J Syst Evol ›› 2013, Vol. 51 ›› Issue (4): 461-467.DOI: 10.1111/j.1759-6831.2012.00242.x

• Research Articles • Previous Articles     Next Articles

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

1,2,3Fan LIU§ 3Xiao‐lin ZHANG§ 1,2Qing‐feng WANG 4Hui LIU 5Guang‐Xi WANG 1,2Wei Li*   

  1. 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(Institute of Hydroecology, Ministry of Water Resources & Chinese Academy of Sciences, Wuhan 430079, China)
    5(Laboratory of Plant Conservation Science, Faculty of Agriculture, Meijo University, Aichi 468-8502, Japan)
  • Received:2012-08-30 Published:2013-03-19

Abstract: 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. ×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. ×intortifolius 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. ×intortifolius was more able to adapt to limiting environments than one or both of its two parental taxa.

Key words: Potamogeton ×intortifolius, P. perfoliatus, P. wrightii, resource allocation, tradeoffs.