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Patterns and drivers of plant sexual systems in the dry-hot valley region of southwestern China

Plant Diversity 2024年第2期46卷 158-168页

作者： Rong Ma Qi Xu Yongqian Gao Deli Peng Hang Sun Bo Song State Key Laboratory of Plant Diversity and Specialty Crops/Yunnan Key Laboratory for Integrative Conservation of Plant Species with Extremely Small Populations Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China College of Life Sciences Shaanxi Normal UniversityXi'an 710119China Yunnan Forestry Technological College Kunming 650224China School of Life Science/Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment Yunnan Normal UniversityKunming 650500YunnanChina

Sexual systems play important roles in angiosperm evolution and exhibit substantial variations among different floras. Thus, studying their evolution in a whole flora is crucial for understanding the formation and maintenance of plant biodiversity and predicting its responses to environmental change. In this study, we determined the patterns of plant sexual systems and their associations with geographic elements and various life-history traits in dry-hot valley region of southwestern China, an extremely vulnerable ecosystem. Of the 3166 angiosperm species recorded in this area, 74.5% were hermaphroditic,13.5% were monoecious and 12% were dioecious, showing a high incidence of diclinous species. Diclinous species were strongly associated with tropical elements, whereas hermaphroditic species were strongly associated with temperate and cosmopolitan elements. We also found that hermaphroditism was strongly associated with showy floral displays, specialist entomophily, dry fruits and herbaceous *** was strongly associated with inconspicuous, pale-colored flowers, generalist entomophily, fleshy fruits, and woody plants, whereas monoecy was strongly associated with inconspicuous, pale-colored flowers, anemophily, dry fruits, and herbaceous plants. In addition, hermaphroditic species with generalist entomophily tended to flower in the dry season, whereas diclinous species with specialist entomophily tended to flower in the rainy season. However, independent of sexual systems, plants that produce dry fruits tended to flower in the rainy season and set fruits in the dry season, but the opposite pattern was found for fleshy fruit-producing plants. Our results suggest that in the dry-hot valleys, plant sexual systems are associated with geographic elements as well as various life-history traits that are sensitive to environmental change.

关键词： Floral traits fruit type Growth form Pollination system Reproductive phenology

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Patterns of plant sexual systems in subtropical evergreen broad-leaved forests in Ailao Mountains, SW China

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Journal of Plant Ecology 2008年第3期1卷 179-185页

作者： Xin-Sheng Chen Qing-JunLi Xishuangbanna Tropical Botanical Garden Chinese Academy of SciencesMengla CountyYunnan 666303China Graduate University of Chinese Academy of Sciences Beijing 100039China

Aims Sexual systems influence many components of the ecology and evolution of plant populations and have rarely been documented in subtropical evergreen broad-leaved forests(SEBLF).Here we report frequency distribution and ecological correlates of plant sexual systems in SEBLF at Ailao Mountains,and compare our results with that of tropical and cool temperate *** We examine the sexual systems of 703 species of woody angiosperms belonging to 103 families and 296 genera based on a comprehensive survey of SEBLF at Ailao Mountains Natural *** of plant sexual systems and ecological traits were mainly based on published literatures and specimens as well as our field *** associations between plant sexual system and ecological traits were assessed with chi-square *** findings Among these species,60.2%were hermaphroditic,15.8%were monoecious and 24.0%were *** percentage of dioecious sexual system among tree species(22.2%)in SEBLF was comparable to those of tropical tree floras,but much higher than those of temperate forests at North *** percentage of monoecious sexual system among tree species(30.1%)in SEBLF was higher than that of tropical tree floras,but much lower than those of temperate forests at North *** was significantly associated with the tree growth form and was relatively common in temperate *** was significantly associated with fleshy fruits and monoecy was significantly associated with dry fruit type in *** high percentage of diclinous sexual systems(monoecy and dioecy)in SEBLF may be associated with the origin of the flora and the prevalence of relatively small inconspicuous flowers of the forests in the Oriental Region.

关键词： reproductive trait fruit type dioecy temperate forest

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