Herança da resistência a stemphylium solani e insensibilidade a sua fitotoxina em cultivares de algodoeiro

Mehta, Y. R.; Arias, C. A. A.

doi:10.1590/s0100-41582001000400013

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…As a consequence, the additive variance identifies the genotypes of tomato plants which are less attacked by tomato leafminers, namely, genotypes which are resistant by antixenosis to tomato leafminers. By studying the genetic inheritance of the resistance of Stemphylium solani and its phytotoxin, in three cotton cultivars, Mehta & Arias (2001) observed that epistatic effects represent 9.62% of the available variability. The authors also pointed out that, although the values of the effects are low, they should not be disregarded, because they are important to define the breeding program.…”

Section: Resultsmentioning

confidence: 99%

Tomato plant inheritance of antixenotic resistance to tomato leafminer

Antônio

Silva²,

Picanço³

et al. 2011

Pesq. agropec. bras.

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-The objective of this work was to determine the inheritance of resistance by antixenosis in tomato plants (Lycopersicon esculentum) to tomato leafminer [Tuta absoluta (Lepidoptera: Gelechiidae)]. Evaluations were performed for tomato plants of the generations P 1 , P 2 , F 1 , F 2 , RC 1 and RC 2 . The measured characteristic in the parents, BGH-1497 (P 2 male) and 'Santa Clara' (P 1 female), and in the F 1 , F 2 , RC 1 and RC 2 generations was the number of eggs per plant. This number was converted to the oviposition nonpreference index. The inheritance of antixenosis resistance of genotype BGH-1497 is ruled by a gene of greater effect and polygenes in epistatic interactions, with a phenotypic proportion of 13:3 between susceptible and resistant genotypes, respectively.

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Section: Resultsmentioning

confidence: 99%

Tomato plant inheritance of antixenotic resistance to tomato leafminer

Antônio

Silva²,

Picanço³

et al. 2011

Pesq. agropec. bras.

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“…Seeds of the parental genotypes along with the segregating populations were simultaneously multiplied at all stages under glasshouse conditions to avoid effect of age of the seed in the expression of disease symptoms (Mehta et al, 2001;Mehta & Arias, 2002).…”

Section: Seed Materials and Crossesmentioning

confidence: 99%

Mechanism of resistance and presence of different resistance genes to Ramularia areola in two cotton genotypes

Zandoná¹,

Novaes²,

Nunes³

et al. 2012

Trop. plant pathol.

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Earlier studies showed that the resistance of cotton genotype FMT 02102996 to Ramularia areola is governed by one dominant gene. More recently, the resistance of another genotype CNPA BA 2003-2059 to R. areola was detected under field and glasshouse conditions. Present investigation was conducted to verify the mechanism of resistance of the genotype CNPA BA 2003-2059 and to find out if the resistance of these two genotypes is governed by the same or by different genes. Segregating plant populations derived from the cross between the resistant genotype CNPA BA 2003-2059 and the susceptible genotype FMT 701, the back cross populations, as well as those derived from the cross between the two resistant genotypes were evaluated for disease severity by artificial inoculations under glasshouse conditions. The ratio of plants segregating for resistance and susceptibility was studied by χ2 test. The results indicated that the resistance to R. areola in genotype CNPA BA 2003-2059 is governed by one dominant gene and that the resistance in each one of the resistant genotypes is governed by a different dominant gene. These results may assist the local breeding programs aimed at pyramiding resistance genes to this pathogen and may form the basis for genetic mapping of resistance genes. Key words: Gossypium hirsutum, genetics, inheritance of resistance. RESUMO Mecanismo de resistência e presença de genes diferentes de resistência a Ramularia areola em dois genótipos de algodoeiroA mancha-de-ramulária, causada por Ramularia areola, é uma das doenças de importância econômica para o Brasil. Estudos anteriores demonstraram que a herança da resistência do genótipo FMT 02102996 a R. areola é governada por um gene dominante. Recentemente, a resistência do genótipo CNPA BA 2003-2059 a este patógeno foi verificada em casa de vegetação e no campo. O presente estudo foi realizado para verificar o mecanismo de resistência deste genótipo e verificar se os genes de resistência dos dois genótipos resistentes são os mesmos. Foram avaliadas populações segregantes derivadas do cruzamento entre o genótipo resistente CNPA BA 2003-2059 e o genótipo suscetível FMT 701, dos retrocruzamentos, e também do cruzamento entre os dois genótipos resistentes. As plantas foram classificadas como resistentes ou suscetíveis por meio de inoculação artificial. Com base nos resultados, constatou-se que a resistência do genótipo CNPA BA 2003-2059 é condicionada por um gene dominante e que os dois genótipos possuem um gene diferente de resistência. Estes resultados podem auxiliar o planejamento dos programas de melhoramento do algodoeiro visando piramidar genes de resistência a R. areola em novas cultivares, ao mesmo tempo constituindo informação básica para o início de trabalhos de mapeamento genético deste gene de resistência. Palavras-chave: Gossypium hirsutum, genética, herança de resistência.

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“…malvacearum bacterium, is controlled by one dominant gene in Delta Opal and Epamig Liça cultivars, and by two dominant genes in Fibermax 986 cultivar (Zandoná et al, 2005). Metha & Arias (2001) have studied F 2 e F 2:3 populations descending from the crosses: 'PR 94-82' (R) x 'IAPAR 71' (S), 'PR 94-215' (R) x 'IAPAR 71' (S) and 'CNPA PRECOCE 2' (R) x 'IAPAR 71' (S). The authors have identified that the resistance to Stemphylium solani, present in PR 94-82 and CNPA-PRECOCE 2 cotton cultivars, is individually determined by one dominant gene; and in 'PR 94-215', resistance is determined by the presence of two dominant genes of complementary epistatic effect.…”

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confidence: 99%