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What ecological factors favor the shift from distyly to homostyly? A study from the perspective of reproductive assurance

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Journal of Plant Ecology 2018年第4期11卷 645-655页

作者： Xian-Feng Jiang Xing-Fu Zhu Ling-Ling Chen Qing-Jun Li Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303China University of Chinese Academy of Sciences Beijing 10049China Laboratory of Ecology and Evolutionary Biology State Key Laboratory in Conservation and Utilization of Bioresources in YunnanYunnan UniversityKunmingYunnan 650091China

Aims Distyly is one of the most widespread floral polymorphisms pro-moting *** transition from obligate cross-fertilized distyly to predominantly self-fertilized homostyly is frequently documented in various ***,empirical stud-ies concerning the ecological factors connected with this transition are still *** chungensis,suggested to be evolving from distyly to homostyly,provides an ideal model for the study of the ecological factors concerned with this *** study ***-gensis to understand if autonomous self-fertilization would provide reproductive assurance for the self-fertilized homo-styled morph in the *** the incompatibility features of *** were tested with hand-pollination *** compared the capacity of autonomous self-fertilization between the distylous and homo-styled morph of *** in the field by excluding the pollinators with *** addition,the degrees of herkogamy of some *** plants were between the short-styled and homo-styled *** plants were studied to understand whether they were able to obtain greater reproductive assurance when the herkogamy in the flowers was *** Findings All three morphs of *** were highly self-and intra-morph *** degree of herkogamy positively correlated with the capacity for autonomous self-fertilization.A negative correlation between the degree of herkogamy and the magnitude of pollen limitation was found,but no significant correlation was found between the degree of herkogamy and the contribution of cross-fertilization to overall *** study suggests that reducing the degree of herkogamy can significantly increase the reproductive assurance for a self-compatible *** results provided evidence that the homo-styled morph of *** had the highest capacity for autonomous self-fertilization and the highest seed production in the field,because autonomous self-f

关键词： autonomous self-fertilization dimorphic incompatibility distyly homostyly Primula chungensis reciprocal herkogamy reproductive assurance

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