Resource allocation among sexual, clonal reproduction and vegetative growth of two Potamogeton species and their hybrid： Adaptability of the hybrid in relation to its parents  

作　　者：Fan LIU Xiao-Lin ZHANG Qing-Feng WANG Hui LIU Guang-Xi WANG Wei LI 

机构地区：[1]Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China [2]Hubei Key Laboratory of Wetland Evolution & Ecological Restoration, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China [3]Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China [4]Institate of Hydroecology, Ministry of Water Resources & Chinese Academy of Sciences, Wuhan 430079, China [5]Faculty of Agriculture, Laboratory of Plant Conservation Science, Meijo University, Aichi 468-8502, Japan

出　　处：《Journal of Systematics and Evolution》2013年第4期461-467,共7页植物分类学报（英文版）

基　　金：Acknowledgements We thank Dr. S. C. Maberly for helpful suggestions on the manuscript, Jinpu GU and Xianglong MENG for their management of the plants. This work was supported by grants from National Science and Technology Supporting Item （Grant No. 2012BAC06B04）, Strategic Pilot Science and Technology Projects of the Chinese Academy of Sciences （Grant No. XDA05090305）, the National Natural Science Foundation of China （Grant Nos. 31170340, 30970202）, Special Research Programme of the Ministry of Water Resources （Grant No. 200901009）, Open Foundation of State Key Laboratory of Freshwa- ter Ecology and Biotechnology （Grant No. 2011FB21）, and China Postdoctoral Science Foundation （Grant No. 20100471210）.

摘　　要：Resource allocation, as well as the tradeoffs among different reproductive components, plays an important role in the adaptability of plants to different environments. The hybrid may exhibit a higher adaptability in life history in heterogeneous environments because of the genetic variation derived from its parents. In this study, we exploited three levels of water depths and two types of sediments to investigate the resource allocation pattern of the first generation of the natural hybrid Potamogeton × intortifolius compared to its parents P. wrightii and P. perfoliatus. We also measured the ramet survivorship and the seed set of the hybrid P. × intortifolius. Our results showed that P. x intortifolius had higher ramet survival than its parents at 1.5-m water depth on clay sediment. The possible tradeoffs showed that in P.×intortifolius the tradeoff pattern between sexual and clonal reproduction was more pronounced in limiting environments. The individuals allocated more resources to sexual reproduction when the environment was limiting, which might confer a higher ability to utilize resources, to produce offspring and to found new populations. Although the seed set of P. xintortifolius was lower than its parents, it had a higher ability to increase its seed set when the environment was limiting （sandy sediment） than its parents, which might benefit its future survival. These results indicated that the F1 hybrid P. xintortifolius was more able to adapt to limiting environments than one or both of its two parental taxa.Resource allocation, as well as the tradeoffs among different reproductive components, plays an important role in the adaptability of plants to different environments. The hybrid may exhibit a higher adaptability in life history in heterogeneous environments because of the genetic variation derived from its parents. In this study, we exploited three levels of water depths and two types of sediments to investigate the resource allocation pattern of the first generation of the natural hybrid Potamogeton × intortifolius compared to its parents P. wrightii and P. perfoliatus. We also measured the ramet survivorship and the seed set of the hybrid P. × intortifolius. Our results showed that P. x intortifolius had higher ramet survival than its parents at 1.5-m water depth on clay sediment. The possible tradeoffs showed that in P.×intortifolius the tradeoff pattern between sexual and clonal reproduction was more pronounced in limiting environments. The individuals allocated more resources to sexual reproduction when the environment was limiting, which might confer a higher ability to utilize resources, to produce offspring and to found new populations. Although the seed set of P. xintortifolius was lower than its parents, it had a higher ability to increase its seed set when the environment was limiting （sandy sediment） than its parents, which might benefit its future survival. These results indicated that the F1 hybrid P. xintortifolius was more able to adapt to limiting environments than one or both of its two parental taxa.

关 键 词：Potamogeton ×intortifolius P. perfoliatus P. wrightii resource allocation tradeoffs. 

分 类 号：S718.3[农业科学—林学] TP393[自动化与计算机技术—计算机应用技术]