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Effect of Temperature Treatments on Combining Ability for Seed Set in Alfalfa¹

Five selected clones of alfalfa (Medicago sativa L.) were crossed in a diallel fashion under four temperature treatments with and without emasculation. Data for seeds per flower were analyzed to determine combining ability components and the interactions across the different temperature treatments.

General combining ability (GCA) was of more importance in determining seed set than specfic combining ability (SCA) across all temperatures. Differences in reciprocal crosses were significant at all temperatures.

Differences due to temperature or emasculation effects were larger in clones with high self- and cross-compatibility ratings than those with low ratings.

Key Words: Fertility • Pollen parents • Seed parents • Emasculation • Environmental interactions

² Former graduate student, former graduate student, Associate Professor of Experimental Statistics, and Professor of Agronomy, New Mexico State University, Las Cruces, NM 88003, respectively.

Received for publication July 10, 1973.