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Effect of Honeybees on Crossing Percentage and Pod-Set in Guar¹

The effect of honeybees (Apis mellifera L.) on crossing percentage and pod set in guar [Cyamopsis tetragonoloba (L.) Taub.] was studied by comparing crossing blocks caged with and without bees and open-field crossing. Crossing was increased threefold in the block with honeybees, compared to the open-field and absence-of-bees crossing blocks. Maximum detected crossing using the glabrouspubescent marker was 13.3%. Pod set in open-field and with-bees crossing blocks was significantly higher than where bees were excluded; however, seeds per pod was greatest where bees were excluded. Cultivars differed significantly in pods per plant, seeds per pod, and amount of cross pollination.

Key Words: Cage • Outcrossing • Glabrous-pubescent • Cultivar • Native bees • Pollinator • Breeding line • Crossing block • Apis mellifera L. • Cyamopsis tetragonoloba (L.) Taub.

² Research geneticist, USDA-ARS, Texas A&M Univ. Agric. Res. and Ext. Ctr., P.O. Box 1658, Vernon, TX 76384.

Received for publication January 11, 1982.