Self-incompatibility in the Commelinaceae
1981; Oxford University Press; Volume: 47; Issue: 5 Linguagem: Inglês
10.1093/oxfordjournals.aob.a086054
ISSN1095-8290
Autores Tópico(s)Plant Diversity and Evolution
ResumoThis paper reports on a survey of self-incompatibility in 110 species of 22 genera in the family Commelinaceae. Genera from both tribes, Tradescantieae and Commelineae are included. Fifty-five species were found to be self-incompatible, 50 species self-compatible, and five species comprised individuals which were self-incompatible and individuals which were self-compatible. This variability and its possible evolutionary significance are discussed. Self-incompatible species had actinomorphic flowers and the majority of these were in the Tradescantieae. Species with zygomorphic flowers which were more commonly found in the Commelineae were self-compatible. The ubiquitous presence of binucleate pollen grains supports previous data that self-incompatibility is of the gametophytic type. The site of pollen tube arrest, however, was on the stigma at or near the base of the stigma papilla cells. There were two exceptions to this viz. an unnamed Dichorisandra species and Siderasis fuscata where pollen tube arrest was stylar. The significance of these data to taxonomy also receives comment.
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