HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Luedders, V. D. Search for Related Content PubMed Articles by Luedders, V. D. Agricola Articles by Luedders, V. D.

Genes for Resistance to Soybean Cyst Nematode Populations

Dep. of Agronomy, Univ. of MO, Columbia 65211

^* Corresponding author.

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 F₂ 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.

Received for publication February 8, 1988.