Reproductive biology ofCaesalpinia calycina andC. pluviosa (Leguminosae) of the caatinga of north-eastern Brazil |
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| Authors: | Gwilym Lewis Peter Gibbs |
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| Institution: | (1) Royal Botanic Gardens, TW9 3AE Kew, Richmond, Surrey, UK;(2) Plant Science Laboratories, The University, Sir Harold Mitchell Building, KY16 9AL St. Andrews, Scotland, UK |
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| Abstract: | The pollination biology, breeding system and fruiting success ofCaesalpinia calycina andC. pluviosa var.sanfranciscana were studied in caatinga vegetation in Bahia, NE Brazil. The principal pollinators for both species were carpenter bees.Caesalpinia calycina is andromonoecious but inC. pluviosa all flowers are hermaphrodite. InC. calycina all selfed flowers were abscised within 72 h despite rapid self-pollen tube growth to the ovary and ovule penetration. Prevention of selfing therefore seems to be controlled by a post-zygotic mechanism. Both species had very low fruit-set and it is suggested that this is at least in part due to geitonogamous pollinations with ovule penetration by self pollen tubes. |
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| Keywords: | Leguminosae Caesalpinia Angiosperms bee-pollination andromonoecy late-acting self-incompatibility fruiting success |
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