Abstract
SynopsisHigh night temperature arrested the normal development of Poa annua anthers without noticeably damaging the pistillate organs when plants with emerging panicles were transferred to a glasshouse with controlled night temperature. Pistillate panicles emerged 11 to 19 days after initiation of a treatment characterized by 29° C. maximum day temperature and 20° C. minimum night temperature. Following controlled pollination, approximately 96% of 274 seeds resulted in definite F1 hybrids in this naturally self‐pollinated species.
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