Nonrandom mating inDiscaria americana (Rhamnaceae) |
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Authors: | Diego Medan Viviana Vasellati |
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Institution: | (1) Cátedra de Botánica, Facultad de Agronomía de la U.B.A., Avda. San Martín 4453, RA-1417 Buenos Aires, Argentina |
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Abstract: | Nonrandom mating takes place when seed paternity differs from that produced by random success of available pollen. To test if some form of this phenomenon operates in the self-incompatible perennialDiscaria americana, we performed one-donor hand pollinations involving seven individuals, and measured pollen-tube performance and seed viability and germination. A significant level of heterogeneity in reproductive traits was present in our sample. Mating was nonrandom as a consequence of complete self-incompatibility (intrafloral and geitonogamous pollinations were unsuccessful) linked with partial cross-compatibility (some inter-individual pollinations consistently failed to produce offspring while other parental combinations were fecund). Pollen tubes of successful pollen parents exhibited higher growth rate than those of infecund ones. Stylar-ovarian inhibition of incompatible pollen tubes and a wet stigma type suggests that a gametophytic incompatibility system operates in the species. |
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Keywords: | Rhamnaceae Discaria Nonrandom mating pollen reproductive biology |
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