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Evaluation of Yield Components as Selection Criteia in Barley Breeding 1
Author(s) -
Puri Y. P.,
Qualset C. O.,
Williams W. A.
Publication year - 1982
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/cropsci1982.0011183x002200050007x
Subject(s) - hordeum vulgare , yield (engineering) , biology , selection (genetic algorithm) , grain yield , path analysis (statistics) , statistics , poaceae , mathematics , agronomy , physics , artificial intelligence , computer science , thermodynamics
A combination of statistical procedures was used to determine which yield components were most likely to be effective selection criteria for yield improvement in barley ( Hordeum vulgare L.). The procedures included: 1) simple phenotypic correlations between grain yield and its endpoint components, 2) ridge regression to determine which characters were strongly interrelated, and 3) multivariate models and path analysis. Each procedure was applied in a 2‐year study of 25 near‐homozygous spring barley selections from ‘Coast’/‘Lion’//‘Winter Club’ and two check cultivars. Yield/plant (Y) was the primary measure of grain yield. Components measured were X 1 , spikes/plant; X 2 , kernels/spike; X 3 , kernel weight; and X 4 , kernel weight/spike. Two models were studied using original data and log transformed data: Y A , involving X 1 , X 2 , and X 3 , and Y B , involving X 1 and X 4 . These relate to grain yleld/plant as Y A = X 1 ‐X 2 ‐X 3 and Y B = X 1 ‐X 4 because X 4 = X 2 X‐ 3 . Phenotypic correlations gave unstable inter‐year and intercharacter relationships. X 3 and X 4 were strongly correlated with Y. Path analysis of model Y A identified X 3 and model Y B identified X 4 as having stronger direct effects on yield than other characters. X 4 , weight/spike, was judged as the primary character worthy of further investigation as a simply applied selection criterion. Results of the analyses with the log transformed data were completely consistent and practically identical with the analyses of untransformed data.