Reproductive Responses to Increased Shoot Density and Global Change Drivers in a Widespread Clonal Wetland Species, Schoenoplectus americanus
Reproductive Responses to Increased Shoot Density and Global Change Drivers in a Widespread Clonal Wetland Species, Schoenoplectus americanus
复制标题
DOI：
10.1007/s12237-023-01249-z
复制
发表时间：
2023-09
影响因子：
2.7
通讯作者：
Aoi Kudoh;J. Megonigal;J. A. Langley;G. Noyce;Toshiyuki Sakai;D. Whigham
中科院分区：
文献类型：
--
作者：
Aoi Kudoh;J. Megonigal;J. A. Langley;G. Noyce;Toshiyuki Sakai;D. Whigham
许多湿地物种的扩张是克隆繁殖和有性繁殖共同作用的结果。通过克隆繁殖产生的分株使植物能够移动并占据亲本分株附近的空间，而通过有性繁殖产生的种子使物种能够分散并在远离父母的开阔或受干扰的地点定居。克隆繁殖和有性繁殖之间的平衡随着植物密度的变化而变化，但很少有研究关注繁殖分配随着密度的变化而变化，以响应全球气候变化。美洲梭子虫是北美广泛分布的克隆湿地物种，也是切萨皮克湾半咸水潮汐湿地的优势物种。对美洲斑潜蝇对全球变化的响应的长期实验为比较不同处理下的两种繁殖模式提供了机会。种子产量随着枝条密度的增加而增加，这支持了导致克隆繁殖增加的因素(如更高的枝条密度)刺激有性生殖和基因扩散的假说。有性繁殖拨款的增加主要是由于开花的分株数量增加，而不是每生殖枝种子数量的增加，也不是每花序产生的花数与发育成种子的花数之间的比率的增加。种子产量随着温度的升高而增加，而随着二氧化碳或氮素的增加而减少或没有变化。这项比较研究的结果表明，植物对全球变化处理的反应会影响资源分配，并可能改变物种产生种子的能力。
The expansion of many wetland species is a function of both clonal propagation and sexual reproduction. The production of ramets through clonal propagation enables plants to move and occupy space near parent ramets, while seeds produced by sexual reproduction enable species to disperse and colonize open or disturbed sites both near and far from parents. The balance between clonal propagation and sexual reproduction is known to vary with plant density but few studies have focused on reproductive allocation with density changes in response to global climate change.Schoenoplectus americanusis a widespread clonal wetland species in North America and a dominant species in Chesapeake Bay brackish tidal wetlands. Long-term experiments on responses ofS.americanusto global change provided the opportunity to compare the two modes of propagation under different treatments. Seed production increased with increasing shoot density, supporting the hypothesis that factors causing increased clonal reproduction (e.g., higher shoot density) stimulate sexual reproduction and dispersal of genets. The increase in allocation to sexual reproduction was mainly the result of an increase in the number of ramets that flowered and not an increase in the number of seeds per reproductive shoot, or the ratio between the number of flowers produced per inflorescence and the number of flowers that developed into seeds. Seed production increased in response to increasing temperatures and decreased or did not change in response to increased CO2or nitrogen. Results from this comparative study demonstrate that plant responses to global change treatments affect resource allocation and can alter the ability of species to produce seeds.