Effects of epiphyton on chlorophyll fluorescence parameters of crisp pondweed Potamogeton crispus in winter
ZHOU Yan-feng1，2, WANG Chen-he2, ZHAO Kai3, XU Dong-po1,2
1.Scientific Observing and Experimental Station of Fishery Resources and Environment in the Lower Reaches of the Changjiang River, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences， Wuxi 214081, China; 2.Wuxi Fisheries College, Nanjing Agriculture University, Wuxi 214081, China; 3.College of Resource and Environment, Anqing Normal University, Anqing 246011, China
Abstract: Changes in chlorophyll fluorescence parameters were in situ measured on surface of leaf and stem in crisp pondweed Potamogetoncrispus, as wide distribution and growing in winter submerged macrophyte, exposed to epiphyton and removal of the epiphyton on January 14-19, 2016 to evaluate the impact of epiphyton on photosynthesis of crisp pondweed under low temperature environment. It was found that the maximum photon quantum yield (Fv/Fm) was significantly decreased on the treated leaves after the removal of attachments compared with the untreated leaves(P<0.05). However, the relative electron transfer rate (rETR) was decreased only on the first day with the increase in photosynthetic radiation, and decrease in the value of rETR was observed only on the first day, and gradually recovered from the second day of the experiment to same level in the control group (P>0.05). The findings indicate that crisp pondweed has very rapid adaptability of epiphyton removal, especially the shading effect of periphyton being a kind of protection to the photoinhibition of crisp pondweed in low temperature environment.
2019, Vol. 34 
