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The stt3a-1 stt3b-1 Double Mutant Is Lethal at the Gamete Stage.
The pollen and siliques produced from self-pollination of C24 wild-type (STT3a STT3b), stt3a-1 (stt3a-1 STT3b), and stt3a-1/+ stt3b-1/+ heter- ozygous plants were analyzed by light microscopy. Abnormal pollen found in stt3a-1/+ stt3b-1/+ pollen are indicated by closed arrowheads. Aborted ovules that failed to develop normally are labeled with open arrowheads. Bars = 0.025, 3, and 1 mm from top to bottom.
