Delayed autonomous self-pollination in the colonizer Crotalaria micans (Fabaceae: Papilionoideae): structural and functional aspects |
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Authors: | A. V. Etcheverry J. J. Protomastro C. Westerkamp |
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Affiliation: | (1) Facultad de Ciencias Naturales, Universidad Nacional de Salta, Buenos Aires 177, 4400 Salta, Argentina;(2) Apartado Postal 37, 3370 Puerto Iguazu, Misiones, Argentina;(3) Instituto de Biologia, Universidade Federal de Uberlândia, Campus Umuarama, Uberlândia, 38400-902 Uberlândia, MG, Brazil |
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Abstract: | We investigated the reproductive biology of Crotalaria micans, a colonizing species that occurs in disturbed sites. The flowers have two whorls of stamens with differential growth and dimorphic anthers. The inner anthers serve two functions: 1) to cooperate with the stylar brush in the pollen presentation, and 2) to push the remaining pollen within the keel onto the stigma at the end of the receptivity period. Flowers pass through three phases: a) male phase, when outer anthers release their pollen, but stigmas are not receptive; b) female phase, when stigmas are receptive, but still separated from flowers' own pollen, and c) an autogamous phase, when the round anthers grow towards the stigma, leading to delayed autonomous self-pollination. Because C. micans is completely self-compatible, delayed self-pollination and geitonogamy result in approximately 76% of seeds being self-fertilized. |
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Keywords: | Crotalaria micans Link. Colonizer delayed selfing facultative xenogamy Papilionoideae pollination secondary pollen presentation |
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