São José dos Campos, Brazil
São José dos Campos, Brazil

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Vivas M.,State University of Norte Fluminense | Silveira S.F.,State University of Norte Fluminense | Cardoso D.L.,Laboratorio Of Melhoramento Genetico Vegetal | Pereira M.G.,Laboratorio Of Melhoramento Genetico Vegetal | And 2 more authors.
Bragantia | Year: 2012

Genetic resistance represents a sustainable alternative to control powdery-mildew in papaya crop. Diallelic crosses were performed among eight papaya genotypes, belonging to 'Solo' and 'Formosa' heterotic groups, four from each one with aiming to indicate possible hybrid combinations that contribute to reducing the severity of powdery-mildew on leaf. The 56 hybrid combinations (F1's and reciprocals) along with their parents were evaluated in a randomized complete block design with four replications. Powdery-mildew severity on leaves was measured in March and May 2010, respectively, at 11 and 13 months after planting. The general and specific combining ability were estimated from the severity data. Thus, considering the estimates of combining ability, the hybrids 'Maradol x Waimanalo', 'Maradol x Sunrise Solo 72/12', 'JS 12-4 x São Mateus', 'Sekati x Waimanalo', 'Sekati x Golden', 'Sekati x Sunrise Solo 72/12', 'Sekati x São Mateus', 'Waimanalo x São Mateus' e 'Golden x São Mateus' are the best combinations for the parents assessed to the severity of powdery-mildew. The results also show the possibility of obtaining hybrids with potential for reducing the severity of powdery-mildew, from crosses between genotypes of the groups 'Solo' and 'Formosa' and at crossings within the 'Solo' group.


Vivas M.,State University of Norte Fluminense | da Silveira S.F.,State University of Norte Fluminense | Gonzaga Pereira M.,Laboratorio Of Melhoramento Genetico Vegetal | Lucia Cardoso D.,Laboratorio Of Melhoramento Genetico Vegetal | Antonio Ferreguetti G.,Caliman Agricola S.A
Ciencia Rural | Year: 2013

Genetic resistance represents a viable alternative to control phoma-spot in papaya crop. However, basic studies are necessary to base the choice of genitors and hybrid combinations disease resistant. In this research, a diallel cross was conducted involving eight genotypes of papaya, four of the Solo group and four of Formosa group and it was estimated general and specific abilities of combination for the phoma-spot resistance. The treatments were evaluated in a randomized block design with four replications. The severity of phoma-spot in leaves was quantified in two ocasions: March and May of 2010. The genotypes Maradol JS12-N, Sekati e São Mateus show better general combining ability. The hybrids Maradol x Golden, Maradol x Sunrise Solo 72/12, JS12-N x Golden, JS12-4 x Waimanalo, Sekati x Waimanalo, Waimanalo x Golden, Waimanalo x São Mateus, Golden x Sunrise Solo 72/12 and Golden x São Mateus showed promising results for selection, with negatives values of specific combining ability for severity of phoma spot.


Santos M.M.P.,Laboratorio Of Tecnologia Of Alimentos | Vieira-Da-Motta O.,Laboratorio Of Sanidade Animal | Vieira I.J.C.,State University of Norte Fluminense | Braz-Filho R.,State University of Norte Fluminense | And 5 more authors.
Journal of Natural Medicines | Year: 2012

The inhibitory effects of the ethyl acetate extract and capsaicin (1) and dihydrocapsaicin (2) isolated from fruits of Capsicum annuum chili pepper type, and synthetic capsaicinoid derivatives (N-(4-hydroxyphenylethyl)decamide (3), (E)-N-(4-hydroxy-3-methoxybenzyl)-3,7-dimethylocta-2,6-dienamide (4), 4-hydroxy-3-methoxy-N-((E)-3, 7-dimethylocta-2,6-dienyl)benzamide (5) andN-(4-hydroxy-3-methoxybenzyl)decamide (6) at different concentrations were evaluated against Streptococcus mutans. The minimum inhibitory concentration at which the ethyl acetate extract prevented the growth of S. mutans was 2.5 mg/mL; those of the isolated compounds 1 and 2 were 1.25 μg/mL, while 3 was 5.0 μg/mL, and 4, 5 and 6 were 2.5 μg/mL, respectively. © The Japanese Society of Pharmacognosy and Springer 2011.


Dos Santos Esteves B.,State University of Norte Fluminense | De Lima Lousada L.,State University of Norte Fluminense | de Sousa E.F.,Laboratorio Of Engineering Agricola | Campostrin E.,Laboratorio Of Melhoramento Genetico Vegetal
Ciencia Rural | Year: 2015

The methodologies which are considered the most promising for irrigation management are those based on the analysis of the water status of the plants themselves. This justifes the study and improvement of indicators based on automatic and continuous measures to enable real-time monitoring data, as indices from sap fow, dendrometry and leaf turgor pressure techniques. The aim of this paper is to analyze such methodologies in order to demonstrate their principles, advantages and challenges. In conclusion, the methodologies analyzed still have many technological advances and challenges before being presented to the fnal user. The future research should work these tools for elaboration of technical indexes that allow their simplification, on the instrumental point of view, and the interpretation of their results. © 2015, Universidade Federal de Santa Maria. All Rights Reserved.


Silva J.I.,Federal University of Pelotas | Vieira H.D.,State University of Norte Fluminense | Vieira H.D.,Laboratorio Of Fitotecnia | Viana A.P.,State University of Norte Fluminense | And 3 more authors.
Coffee Science | Year: 2010

In coffee transplant production, substrate is one of the factors limiting growth. The ideal substrate should meet the oxygen, water and nutrient requirements for normal plant growth. The objective of this work was to verify the effect of different substrates and containers on the growth of coffee transplants in the nursery, and also to develop a new methodology for producing Coffea canephora Pierre ex A. Froehner transplants using agroindustrial residues. The following containers were used: polyethylene bags, conical tubettes with 80 cc and 120 cc capacity and pressed blocks (mixture of organic material). Each treatment corresponded to one type of substrate and one type of container. The results showed that organic material may be a potential substrate for C. canephora transplant production. The transplants produced in the organic material, organic material + controlled nutrients, soil + cow manure + controlled nutrients substrates presented the best results for all the traits compared, in relation to the other substrates, indicating that they are the best option for producing coffee transplants. The pressed block, polyetilene bags and big size tubettes may be appropriate containers for C. canephora transplant production. The commercial substrate was inadequate for coffee transplant production, regardless of the container.


Vivas M.,State University of Norte Fluminense | da Silveira S.F.,State University of Norte Fluminense | do Amaral A.T.,Laboratorio Of Melhoramento Genetico Vegetal | Cardoso D.L.,Laboratorio Of Melhoramento Genetico Vegetal | Pereira M.G.,Laboratorio Of Melhoramento Genetico Vegetal
Bragantia | Year: 2013

This study aimed to estimate genetic parameters and to study the inheritance of resistance to papaya black-spot, powderymildew and phoma-spot through diallel cross on a field plot experiment. The 56 hybrid combinations (F1's and reciprocals) and eight genotypes of papaya, four of 'Formosa' group ('Maradol', 'JS12-N', 'JS12-4' and 'Sekati') and four of the 'Solo' group ('Waimanalo', 'Golden', 'Sunrise Solo 72-12' and 'São Mateus') were evaluated. The severities of black spot on leaf and fruit and the severity of powdery mildew and phoma spot in leaf were quantified. The analyses of variance of the data were performed considering the intersections and the season (evaluation date) as sources of variation. The severity of black-spot on leaf and fruit and the severity of powdery-mildew had absence of significance concerning the three tests of sufficiency for the additive dominant model. The estimated numbers of genes or gene blocks with dominance indicated the existence of at least four genes or gene blocks to severity of powdery mildew and at least one for severities of black-spot on leaf and fruit. For severity of powdery mildew additive gene effects were more important. Additives and non-additives gene effects were important to the severities of black-spot on leaf and fruit. It was observed effect of partial dominance for severity powdery mildew and complete dominance for severities of black-spot on leaf and fruit. The parent 'Sekati' presented the highest concentration of favorable alleles for the reduction of the black-spot and powdery mildew.

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