The Effect of Temperature on the Inheritance of Pod Numbers in Pisum sativum L.1

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Abstract
Lines of peas which produce predominantly single, double, and triple pods, respectively, at each peduncle were crossed and growth of the parental lines and the F1, F2 and backcross progenies was compared at 2 temperature regimes—45° night-6O° day and 60° night-75° day—in the growth chamber. The single-and double-podded parental lines were extremely uniform, producing almost 100% single and double pods, respectively, at both temperature regimes. The triple-podded parent produced almost all 3-podded determinant peduncles at the lower temperature but tended to produce indeterminant peduncles with 2, 3, and 4 pods at the higher temperature. The F1 of all crosses produced almost all double pods at both temperatures. The mean numbers of pods per peduncle produced on the F2 plants was somewhat higher at the high than at the low temperature. The F2 and backcross generation plants segregated as they would for a character which is dependent on several genes but for which genes for 2 pods per peduncle showed some dominance. These results contrast with field studies where pod number was extremely variable for all lines and where genes for low pod number appeared to be somewhat dominant.

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