Comparison of photosynthetic fluorescence characteristics of several submerged plants in Honghu Lake, China

Submerged plants are the pioneer species of eutrophic water remediation, and they important for maintaining health aquatic ecosystem, while light is main limiting factor growth submerged plants. In this study, we measured maximal quantum yields photosystemⅡ(Fv/Fm) rapid curves (RLCs) five dominant macrophytes in situ by using pulse-amplitude modulated fluorometer (Diving-PAM). Results revealed that P. crispus L. M. verticillatum had highest Fv/Fm value, all species’ less than 0.8. addition, variation trends Fv'/Fm' were same. All showed statistically significant differences α, α value species. And rETRm Ek basically It indicated L., both which high photosynthetic efficiency, excellent ability to withstand hard light. Compared species, resistance capacity as well faster rate, V. natans (Lour.) Hara higher low Thus, when used restoration, could be regarded a eutrophication restoration. will have better effects shallow areas.