Inheritance pattern and selection criteria for resistance to soybean cyst nematode races 3 and 9

Pesquisa Agropecuária Brasileira

Gerardo Domingo Lucio Cervigni²  Ivan Schuster¹  Carlos Sigueyuki Sediyama¹  Everaldo Gonçalves De Barros¹  Maurilio Alves Moreira¹ 

[1] ,Universidade Federal de Viçosa Instituto de Biotecnologia Aplicada à Agropecuária Viçosa MG ,Brazil

关键词: Glycine max;    Heterodera glycines;    resistance;    SCN;    recombinant inbred lines;    Glycine max;    Heterodera glycines;    resistência;    NCS;    linhagens endogâmicas recombinantes;   

DOI  :  10.1590/S0100-204X2007001000007

来源: SciELO

【 摘 要 】

The objective of this work was to determine soybean resistance inheritance to Heterodera glycines Ichinohe (soybean cyst nematode - SCN) races 3 and 9, as well as to evaluate the efficiency of direct and indirect selection in a soybean population of 112 recombinant inbred lines (RIL) derived from the resistant cultivar Hartwig. The experiment was conducted in a completely randomized design, in Londrina, PR, Brazil. The estimated narrow-sense heritabilities for resistance to races 3 and 9 were 80.67 and 77.97%. The genetic correlation coefficient (r g = 0.17; p<0.01) shows that some genetic components of resistance to these two races are inherited together. The greatest genetic gain by indirect selection was obtained to race 9, selecting to race 3 due to simpler inheritance of resistance to race 9 and not because these two races share common resistance genes. The resistance of cultivar Hartwig to races 3 and 9 is determined by 4 and 2 genes, respectively. One of these genes confers resistance to both races, explaining a fraction of the significant genetic correlation found between resistance to these SCN races. The inheritance pattern described indicates that selection for resistance to SCN must be performed for each race individually.

【 授权许可】

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