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Synopsis: Temperature treatments ranging from –1 to 21° C. were imposed for 24 hours on Russian wild-rye plants during anther emergence. An inverse relationship resulted between treatment temperature and the time required for embryo initiation. Various temperature-related floral injuries were observed. Most of the freezing injury occurred in the anthers, while the principal warm temperature injury was to the pistillar tissue. The warm temperature effects were exaggerated when followed by a warm greenhouse environment.
2 Former graduate student, now Range Conservationist, Rocky Mountain Forest and Range Experiment Station, USFS, with headquarters at Fort Collins, Colorado, in cooperation with Colorado State University, and stationed at Flagstaff, Arizona, in cooperation with Arizona State College.
Received for publication March 30, 1964.
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