Premium
Reproductive Advantage Associated with Resistance to Soybean‐Cyst Nematode 1
Author(s) -
Luedders V. D.,
Duclos L. A.
Publication year - 1978
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/cropsci1978.0011183x001800050034x
Subject(s) - soybean cyst nematode , heterodera , cultivar , biology , nematode , agronomy , yield (engineering) , nematology , glycine , horticulture , ecology , materials science , metallurgy , biochemistry , amino acid
Cultivars of soybeans [ Glycine max (L.) Merr.] resistant (R) and susceptible (S) to the soybean‐cyst nematode ( Heterodera glycines Ichinohe) were grown separately and together on plots heavily infested with the nematodes and on noninfested plots. Two‐cultivar (R and S) mixtures in three maturity groups were grown at three densities for 3 years; each cultivar was also grown in pure stand. The mixtures of equal numbers of R and S seeds were made each year. The reproductive advantage of the R cultivar (i.e., the ratio between yield of R cultivar and yield of S cultivar) was always higher in the mixtures than in the pure stands and higher on infested than on noninfested soil. Since the selective advantage of the R cultivars was higher on soybean‐cyst nematode infested land, growing segregating populations for several generations on heavily infested land should increase the frequency of R plants. In such populations, segregation would also increase the frequency of R plants when some genes conditioning resistance were recessive, as in race 3 resistance.