Abstract
The effect of environment on selling behavior and on female sterility in genetic male sterile barley was investigated at 46 (Bozeman, MT) and 61 (Elimäki, Finland) degrees north latitude. These field studies were conducted for 2 years with eight different male sterile stocks. Less selfing occurred under bags (male fertility) at Elimäki (0.02%) than at Bozeman (6.9%); the reduction was attributed to the longer photoperiod during spike development. Plants set more seed under bags in 1976 (9.2%) than in 1977 (3.2%) at Bozeman, probably because temperatures were higher in 1977 than in 1976 during the critical awn initials stage of spike development. Five male sterile mutants evaluated for selfing differed significantly in seed set at Bozeman. The three sterile stocks evaluated for female fertility showed significantly more female sterility than comparable fertile seed parents. Female fertility was significantly higher at Bozeman than at Elimäki, and it was higher in 1977 than in 1976 at Bozeman.
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