Approach Crossing of Oats (Avena SPP.)1

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Abstract
The approach crossing technique has been used successfully in making oat crosses at Texas A&M University since 1962. Seed set above 60% has been obtained consistently with this method. Approach crosses between field‐grown and greenhouse‐grown plants were made by cutting the stems of the field‐grown male parent and placing the panicles in water. The detached panicles shed pollen normally for 8 to 10 days, and 74% and 71% seed set were obtained on the female parents in 1966 and 1967, respectively. In 1966, some florets were deliberately damaged to determine the effect of mutilation on seed set. Removing the palea or glumes did not appreciably reduce seed set, but seed set was reduced when the pistil was completely exposed by removing the glumes, lemma, and palea.

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