Research Article

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2/23/2017
Ascomycota; Brazil; Carica; Crops, Agricultural; Disease resistance; Fruit; Genotype; Hybrid Vigor; Hybridization, Genetic; Inbreeding; Plant breeding; Plant Diseases; Plant Leaves; Reproducibility of Results

Papaya crop is important to Brazilian agribusiness. However, the expansion of papaya cultivation in the country is affected by the absence of commercial cultivars presenting good disease resistance. The black-spot caused by the fungus Asperisporium caricae is the most damaging foliar disease affecting Brazilian papaya crops. The use of genetically resistant cultivars is a promising strategy to ... more

T.P.S. Poltronieri; S.F. Silveira; M. Vivas; S. Catarina; D.F.M. Cortes; A.O.N. Azevedo; M.G. Pereira
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This study aimed to identify Capsicum genotypes with resistance to bacterial spot (BS), anthracnose and Pepper yellow mosaic virus (PepYMV). Fifty-four genotypes of Capsicum spp were evaluated. Resistance reaction against BS was evaluated using three replicates, testing hypersensitivity and quantitative resistance in leaves. After evaluation, inoculated leaves were detached from the plants, ... more

C.S. Bento; A.G. de Souza; C.P. Sudré; S. Pimenta; R. Rodrigues
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Alleles; Ascomycota; Basidiomycota; Disease resistance; Genotype; Hybridization, Genetic; Plant breeding; Plant Diseases; Selective breeding; Vigna

This study aimed at identifying and selecting through partial diallel analysis, segregating populations of cowpea resistant to Macrophomina phaseolina and Thanatephorus cucumeris, based on the evaluation of general (GCA) and specific combining ability (SCA), involved in the genetic control of resistance. For this reason, 19 grouped cowpea genotypes, considering the resistance to these ... more

L.R.L. Lima; K.J. Damasceno-Silva; M.A. Noronha; D.A. Schurt; M.M. Rocha
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The tomato is the second most produced vegetable in the world, with significant participation in the human diet. In addition, the production of tomatoes generates jobs and family income. The availability of improved cultivars that provide greater profitability to the producer and satisfactorily meets the needs of the fresh fruit market and the processing industry becomes imperative due to its ... more

J.V.M. Peixoto; deM.S. Neto; L.F.C. Campos; deS. Dourado; A.P.O. Nogueira; D.R. Nascimento
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Animals; Disease resistance; Genotype; Host-Parasite Interactions; Multivariate analysis; Phaseolus; Plant Diseases; Plant Roots; Random Allocation; seeds; Tylenchoidea

The availability of common bean cultivars tolerant to Meloidogyne javanica is limited in Brazil. Thus, the present study aimed to evaluate the reactions of 33 common bean genotypes (23 landrace, 8 commercial, 1 susceptible standard and 1 resistant standard) to M. javanica, employing multivariate statistics to discriminate the reaction of the genotypes. The experiment was conducted in a ... more

L.N.S. Santos; P.D.S. Cabral; G.A.R. Neves; F.R. Alves; M.B. Teixeira; F.N. Cunha; N.F. Silva
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Guava (Psidium guajava L.) crop is severely affected by the nematode Meloidogyne enterolobii. Native Psidium species have been reported as sources of resistance against this nematode. Knowledge on the molecular relationship between Psidium species based on plant resistance gene analogs (RGA) can be useful in the genetic breeding of guava for resistance to M. enterolobii. In this study, RGA ... more

L.R. Noia; A.C. Tuler; A. Ferreira; M.F.S. Ferreira
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Disease resistance; Fusarium; Gene Expression Regulation, Plant; Plant Proteins; Plant Roots; Proteome; Solanum lycopersicum; Stress, Physiological

Fusarium wilt caused by Fusarium oxysporum f. sp lycopersici (Fol) is one of the main diseases affecting tomatoes. The BHRS 2,3 genotype of tomato is, however, resistant to this disease. A proteomic approach was used to understand the defense mechanisms of this genotype using the tomato root, the first tissue that interacts with the fungus, as a target. Protein was extracted and separated by ... more

T.D. Silva; C.M.A. Almeida; C.B. Malafaia; L.M.S. Oliveira; M.V. Silva; M.T.S. Correia
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Crop Production; Crosses, Genetic; Dehydration; Genotype; Plant Transpiration; Solanum lycopersicum; Stress, Physiological; Water

Water stress can affect the yield in tomato crops and, despite this, there are few types of research aiming to select tomato genotypes resistant to the water stress using physiological parameters. This experiment aimed to study the variables that are related to the gas exchanges and the efficiency in water use, in the selection of tomato genotypes tolerant to water stress. It was done in a ... more

M.E.A. Borba; G.M. Maciel; E.F.Fraga Júnior; C.S.Machado Júnior; G.R. Marquez; I.G. Silva; R.S. Almeida
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The State of Rio Grande do Sul (RS) is the largest producer of oat in Brazil with the aid of consolidated breeding programs, which are constantly releasing new cultivars. The main objectives of this study were to: 1) evaluate the annual genetic progress in grain yield and hectoliter weight of the oat cultivars in RS, with and without fungicide use on aerial parts of plants; and 2) evaluate the ... more

D.N. Follmann; C. Filho; A.D. Lúcio; V.Q. de Souza; M. Caraffa; C.A. Wartha
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Animals; Cloning, Molecular; Disease resistance; Flavonoids; Gene Expression Regulation, Enzymologic; Gene Expression Regulation, Plant; Genes, Plant; Insecta; Metabolic Networks and Pathways; Pinus; Plant Diseases

Pinus massoniana Lamb. is an important timber and turpentine-producing tree species in China. Dendrolimus punctatus and Dasychira axutha are leaf-eating pests that have harmful effects on P. massoniana production. Few studies have focused on the molecular mechanisms underlying pest resistance in P. massoniana. Based on sequencing analysis of the transcriptomes of insect-resistant P. massoniana ... more

Z.Q. Yang; H. Chen; J.H. Tan; H.L. Xu; J. Jia; Y.H. Feng

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