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Inheritance and allelism of Russian wheat aphid resistance in several wheat lines
Author(s) -
Dong H.,
Quick J. S.,
Zhang Y.
Publication year - 1997
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.1997.tb01029.x
Subject(s) - russian wheat aphid , biology , population , genetics , gene , allele , hybrid , resistance (ecology) , infestation , aphid , aphididae , botany , pest analysis , agronomy , homoptera , demography , sociology
The Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko) has caused serious reduction in wheat production in 17 Western states of the United States since 1986. Inheritance of resistance to RWA in seven wheat lines and the allelism of the resistance genes in these lines with three known resistance genes Dn 4, Dn 5, and Dn 6 were studied. The seven resistant lines were crossed to a susceptible wheat cultivar ‘Carson’ and three resistant wheats: CORWA1 ( Dn 4), PI 294994 ( Dn 5), and PI 243781 ( Dn 6). Seedlings of the parents, F 1 , and F 2 were screened for RWA resistance in the greenhouse by artificial infestation. Seedling reactions were evaluated 21–28 days after the infestation using a 1–9 scale. The resistance level of all the F 1 hybrids was similar to that of the resistant parent, indicating dominant gene control. Only two distinctive classes were present and no intermediate types were observed in the F 2 population, suggesting qualitative, nonadditive gene action, in which the presence of any one of the dominant alleles confers complete resistance to RWA. Resistance in CI 2401 is controlled by two dominant genes. Resistance in CI 6501 and PI 94365 is governed by one dominant gene. Resistance in PI 94355 and PI 151918 may be conditioned by either one dominant gene or one dominant and one recessive gene. No conclusion can be made on how many resistance genes are in AUSVA1‐F 3 , since the parent population was not a pure line. Allelic analyses showed that one of resistance genes in CI 2401 and PI 151918 was the same allele as Dn 4, the resistance gene in CI 6501 was the same allele as Dn 6, and AUS‐VA1‐F 3 had one resistance gene which was the same allele as one of the resistance genes in PI 294994. One non‐allelic resistance gene different from the Dn 4, Dn 5, and Dn 6 genes in CI 2401, PI 94355, PI 94365, and PI 222668 was identified and should be very useful in diversifying gene sources in wheat breeding.