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Cross-Compatibility of Birdsfoot Trefoil, Lotus corniculatus L.¹

All possible crosses, including reciprocals, were made among four clones of birdsfoot trefoil, Lotus comiculatus L. Objectives were to determine cross-compatibilities of the clones, to detect reciprocal effects, to study some components of seed yield and determine effect of different dates on crossing. Reciprocal differences were noted for number of pods, number of seed, and percentage successful crosses. Crosses were made on three dates to determine effect of varying day lengths on seed yield and related characters. In mid-winter, successful crosses were difficult to make and seed yields were poor. Diallel analyses disclosed that seed weight and percentage successful crosses were influenced by general combining ability effects. No specific combining ability effects were noted. Differences in cross-compatibility were found.

Key Words: Self-incompatibility • Seed yields • Yield components

² Research Agronomist, Crops Research Division, ARS, USDA, Blacksburg, Va. 24061.

Received for publication June 3, 1968.