Pollination biology and breeding system of Acacia senegal |
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Authors: | RAJESH TANDON K. R. SHIVANNA H. Y. MOHAN RAM |
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Affiliation: | Department of Botany, University of Delhi, Delhi 110 007, India;Department of Environmental Biology, University of Delhi, Delhi 110 007, India Received May 1999;accepted for publication June 2000 |
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Abstract: | Phenology, pollination biology and breeding system were investigated in three populations of Acacia senegal located in Delhi and Rajasthan. Flowers emit a mild fragrance and produce a minute quantity of nectar. The stigma is wet non-papillate, cup-shaped and generally accommodates one polyad with 16 pollen grains. The style is solid. The mass effect created by the brush type of blossoms attracts a wide variety of insects, of which the giant Asian honeybee, Apis dorsata , is the effective pollinator. Manual in vivo pollination studies have shown that the species is self-incompatible. Self-incompatibility appears to operate inside the embryo sac. Under natural conditions fruit set is as low as 0.36%. Insufficient pollination is the main cause of low fruit set. Manual xenogamous pollinations substantially improve fruit set to 30% |
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Keywords: | entomophily geitonogamy gum arabic phenology self incompatibility |
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