入侵植物酢浆草在中国的花型分布特点及自花授粉.PDF
入侵植物酢浆草在中国的花型分布特点及自花授粉
植物分类学报 46 (6): 847–855 (2008) doi: 10.3724/SP.J.1002.2008.08076 Journal of Systematics and Evolution (formerly Acta Phytotaxonomica Sinica) 入侵植物酢浆草在中国的花型分布特点及自花授粉 罗世孝 李世晋 张奠湘* ( 中国科学院华南植物园 广州 510650) Floral morph distribution in China and autogamy of an invasive species: Oxalis corniculata (Oxalidaceae) * Shi-Xiao LUO Shi-Jin LI Dian-Xiang ZHANG (South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China) Abstract The floral morphs of an invasive herb, Oxalis corniculata, were surveyed based on the examination of herbarium specimens deposited in IBSC, and field observation on living individuals in 24 natural populations in China. The floral phenology, pollen-ovule ratio (P/O) and floral visitors of O. corniculata were investigated and determined. Assisted pollination experiments were carried out to examine the breeding system of O. corniculata. Scanning electron microscope (SEM) and fluorescence microscope (FM) were employed to examine pollen germination and the growth of pollen tubes. The species is composed of three floral morphs in China, viz., the long-styled morph, the semi-homostyled morph, and the quasi-homostyled morph. The semi-homostyled morph is common in disturbed urban and ruderal habitats, whereas only one long-styled population was found in less disturbed habitats of Pinus forests in Anning County, Yunnan Province, although two specimens (in IBSC) of long-styled individuals collected from a same locality in Guangdong Province were also recorded. The flowering period of O. corniculata was from Feb
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