of F2 and backcross descendants of crosses of Bs to fertile wild-type varieties in this species with a multi-year generation time showed that seedlessness was recessive and controlled by a single locus. Comparison of whole genome sequence of a wild-type plant and a third accession, Hawaiian seedless (Hs), identified a 16 kilobase deletion including INO in this line. Ts and Bs lines were shown to have an identical deletion, indicating a common origin from a single deletion event. Analysis of microsatellite markers could not preclude the possibility that all three seedless accessions are vegetatively propagated clones. The sequence of the deletion site enabled a codominant assay for the wild-type and mutant genes allowing observation of complete cosegregation of the seedless/defective ovule phenotype with the INO deletion, showing maximal separation of less than 3.5 cM. The observed deletion is the only significant difference between the wild-type and Hs line over 587 kilobases, likely encompassing much more than 3.5 cM, showing that the deletion is the cause of seedless trait. The codominant markers and obtained progenies will be useful for introgression of the seedless trait into elite sugar apple lines and into other Annonas through interspecific crossings.
Gabriela Cristina Alves Custódio, Samy Pimenta, Fátima de Souza Gomes, Nadiany S. Silva, Bruno Rafael Alves Rodrigues, Fabrícia Cardoso Oliveira, Nelson de Abreu Delvaux Júnior, and Marlon Cristian Toledo Pereira
Walter de Gruyter GmbH
ABSTRACT Ornamental peppers have a significant economic importance in the national and international markets; however, few cultivars intended for this purpose are grown in Brazil. The objective of this study was to select partially inbred lines (PIL) of peppers with ornamental potential, based on quantitative and qualitative variables with high heritability. The study was conducted over six generations for 4 consecutive years, using the single seed descent method. The last phase (VI) consisted of growing plants of the F5 generation for selection. Qualitative (LD) and quantitative (QD) descriptors were considered and the ideal genotypes were defined. The statistical analyses consisted of estimating variance components and genetic parameters and predicting genetic values, using REML/BLUP for QD, except for cycle to flowering (CF) and cycle to maturation (CM), which were analysed qualitatively. Therefore, CF and CM were analysed through frequency distribution of continuous variables within class intervals. Descriptive statistics were used to evaluate LD. The results showed that residual values exceeded genetic values, resulting in low heritability for QD, and therefore, they were not considered for PIL selection. Regarding LD, genetic variability was found among the population genotypes for all evaluated descriptors. The selection based on ideal genotypes enabled the selection of 82 PIL with LD of high ornamental value, which differ from the materials already available on the market. The selected genotypes will be used for developing future generations until allele fixation, focussed on subsequent selection of candidate lines for new ornamental pepper cultivars.
Lucicleia Borges de Almeida, Marlon Cristian Toledo Pereira, Samy Pimenta, Silvia Nietsche, Adelica Aparecida Xavier, and Allyson Gabriel Santos de Paula
FapUNIFESP (SciELO)
Abstract The evaluation of new banana genotypes with agronomic potential and tolerant to the main pests and diseases is essential for the market. The objective was to evaluate the vegetative and productive characteristics of new potential banana clones, such as ‘Prata Gorutuba R1’ and ‘Prata Gorutuba R2’ and commercial cultivars. The experiment was implemented in a rural property located in the municipality of Nova Porteirinha, MG. The treatments consisted of ‘Prata Gorutuba R1’ and ‘Prata Gorutuba R2’ banana clones (genotypes selected from the ‘Prata Anã’ clone ‘Gorutuba’ tolerant to Panama disease) and four cultivars: ‘Prata Gorutuba’, ‘Prata Anã’, ‘Grande Naine’ and ‘BRS Princesa’. The treatments were distributed in randomized blocks, with four replications and six useful plants per plot. The planting spacing used was 3.5 m x 1.7 m. The evaluations were carried out in the first and second production cycles. The ‘Prata Gorutuba R1’ and’ Prata Gorutuba R2’ clones in general showed excellent performance compared to the already consolidated cultivars. The clones presented median height and number of leaves in the ideal flowering for banana trees of the ‘Prata’ subgroup. Bunch and bunch weight, as well as production were similar to the ‘Prata Anã’, ‘Prata Gorutuba’ and ‘BRS Princesa’ cultivars. Considering that the clones evaluated present high tolerance to Fusarium wilt, the result indicates that the materials have great potential for the registration of new cultivars.
Thaís Angélica de Souza Soares, Marlon Cristian Toledo Pereira, Lucicléia Borges de Almeida, Silvia Nietsche, Samy Pimenta, and Bruno Rafael Alves Rodrigues
FapUNIFESP (SciELO)
Abstract The characterization of clones is a very important step in genetic certification programs, as it describes and recognizes the plant material at every stage of production, allowing the monitoring of genetic quality, improvement and conservation of the germplasm. The aim of this work was to morphologically characterize two elite banana clones. The experimental design applied was in randomized blocks, with four replications, with six plants per parcel. The treatments consisted of two elite banana clones, Prata Gorutuba R1 and Prata Gorutuba R2 and four commercial cultivars: Prata Gorutuba, Prata Ana, Grande Naine and BRS Princesa. The morphological characterization was carried out in the second production cycle (daughter plant), using 23 qualitative descriptors, visually evaluated, classified according to the instructions for carrying out the distinguishability, homogeneity and stability (DHS) tests of banana cultivars. The elite clones Prata Gorutuba R1 and R2 differed from the cultivars Grande Naine and BRS Princesa regarding the descriptors tapering of the pseudostem, predominant color of the pseudostem, intensity of anthocyanin coloration and color of the underside of the basal sheath. The descriptors made it possible to group elite clones into the Prata group, a group that predominates in crops in Brazil, with characteristics already widely accepted by the market.
Adriana Barbosa do Nascimento, Marlon Cristian Toledo Pereira, Patrícia Cristina do Carmo Oliveira, Teresinha Augusta Giustolin, and Clarice Diniz Alvarenga
FapUNIFESP (SciELO)
Abstract Cerconota anonella (fruit borer) and Bephratelloides pomorum (seed borer) are the main pests of Annonaceae and knowing their population dynamics is essential to establish their management in orchards of these crops. The objective of this study was to evaluate the influence of native vegetation on the population of fruit and seed borers in two production seasons in an atemoya orchard in the semiarid region. The study was carried out in a commercial atemoya orchard in Janaúba, MG. The experimental area was divided into two parcels and, in each of them, the distance from the experimental plots to the surrounding vegetation, of approximately 10m, 33m, 57m and 81m, was recorded. The sampling of insects was carried out at different periods, spring and summer, through the collection, every two weeks, of atemoya fruits containing attack signs by the borers. The intensity of infestation of each borer species was determined. The intensity of borer infestation varies between seasons, with fruit borer infestation in summer and seed borer infestation in spring. The distance from the orchard to the adjacent vegetation does not interfere with the infestation intensity of fruit and seed borers.
Bruna Béssel Almeida Porto Nogueira, Débora Souza Mendes, Rosane Borges Mendes, Samy Pimenta, Marlon Cristian Toledo Pereira, Alcinei Místico Azevedo, and Silvia Nietsche
Elsevier BV
Bruno Rafael Alves Rodrigues, Silvia Nietsche, Samy Pimenta, and Marlon Cristian Toledo Pereira
FapUNIFESP (SciELO)
Márcio Adriano Santos, Sérgio Luiz Rodrigues Donato, Júlio César Lima Neves, Pedro Ricardo Rocha Marques, Marlon Cristian Toledo Pereira, and Maria Geralda Vilela Rodrigues
FapUNIFESP (SciELO)
Abstract The objective of this work was to establish, through different diagnostic methods, nutrient reference values for ‘Prata-Anã’ banana in improved fertility soil. The study included a database from an experiment conducted in randomized block design, arranged in a 5 × 6 factorial scheme (five doses of K2O - 0; 200; 400; 600 and 800 kg ha-1, supplied by cattle manure and rock powder × six evaluations of leaf nutrition and yield – 210; 390; 570; 750; 930 and 1,110 days after planting), with three replicates, totaling 90 samples. The reference values were determined by the Sufficiency Range, Critical Level by the Reduced Normal Distribution, Boundary Line and Mathematical Chance methods. Plots with high yield, = 36.42 t ha-1 cycle-1, formed the reference population and plots with yield = 45.79 t ha-1 formed the reference subpopulation. The methods were efficient in determining the nutrient reference values of ‘Prata-Anã’ banana. In general, the values established are higher than those reported in the literature, justified by the greater chemical fertility of the soil. Among the diagnostic methods, the Mathematical Chance presented itself as the most accurate for interpreting the nutrient contents in the leaves of ‘Prata-Anã’ banana under improved soil fertility conditions.
Márcio Adriano Santos, Sérgio Luiz Rodrigues Donato, Júlio César Lima Neves, Pedro Ricardo Rocha Marques, Marlon Cristian Toledo Pereira, and Maria Geralda Vilela Rodrigues
FapUNIFESP (SciELO)
ABSTRACT Reference values of leaf nutrient contents are essential for nutritional assessment of plants. The objective was to establish nutritional reference values for ‘BRS Platina’ banana in improved fertility soil, using the sufficiency range (SR), border Line (BL) and mathematical chance (MCh) methods, in addition to the critical level obtained by the reduced normal distribution (CLz). The study was carried out in Guanambi-BA, considering nutrient contents and yields of an experiment arranged in randomized blocks, 5 x 6 factorial scheme, with five doses of K2O (0, 200, 400, 600 and 800 kg ha-1) supplied with fertilizers for organic management and six sampling times (210; 390; 570; 750; 930 and 1,110 days after planting), totaling 90 plots. Plots with high yield, ≥ 38.40 t ha-1, formed the reference population and plots with yield ≥ 47.43 t ha-1 formed the reference subpopulation. There was convergence between the optimal values obtained by the methods evaluated. Therefore, the reference values adjusted by the SR, BL, MCh and CLz methods can be used with assertiveness to interpret the foliar analysis of the ‘BRS Platina’ banana in improved fertility soils. Furthermore, among these, MCh stands out as it provides narrower optimal ranges.
Jéssica Guerra Calaes, Luciana Cardoso Nogueira Londe, Maurício Mendes Cardoso, Marlon Cristian Toledo Pereira, and Wlly Poliana Antunes Dias
Southern Cross Publishing
The objective of this work was to evaluate the use of packaging to maintain quality and extending the postharvest life of umbu tree fruits in different storage periods, stored at 14 ° C and 90% UR. The experimental design used was completely randomized, in a 4 x 4 factorial scheme, with four evaluation periods (0, 4, 8 and 12 days after storage) and four packaging systems (PET, PET with holes, PVC and LDPE), with four replicates and four fruits per experimental unit. The physical and chemical characteristics were evaluated, such as, objective color of the peel, firmness of the intact fruit, soluble solids, titratable acidity, pH and loss of fresh mass. The results were submitted to analysis of variance and regression, using the SISVAR software program. The characteristics of the quantitative factor (types of packaging) were compared by the Tukey’s test at 5% probability, while for those of the qualitative factor (storage period), the adjustment was made to the regression model. There was a significant interaction between packaging and storage periods only for loss of mass. The luminosity characteristic was significant only for the type of packaging. For the other variables such as chroma, HUE angle, firmness, titratable acidity and pH, there was no significant interaction between the factors tested, having significance only for storage period. For soluble solids, there was no significance for packaging and storage period. The PVC and PET packaging were effective in delaying the loss of mass, and withering of the fruits up to 12 days, which kept under refrigeration at 14°C. It was verified that along the storage time, physical and chemical changes occur in the umbu tree fruits.
Cristiane Gonçalves Souza, Sabrina Maihave Barbosa Ramos, Silvia Nietsche, Clivia Carolina Fiorilo Possobom, Elka Fabiana Aparecida Almeida, and Marlon Cristian Toledo Pereira
FapUNIFESP (SciELO)
Abstract Adenium obesum (Forssk.) Roem. & Schult., popularly known as desert rose, has become a valuable ornamental plant. In floriculture, the production of hybrids is prioritized. Hence, knowledge on floral biology and sexual reproduction of the target species is fundamental. The objectives of this study were: (1) to test sucrose concentrations and temperatures for in vitro germination of A. obesum pollen grains; (2) to identify the effect of temperature on the viability of A. obesum pollen grains; and (3) to evaluate the viability of pollen grains and stigma receptivity in pre-anthesis, at flower opening, and 72 h post-flower opening in three accessions of A. obesum. A significant relationship between temperatures and sucrose concentrations was observed in the in vitro germination test. The highest percentage of in vitro germination of pollen grains, 39.81%, was observed at an estimated temperature of 26.05 °C. Desert rose accessions maintained in biochemical oxygen demand (BOD) chambers at 30 °C during a 16-h light photoperiod showed faster flowering, and temperatures ≥ 25 °C induced pollen grain viability percentages above 69%. Temperature is one of the most important abiotic factors, influencing mainly in pollen germination, pollen tube growing and in efficiency fertilization. The ICA-wd accession stood out and can be considered a pollen donor in artificial pollination. The stigmas of flowers were receptive from a day before flower opening until three days after. The two parameters presented above, stigma receptivity and pollen viability, allow inferences about the appropriate time for successful pollination and subsequent fertilization in desert roses.
Lucicléia Borges de Almeida, M. C. Pereira, D. C. Bastos, S. Pimenta, J. Pinheiro and S. Nietsche
The objective of this work was to evaluate the fruit quality of Tahiti acid lime and Sicilian lemon trees grownon different rootstocks and planting spacings in the semi-arid region of the state of Minas Gerais, Brazil. Twoexperiments were conducted, using Tahiti acid lime tree scions (Citrus latifolia Tanaka) (1) and Sicilian lemontrees scions [Citrus limon (L.) Burm] (2). A randomized block design was used, with a 6×2 factorial arrangement consisted of six rootstocks: Cravo Santa Cruz lemon (Citrus limonia Osbeck), Swingle citrumelo [Citrus paradisi Macfaden × Poncirus trifoliata (L.) Rafinesque], Indio citrandarin and Riverside citrandarin [Citrus sunki (Hayata) hort. ex Tanaka × Poncirus trifoliata (L.) Rafinesque], Hybrid TSKC × (LCR × TR) - 059 [Citrus sunki (Hayata) hort. ex Tanaka × (Citrus limonia Osbeck × Poncirus trifoliata (L.) Rafinesque)], and Sunki Tropical tangerine [Citrus sunki (Hayata) hort. ex Tanaka]; and two planting spacings: 6.0 × 4.0 m and 6.0 × 2.0 m, with three replications and four plants per plot. The physical and chemical characteristics of fruits were evaluated. Most quality characteristics of Tahiti acid lime and Sicilian lemon are not affected by the different rootstocks and spacings used, but the fruits present excellent quality for the national and international markets. Tahiti acid lime plants grown on less vigorous rootstocks under denser spacings have fruits with higher pH, whereas those grown on more vigorous rootstocks have fruits with thicker mesocarps and lower soluble solid contents. The use of Sunki Tropical tangerine rootstock results in bigger Sicilian lemons, however, with lower soluble solid contents, whereas an opposite result is found with the use of Swingle citrumelo rootstocks.
Moacir Brito Oliveira, Maria Gabriela Ferreira Figueiredo, Marlon Cristian Toledo Pereira, Maria Aparecida do Carmo Mouco, Leonardo Monteiro Ribeiro, and Maria Olívia Mercadante-Simões
Elsevier BV
Célia Lúcia Siqueira, Marlon Cristian Toledo Pereira, Silvia Nietsche, Adelica Aparecida Xavier, Athos Henrique Mendes, Helisson Robert Araújo Xavier, Railton de Souza Guimarães, Danilo Reis Lacerda, and Silvânio Rodrigues dos Santos
FapUNIFESP (SciELO)
Increased planting density, different types of thinning management, and the use of beneficial microorganisms have been adopted as strategic tools in the effort to increase crop yields in a sustainable manner. This investigation evaluated the growth and production of ‘Prata Anã Gorutuba’ banana (Musa spp., AAB) under different plant densities during two production cycles in the semiarid region of Minas Gerais, Brazil. Micropropagated plantlets were also inoculated with endophytic bacteria and cultivated as part of two mat management strategies. Planting density varied between 1,680 and 3,920 plant ha–1. During the experiment, water was less than optimal because of rationing due to drought in the region. Under field conditions, there was no difference between bacterially inoculated and non-inoculated plants. The dense planting system increased the crop cycle. The highest-density planting treatment (3,920 plant ha–1) resulted in the highest yield in the first cycle, but no net income was observed. However, the high-density planting treatments resulted in the highest yields and gross incomes in the second production cycle. Management with thinning of plants up to 10-months-old and thinning up to harvest associated with high planting density increased the length of the production cycles. Although the water restriction experienced in the first and second crop cycles, the vegetative and productive traits of ‘Prata Anã Gorutuba’ banana did not compromise the objectives of this study.
Rayane Carneiro dos Santos, Silvia Nietsche, Marlon Cristian Toledo Pereira, Leonardo Monteiro Ribeiro, Maria Olívia Mercadante-Simões, and Bruna H. Carneiro dos Santos
Springer Science and Business Media LLC
Marlon Cristian Toledo Pereira, Silvia Nietsche, Jonathan Henry Crane, Wanda Montas, Célia Lúcia Siqueira, and Josiele Silva Rocha
FapUNIFESP (SciELO)
ABSTRACT: The present research aimed to evaluate the effect of applying gibberellic acid (GA3) with hand (HP) or natural pollination (NP) on fruit set and the fruit quality of ‘Red’ and ‘Lessard Thai’ sugar apple and ‘Gefner’ atemoya fruits.This study was performed in an experimental orchard located in Homestead, Florida, USA. The experimental design included randomized blocks, with eight treatments, four replicates and four plants per plot. Treatments included: (1) HP; (2) HP + 10 mg L-1 GA3; (3) HP + 100 mg L-1 GA3; (4) HP + 1,000 mg L-1 GA3; (5) NP; (6) NP + 10 mg L-1 GA3; (7) NP + 100 mg L-1 GA3 and (8) NP + 1,000 mg L-1 GA3. The HP plus 1,000 mg L-1 GA3 promoted fruit setting above 90% over the 14 weeks for all genotypes evaluated. Significant increments for length and total fruit weight were observed. ‘Red’ sugar apple and atemoya had a reduced number of seeds per fruit. The NP plus GA3 (1,000 mg L-1) was effective in producing high quality seedless ‘Gefner’ atemoya fruits. This investigationdemonstratedthat GA3 plus hand pollination produced high quality sugar apple and atemoya seeded fruits and in association with natural pollination promoted seedless ‘Gefner’atemoya fruits.
G.C. SANTOS, V.M. MAIA, I. ASPIAZÚ, M.C.T. PEREIRA, S.L.R. DONATO, and D.A.C. NOBRE
FapUNIFESP (SciELO)
ABSTRACT: In the state of Minas Gerais, the northern region is one of the main banana production cores. Weed interference can reduce crop growth and, consequently, lead to reduced yield and fruit quality. Therefore, the objective of this study was to evaluate the interference of weeds in the production of the first and second cycles of ‘Prata-Anã’ bananas. The experimental design was randomized blocks, with ten treatments and three replicates, evaluated in two crop cycles. The treatments were ten periods of weed control, from planting: without control; control throughout the whole experimental period; control only in the first month after planting; control until the second; third; fourth; fifth; sixth; eighth and tenth months after planting. The agronomic and productive characteristics of the ‘Prata-Anã’ bananas were evaluated aton harvest. The maintenance of ‘Prata-Anã’ bananas without weed coexistence for up to 30 days after planting was enough to obtain fruits with satisfactory quality and productivity, both in the first and in the second production cycle, without altering the vegetative and reproductive cycles.
Débora Souza Mendes, Marlon Cristian Toledo Pereira, Silvia Nietsche, Helisson Robert Araujo Xavier, Pedro Tiago Medeiros Paixão, and Matheus Pinheiro Fonseca
FapUNIFESP (SciELO)
Submitted on May 27 , 2019 and accepted on June 24 , 2019. 1 Universidade Estadual de Montes Claros, Departamento de Ciências Agrárias, Janaúba 39440-000, Minas Gerais, Brasil. deborasouzamendes@yahoo.com.br; marlon.pereira@unimontes.br; helissonroberth@hotmail.com; matheus_16pinheiro@hotmail.com Universidade Federal de Minas Gerais, Instituto de Ciências Agrárias, Montes Claros, 39404-547 , Minas Gerais, Brasil. silvia.nietsche@gmail.com Universidade Federal de Viçosa, Departamento de Estatística, Viçosa, 36570-977, Minas Gerais, Brasil. pedro.t.m.paixao@gmail.com * Corresponding author: silvia.nietsche@gmail.com Phenology and thermal requirements of the atemoya tree ( Annona cherimola Mill. X Annona squamosa L.)
JOSIELE S. ROCHA, SILVIA NIETSCHE, MARLON C.T. PEREIRA, MERCADANTE-SIMÕES MARIA O., RAYANE C. SANTOS, and ADELICA A. XAVIER
FapUNIFESP (SciELO)
The banana tree is associated with different species of endophytic bacteria that can stimulate plant growth. However, further studies are needed to better understand the relationships between this group of bacteria and the host plant. The objective of this study was to investigate the localization of the EB-40 (Bacillus sp.) through anatomical and ultrastructural analyses in micropropagated banana plantlets. The results demonstrated the effective colonization of the EB-40 isolate in the intercellular and intracellular spaces, as well as in the rhizosphere region. The wall of endophytic bacteria contains calcium and nitrogen. The EB-40 isolate was also observed to associate with the plasma membrane and cell wall. These results further our understanding of the mechanisms involved in the colonization of plant cells by endophytic bacteria in micropropagated banana plantlets.
M.B. Oliveira, R.P. Sales, A.A. Xavier, R.C.F. Ribeiro, M.K. Kondo, M.X.V. Megda, M.C.T. Pereira, I.P. Santos, J.D. Ferreira, R.S. Martins,et al.
International Society for Horticultural Science (ISHS)
The soil and climatic conditions of the Brazilian semi-arid region allowed the expansion of the mango crops to serve the internal and external markets, through technologies for managing the production season with the use of plant regulators. This study evaluated the effect of different levels of the plant regulator paclobutrazol (PBZ) on the microbial activity of an Argisol cultivated with 'Palmer' mango, in the semi-arid region of northern Minas Gerais. The work was set up in a randomized block design with five levels of PBZ applied to the soil, equivalent to 0.75, 1.50, 2.25, 3.00 and 3.75 g of active ingredient per linear meter of canopy, in addition to one control, in four replications. For the evaluations, a composite sample formed by 15 sub samples of soil collected between 0 and 0.1 m depth and at 0.3 m around the trunk of the plant was used. PBZ was applied and soil respiration (evolution of C-CO(2) was evaluated every seven days. At the end, carbon in the soil microbial biomass (MBC), soil microbial metabolic quotient (qCO(2)), and percentage of fungi or bacteria were determined by plaque counting. PBZ promoted a negative impact on the soil microbiota, increasing the damage with PBZ levels, indicated by the lower values of microbial respiration and MBC. PBZ levels greater than 0.75 g a.i. per linear meter of canopy promoted a marked reduction in MBC and higher levels of qCO(2), an ecological indicator of microbiota stress.
R.P. Sales, M.B. Oliveira, J.M. Leite, M.K. Kondo, R.F. Pegoraro, M.A.C Mouco, M.C.T. Pereira, I.P. Santos, R.S. Martins, and G. Franco
International Society for Horticultural Science (ISHS)
Ethylene is an important hormone in the floral induction process of the mango tree. However, climatic conditions such as the high temperatures that occur in the Brazilian semi-arid can raise the levels of ethylene and cause abortion of flowers and fruits, impairing the production. Thus, the goal of this study was to evaluate the effect of the ethylene biosynthesis inhibitor complex (Ni, Co and Mo) on flowering and ‘Palmer’ mango production. The experiment was set up in a randomized block design with six treatments and four replications. The treatments were five increasing levels of the commercial product Profol NiCoMo Dry® (Ni: 2.4%, Co: 1.2% and Mo: 26%) at concentrations of 0.25, 0.50, 0.75, 1.00 and 1.25 g L(‑1) and a control, in a volume of 800 L ha(‑1), at pre-flowering. Three weekly applications were carried out, starting with the second application of nitrate for floral induction. Evaluations were made for the number and length of panicles; number of fruits branch(‑1) of the sun rising side (NFRN), of the west side (NFRP) and total (NFR); length, diameter and fruit mass. The increase in the levels of Profol NiCoMo Dry up to 1.25 g L(‑1) promoted a linear increase in panicle length, fruit set and total number of fruit plant‑1, resulting in a linear reduction of fruit size (mass), without compromising the commercial standard. Increasing levels of Profol NiCoMo Dry up to 1.25 g L(‑1) promoted a cubic response in fruit yield, with the lowest obtained (23.30 t ha‑1) when using 0.1 g L(‑1) and the maximum (36.20 t ha(‑1)) for the level of 1.23 g L(‑1).