Interference of genotypes x environments interaction in the genetic control of resistance to Asian rust soybean

Pesquisa Agropecuária Brasileira

Aliny Simony Ribeiro²  José Francisco Ferraz De Toledo¹  Magno Antonio Patto Ramalho² 

[1] ,Universidade Federal de Lavras Departamento de Biologia Lavras MG ,Brazil

关键词: Glycine max;    Phakopsora pachyrhizi;    general combining ability;    specific combining ability;    Glycine max;    Phakopsora pachyrhizi;    capacidade geral de combinação;    capacidade específica de combinação;   

DOI  :  10.1590/S0100-204X2009000900014

来源: SciELO

【 摘 要 】

The objectives of this work were to identify parents resistant to Asian soybean rust using diallel crosses, obtain information on the genetic control of soybean resistance to the pathogen and verify whether the combining ability estimates interact with the environment (year or time of assessment). The F1 generation was obtained in a greenhouse from crosses between five contrasting parents for the trait resistance to soybean rust, in a complete diallel without reciprocals. Two rust-severity assessments were carried out on individual soybean plants of 25 treatments (parents and F2 and F3 populations) in 2006/2007 and 2007/2008, in an experimental field at Embrapa Soja, Londrina, PR, Brazil. Additive effects predominated in the genetic control of soybean resistance to Asian rust, and the interaction of the segregant populations with the environment, although significant, did not alter the genetic parameter's general combining ability (GCA) and specific combining ability estimates, indicating that estimates obtained in one year and one assessment can be extrapolated to others. BR01-18437 inbred line is resistant to Asian rust and showed high GCA effects. This line should be used as parent if the objective is the resistance to Phakopsora pachyrhizi.

【 授权许可】

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