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Genes for Resistance to Soybean Cyst Nematode Populations
Author(s) -
Luedders V. D.
Publication year - 1989
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1989.0011183x002900020004x
Subject(s) - soybean cyst nematode , biology , heterodera , gene , genetics , nematode , phenotype , glycine , genetic linkage , inbred strain , cyst , botany , amino acid , medicine , ecology , radiology
Relatively few soybean ( Glycine max (L.) Merr.) lines have been reported to be resistant to soybean cyst nematode (CN, Heterodera glycines Ichinohe) populations and races. The criterion for resistance was relatively few cysts per plant, a phenotype of the cyst nematode‐soybean association determined by genes of both organisms. Thus the frequencies of nematode genes for avirulence influenced the phenotypes observed. The vast majority of lines are considered to be susceptible to CN, implying that they have no genes for resistance. The objective was to show that some CN susceptible soybean lines do have genes for resistance to some CN. Previously developed CN inbreds were further inbred by transferring single cysts for several CN generations. Artificial selection among inbreds resulted in fewer cysts on specific susceptible soybean lines, apparently due to increased frequencies of some CN genes for avirulence. Twelve susceptible soybean lines apparently have genes for resistance to specific CN inbreds since relatively few cysts per plant were observed. Crosses involving six of these lines produced continuous distributions of numbers of cysts on F 2 plants, indicating the segregation of at least two genes for CN resistance in each cross. The possible genetic similarities of some of these lines and some CN resistant lines are discussed, including the potential linkage effects of CN genes for avirulence on the different phenotypes.