Genetic control of partial resistance to Asian soybean rust doi: 10.4025/actasciagron.v36i1.16919

The genetic control of rust resistance was studied using the Caiapônia x IAC-100 and Luziânia x Potenza crosses. The F2 and F3 generations were evaluated. Rust severity was quantified through visual assessment of the middle third of three leaflets per plant and performed by three different evaluator...

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Bibliographic Details
Published in:Acta scientiarum. Agronomy 2014-01, Vol.36 (1), p.11-17
Main Authors: Martins, Juliana Araújo Santos, Juliatti, Fernando Cezar
Format: Article
Language:English
Subjects:
dominance variance
Glycine max
heritability
Phakopsora pachyrhizi
race non-specific disease resistance
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Summary:The genetic control of rust resistance was studied using the Caiapônia x IAC-100 and Luziânia x Potenza crosses. The F2 and F3 generations were evaluated. Rust severity was quantified through visual assessment of the middle third of three leaflets per plant and performed by three different evaluators; the average score was calculated foreach individual plant. From these data, we estimated the mean and variance of the genetic components by employing the weighted least squares method. The estimated number of genes and broad- and narrow-sense heritabilities were also obtained. It was concluded that rust resistance is a characteristic controlled by 2 to 23 genes that are predominantly dominant. The estimate of narrow-sense heritability was greater than 70% for the Caiapônia x IAC-100 cross, and the wide-sense heritability was greater than 60% for the Luziânia x Potenza cross; thus, it is possible to successfully select resistant individuals in early generations.
ISSN:1679-9275
1807-8621
DOI:10.4025/actasciagron.v36i1.16919