Main role of self-pollination rate on reproductive allocations in pseudogamous apomicts |
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Authors: | M. Noirot D. Couvet S. Hamon |
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Affiliation: | (1) Laboratoire de Resources Génétiques et d’Amélioration des Plantes Tropicales, Orstom, BP 5045, 34032 Montpellier Cedex 1, France, FR;(2) Institut d’Ecologie, UPMC, 4 Place Jussieu, 75252 Paris Cedex 05, France, FR |
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Abstract: | Most apomicts are hermaphroditic and pseudogamous (pollination is necessary to trigger parthenogenesis). In these plants, fitness depends on the number of progeny obtained by maternal reproduction. We determined the evolutionary stable strategy for male and female sex allocation. We show that the efficiency of pollination determines male and female resource allocations. Predictions are made of these allocations, of pollen/ovule ratio and of seed-set. We show that self-compatibility in apomicts is necessary for the maintenance of an apomictic population, and thus can account for the association between the loss of self-incompatibility and pseudogamous apomixis. In contrast to sexuals, male investment in pseudogamous apomicts increases with the rate of self-pollination. Received: 15 June 1996 / Accepted: 20 September 1996 |
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Keywords: | Pollination Apomixis Pollen/ovule ratio Seed-set Resource allocation |
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