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INHERITANCE OF CELLULAR MEMBRANE THERMOSTABILITY AND AGRONOMIC CHARACTERS IN TWO SOYBEAN POPULATIONS
Abstract
Information was needed that would aid the breeder in deciding on the most efficient selection and breeding methods to be used for the improvement of cellular membrane thermostability (percent heat injury) in soybeans {Glycine max (L.) Merrill}. The objectives of this study were (1) to determine the importance of the additive, dominance and epistatic genetic effects in the control of cellular membrane thermostability and agronomic characters and (2) to investigate the effectiveness of selecting for increased cellular membrane thermostability in early generations. The parents used to generate the populations were chosen because of their contrasting membrane thermostability. 'Williams' was crossed to 'Beeson' (Population 1) and 'Harcor' was crossed to 'Bonus' (Population 2). Each population consisted of the P(,1), P(,2), F(,1), F(,2), B(,1) and B(,2) generations in 1980. In 1981, the selfed generations of the 1980 experiment were evaluated: P(,1), P(,2), F(,2), F(,3), B(,1)S and B(,2)S.(,) Generation mean analyses of 1980 plant data and 1981 family data from Population 2 revealed that 99% of the genetic variation for percent heat injury was attributable to the additive genetic effect in both years. In Population 1, significant genetic variation among generations (56%) was attributed to the additive genetic effect for percent heat injury in 1980 and to the additive (96%) and dominance (3%) effects in 1981. Frequency distributions indicated that percent heat injury was quantitatively inherited in both populations and that a major gene(s) was influencing the expression of the trait in Population 1. The preponderance of additive gene action found controlling percent heat injury indicates that either pure line selection after hybridization or recurrent selection would be effective methods of breeding for increased membrane thermostability in these populations. Ineffectiveness of early generation selection for decreased percent heat injury was indicated in Population 1. In Population 2, 5% and 11% (as percent of mean) gains from selection for decreased percent heat injury were noted for actual (F(,2) plant) and predicted (F(,3) family) gains, respectively, indicating effectiveness of selection in this population.
Subject Area
Genetics
Recommended Citation
POLLAK, GEORGE MICHAEL, "INHERITANCE OF CELLULAR MEMBRANE THERMOSTABILITY AND AGRONOMIC CHARACTERS IN TWO SOYBEAN POPULATIONS" (1983). ETD collection for University of Nebraska-Lincoln. AAI8404842.
https://digitalcommons.unl.edu/dissertations/AAI8404842