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Analysis of Genetic Variability from Generations of Plant‐Progeny Lines in Soybeans 1
Author(s) -
Hanson W. D.,
Weber C. R.
Publication year - 1962
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/cropsci1962.0011183x000200010021x
Subject(s) - geneticist , agricultural experiment station , library science , biology , citation , crop , microbiology and biotechnology , genealogy , operations research , genetics , agriculture , history , mathematics , computer science , agronomy , ecology
FREQUENTLY in plant breeding programs with selfpollinated plants, lines have been evaluated from a series of selfed generations. The variability structure considered would be a sequence of generations which have been evaluated as single plant-progenies from a randomly selected plant within each line. Generations and years are confounded. Horner and Weber (8) generalized the genetic variances and covariances for such data. However, even though one assumes a negligible genotype by environment interaction, the analysis is difficult to interpret since the estimate of a genetic variance may vary considerably between years. A partition of genetic variability depends upon the magnitude of the variance estimates, and one must conclude that a partition could reflect the expansion and contraction of the measurement scales rather than the true genetic partition. However, reliable estimates of genetic variance may be available from such data. An objective of this paper was to generalize the variance structure for such data and to evaluate and interpret the data from the F a through Fr generations from a soybean cross, Adams X Hawkeye. The generalized variance structure would have utility for analyzing data from other self-pollinated crops and for predicting genetic progress. Partitioning of genetic variability into additive and nonadditive genetic variances contributes basic information necessary for the proper evaluation of selection procedures. Fisher (2) and Fisher et al. (3) derived several genotypic variances and covariances for early generations of a selffertilized population. These were described and extended by Mather (11). Homer et al. (7) derived an expression for the set of variances and covariances for a self-fertilized population. The genetic parameters in these studies were defined with reference to the F2 population. Hanson and Weber (4) considered the resolution of genetic variability with reference to the population of homozygous lines generated by a segregating population which will serve as the basis for partitioning in this paper. However, the genetic parameters defined by this method are directly commutable