Diversity of Reproductive Phenology Among Subtropical Grasses Is Constrained by Evolution and Climatic Niche
Diversity of Reproductive Phenology Among Subtropical Grasses Is Constrained by Evolution and Climatic Niche
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DOI：
10.3389/fevo.2020.00181
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
Kangxin Li;Jinying Wang;Lu Qiao;Ruyi Zheng;Yiqun Ma;Yuan-Hua Chen;Xiaobo Hou;Yanjun Du;J. Gao;Hui Liu
中科院分区：
文献类型：
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作者：
Kangxin Li;Jinying Wang;Lu Qiao;Ruyi Zheng;Yiqun Ma;Yuan-Hua Chen;Xiaobo Hou;Yanjun Du;J. Gao;Hui Liu
生殖物候对气候变化敏感，与物种功能类型、分布范围及其相应的气候生态位有关。生殖物候的系统发育生态位保守性也限制了其多样性和物种的分布。因此，我们评估了光合作用途径、生活史、系统发育和气候生态位对生殖物候的影响。我们收集了分布于亚热带的中国禾本科植物的开花始期和繁殖期、功能型(光合作用途径和生活史)以及全球分布的18个气候变量的数据，并利用系统发育模型确定了它们的关联性。我们在开花时发现了较强的系统发育信号，但在繁殖期没有发现。光合作用途径和生活史对开花和繁殖期都有显著的互作效应，C3一年生禾草开花最早，繁殖期最长。我们发现，气候生态位较宽的物种开花较早，繁殖期较长。具体地说，年平均降雨量和最冷月温度范围较大的物种开花较早，年平均温度较高和最湿季降水量范围较大的物种繁殖期较长。研究发现，亚热带牧草生殖物候的多样性受到进化和气候生态位的制约，光合作用途径和生活史对繁殖的时间和持续时间有交互作用。
Reproductive phenology is sensitive to climatic changes and is associated with species functional types, distribution ranges, and their corresponding climatic niches. Phylogenetic niche conservatism in reproductive phenology also constrains its diversity and the distribution of species. Therefore, we assessed the effects of photosynthetic pathway, life history, phylogeny, and climatic niche on reproductive phenology. For 190 Poaceae species in subtropical China, we compiled data on flowering onset and reproductive period, functional type (photosynthetic pathway and life history), and 18 climatic variables across the species’ global distributions and used phylogenetic models to determine associations. We found strong phylogenetic signals in flowering onset but not in reproductive period. Photosynthetic pathway and life history have significant interactive effects on both flowering onset and reproductive period, such that C3 annual grasses flowered the earliest and had the longest reproductive period. We found that species with wider climatic niches would flower earlier and have longer reproductive periods. Specifically, species that experience wider ranges of mean annual precipitation and coldest-month temperatures would flower earlier, and species with higher mean annual temperature and wider ranges of wettest-quarter precipitation have a longer reproductive period. This study finds that the diversity of reproductive phenology among subtropical grasses is constrained by evolution and climatic niche and that photosynthetic pathway and life history have an interactive effect on the timing and the duration of reproduction.