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Oxalis debilis in China: distribution of flower morphs, sterile pollen and polyploidy.
BACKGROUND AND AIMSOxalis debilis is a South American tristylous species that is currently naturalizing in China. Based on field observations and herbarium data a report is made on its pollination, morph frequencies, pollen viability, seed set and chromosome number. In addition, a new chromosome count for the species in Africa is provided.
METHODSField observations were conducted in six provinces in south-east China. Flower visitors were recorded and nectar sugar was measured with a refractometer. The species' compatibility system was determined by carrying out experimental self- and cross-pollinations on bagged inflorescences. Stigma receptivity and pollen viability was determined using the MTT test.
KEY RESULTS AND CONCLUSIONSPopulations of O. debilis in China contain either the mid-style-length morph or the short morph, but not both. Pollination is by nectar- and pollen-foraging bees; pollen viability is low; and seed set in natural and experimentally self- or cross-pollinated flowers is extremely low. Chromosome counts indicate that O. debilis contains diploid and tetraploid forms in its native as well as introduced range, which does not support a previous hypothesis that the predominant vegetative reproduction in this species is an escape from pentaploidy.
South China Botanical Garden, The Chinese Academy of Sciences, Guangzhou 510650, China.,
Annals of botany 98:2 2006 Aug pg 459-64
Microscopy, Electron, Scanning
Pub Type(s)Journal Article
Research Support, Non-U.S. Gov't