Open AccessEvolution of disease resistance and quantitative characters in barley Composite Cross II: Independent or correlated?
Author(s) -
MUONA OUTI,
ALLARD R. W.,
WEBSTER R. K.
Publication year - 1984
Publication title -
hereditas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 50
eISSN - 1601-5223
pISSN - 0018-0661
DOI - 10.1111/j.1601-5223.1984.tb00910.x
Subject(s) - biology , hordeum vulgare , selection (genetic algorithm) , resistance (ecology) , plant disease resistance , hordeum , population , poaceae , agronomy , botany , genetics , demography , gene , artificial intelligence , sociology , computer science
MUONA, O., ALLARD, R. W. and WEBSTER, R. K. 1984. Evolution of disease resistance and quantitative characters in barley Composite Cross II: Independent or correlated?— Hereditas 101: 143–148. Lund, Sweden. ISSN 0018–0661. Associations between quantitative characters and disease resistance were studied in barley Composite Cross II. This population, which was started in 1929 from intercrosses among 28 varieties of barley (Hordeum vulgare L.), has been grown annually at Davis, California without conscious selection. Stored seed from the various years offer opportunities for studying evolutionary changes. Random progenies from generations F23 and F45 were measured for seven quantitative characters and classified for resistance to four races of Rhynchosporium secalis (Oud.) Davis, the causative agent of barley scald. The data were analyzed for associations between the two groups of characters. In the F23, resistant plants differed from susceptible ones in heading date and height, but no such differences were observed in the F45. We also studied whether selection operating on any one character could have brought about, as correlated responses, changes in characters in the other group. We found that the observed changes cannot be accounted for by such selection. Rather, natural selection acted independently on disease resistance and quantitative characters.