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Leaf Rust Infection in Homogeneous and Heterogeneous Populations of Bread Wheat
Author(s) -
Malik B. S.,
Rao M. V.,
Yadav S. P.
Publication year - 1988
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.1439-0523.1988.tb00224.x
Subject(s) - biology , homogeneous , limiting , rust (programming language) , poaceae , agronomy , infection rate , grain yield , yield (engineering) , resistance (ecology) , veterinary medicine , botany , mathematics , surgery , mechanical engineering , medicine , materials science , combinatorics , computer science , engineering , metallurgy , programming language
Three commercial Indian wheat varieties —‘Sonalika’, ‘Kalyansona’ and ‘Janak’ were used to develop homogeneous and heterogeneous lines for leaf rust resistance, utilizing diverse sources of resistance from fourteen donors. Four kinds of multilines were developed to study coefficients o: infection, areas under disease progress curves (AUDPC), rates of spread and grain yields over their component means. Heterogeneous populations showed minimum coefficients of infection at initial as well as final stages, which were less than or equal to the resistant component even in dirty multilines carrying up to 50 % susceptible populations. Large reductions in coefficients of infection and in AUDPC were also observed. Rate of spread was independent of coefficient of infection and AUDPC. Grain yield advantage over both component means and recurrent parents was higher in clean multilines. The significance of the use of multilines in limiting losses due to disease is discussed.