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Oxalis debilis in China: distribution of flower morphs, sterile pollen and polyploidy.

Abstract

BACKGROUND AND AIMS

Oxalis 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.

METHODS

Field 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 CONCLUSIONS

Populations 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.

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  • Authors+Show Affiliations

    ,

    South China Botanical Garden, The Chinese Academy of Sciences, Guangzhou 510650, China.

    ,

    Source

    Annals of botany 98:2 2006 Aug pg 459-64

    MeSH

    Angiosperms
    China
    Chromosomes, Plant
    Flowers
    Microscopy, Electron, Scanning
    Plant Infertility
    Pollen
    Polyploidy
    Reproduction
    Seeds

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    16735406