当前位置:
X-MOL 学术
›
J. Trop. Ecol.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Evaluating the fitness effects of seed size and maternal tree size on Polylepis tomentella (Rosaceae) seed germination and seedling performance
Journal of Tropical Ecology ( IF 1.4 ) Pub Date : 2020-06-30 , DOI: 10.1017/s0266467420000061 Alejandra I. Domic , José M. Capriles , Gerardo R. Camilo
Journal of Tropical Ecology ( IF 1.4 ) Pub Date : 2020-06-30 , DOI: 10.1017/s0266467420000061 Alejandra I. Domic , José M. Capriles , Gerardo R. Camilo
In vascular plants, larger seeds are generally associated with higher germination potential, healthier seedlings and overall higher rates of survivorship. How this relationship holds or what other physiological tradeoffs evolved in plants adapted to high-altitude environments, such as the tropical and subtropical highland Polylepis tree, remain unclear. In this study, we evaluated the relationship between seed mass and seedling performance by testing the reserve effect, the metabolic effect, and the seedling-size effect hypotheses in Polylepis tomentella Weddell (Rosaceae). Since the relationship between fitness and seed size can often depend on maternal plant size, we additionally investigated the association between germination success, seedling performance (survival, relative growth rate (RGR) and height), and size of bearing-seed trees under controlled greenhouse conditions. Our results showed that heavier seeds are more likely to germinate, but we did not find evidence that could support the reserve effect, metabolic effect or seedling-size effect. As seedlings from larger and medium seeds exhibited comparatively similar RGR, survival percentages and final size, maternal plant size was positively associated with improved seed quality and seedling performance. These results demonstrate that seed mass and maternal size during early seedling establishment are critical for Polylepis persistence, demography and conservation.
中文翻译:
评估种子大小和母树大小对毛豆(蔷薇科)种子萌发和幼苗性能的适应性影响
在维管植物中,较大的种子通常与较高的发芽潜力、较健康的幼苗和较高的总体存活率有关。这种关系如何保持或在适应高海拔环境(例如热带和亚热带高地)的植物中进化出哪些其他生理权衡多鳞鱼 树,还不清楚。在这项研究中,我们通过测试储备效应、代谢效应和幼苗大小效应假设来评估种子质量和幼苗性能之间的关系。毛鳞鱼 威德尔(蔷薇科)。由于适合度和种子大小之间的关系通常取决于母株大小,我们还研究了发芽成功率、幼苗性能(存活率、相对生长率 (RGR) 和高度)以及受控温室下种子树大小之间的关系状况。我们的研究结果表明,较重的种子更有可能发芽,但我们没有找到支持储备效应、代谢效应或幼苗大小效应的证据。由于来自较大和中等种子的幼苗表现出相对相似的 RGR、存活百分比和最终大小,母株大小与种子质量和幼苗性能的提高呈正相关。这些结果表明,早期幼苗建立期间的种子质量和母体大小对于多鳞鱼 持久性,人口和保护。
更新日期:2020-06-30
中文翻译:
评估种子大小和母树大小对毛豆(蔷薇科)种子萌发和幼苗性能的适应性影响
在维管植物中,较大的种子通常与较高的发芽潜力、较健康的幼苗和较高的总体存活率有关。这种关系如何保持或在适应高海拔环境(例如热带和亚热带高地)的植物中进化出哪些其他生理权衡