An analysis of compatibility relationships with respect to successful capsule set on hand-pollination under normal field conditions was conducted using 18 monopodial orchid genotypes comprising of monogeneric and bigeneric hybrids. The monogenerics included three members of the genus Arachnis and five members of Vanda and the bigenerics were composed of seven members of Aranda and three Aranthera types. Intercrossing in all the 324 (18x18) possible combinations was done (including selfs) for analyzing the compatibility between genotypes based on post pollination floral changes in successful as well as unsuccessful combinations, stages of capsule development /stages at which pollinated flowers abscised, percentage of capsule set, percentage of capsules with germinating seeds, and percentage of filled seeds over total seeds.Capsules at seed inoculation maturity (80-90% maturity) were successfully harvested from 67 out of the 324 possible combinations. These 67 combinations included 61 crosses and 6 selfs. The pollinated flowers/ immature capsules from the 257 unsuccessful combinations fell off at different stages of development from immediately after pollination to just before capsule harvest depending on the relative intensity of incompatibility expressed.
C Lekha Rani、V P Udaya
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Department of Plant Breeding & Genetics, College of Agriculture, Vel/ayani-695 522, Thiruvananthapuram, Kerala, India
NSTL
