The reproductive strategy of the clonal helophyte Leersia oryzoides (L.) Swartz. in response to variable submergence conditions and diferent harvest times
The reproductive strategy of the clonal helophyte Leersia oryzoides (L.) Swartz. in response to variable submergence conditions and diferent harvest times
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克隆植物 Leersia oryzoides (L.) Swartz 的繁殖策略。
DOI：
10.1007/s10682-020-10092-8
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发表时间：
2021
影响因子：
1.9
通讯作者：
Renqing Wang
中科院分区：
文献类型：
--
作者：
Tong Wang;Runyu Shao;Pengcheng Zhu;Renqing Wang
克隆植物既可以有性繁殖也可以无性繁殖。繁殖策略的选择是克隆植物进化的关键。然而，克隆水生植物在不同环境和不同收获期的繁殖策略却知之甚少。本研究对克隆水生植物稻李氏禾Leersia oryzoides（L.）斯沃茨在两种不同的淹没条件下进行了两个不同年份的试验。我们收集了有关比叶面积（SLA），生长相关的性状，在生长季节在这两年的数据。在生殖期测定了种子产量（总种子质量、种子数和种子质量）和根茎质量，分别反映有性生殖和无性生殖。随后分析了有性繁殖（总种子质量）和无性繁殖（根茎质量）之间的相关性。探讨了比叶面积与种子总质量和根茎质量的相关性。与第一年收获（H1）相比，第二年收获（H2）的种子产量（种子数量和总种子质量）下降。在饲喂处理中，在H2观察到比在H1更大的种子质量。有性生殖产量与无性生殖产量的比值在取食下增加，在H2时下降。总的来说，SLA和根茎质量之间没有显著相关性，而SLA和总种子质量之间存在显著的负相关性。根茎质量和总种子质量之间的相关性也不显著。随着时间的推移，有性生殖可能会减少，尽管进食等干扰可以促进生殖资源向有性途径的分配。叶片功能性状如SLA对有性繁殖的产量有负向预测作用，SLA与无性繁殖之间的交换可能不存在。L.不存在无性生殖与有性生殖的交换。稻虫
Clonal plants can reproduce both sexually and asexually. Selection of reproductive strategies is crucial for the evolution of clonal plants. Nevertheless, little is known about the reproductive strategy of clonal aquatic plants in diverse environments and at diferent harvest times. In this study, the reproduction of the clonal aquatic plant species Leersia oryzoides (L.) Swartz. was investigated under two diferent submergence conditions: mesic and fooding in two diferent years. We collected data concerning specifc leaf area (SLA), a growth-related trait, during the growing season in both years. Seed output (total seed mass, seed number and seed mass) and rhizome mass, which refect sexual reproduction and asexual reproduction, respectively, were measured in the reproductive period. The correlation between sexual reproduction (total seed mass) and asexual propagation (rhizome mass) was subsequently analyzed. The correlations between SLA and each reproductive output—total seed mass and rhizome mass—were explored. Seed output (the seed number and total seed mass) decreased in the second-year harvest (H2) compared to the frst-year harvest (H1). Greater seed mass was observed at H2 than at H1 in the fooding treatment. The ratio of sexual to asexual reproductive output increased under fooding and decreased at H2. Generally, the SLA and rhizome mass were not signifcantly correlated, while a signifcant negative correlation was detected between SLA and total seed mass across all observations. A nonsignifcant correlation between rhizome mass and total seed mass was also detected. A decrease in sexual reproduction can occur over time, although disturbances such as fooding can promote the allocation of reproduction resources to the sexual approach. Leaf functional traits such as SLA may negatively predict the output of sexual reproduction, and the trade-of between SLA and asexual propagation is likely nonexistent. A trade-of between asexual reproduction and sexual reproduction does not exist for L. oryzoides.