Photosynthetic performance of Cladophora fascicularis during its dehydration and rehydration

Abstract

Abstract: By the method of chlorophyll fluorescence measurement,this paper studied the photosynthetic performance of Cladophora fascicularis(Chlorophyta)during its sustained dehydration and rehydration.The results showed that after taken out from water and exposed to air,the water content in C.fascicularis cells decreased quickly,with about 90% water loss after 2.5 h.After 1.5 h dehydration,the maximal quantum yield of photosynthesis(F_v/F_m) and the maximal relative electron transport rate(P_m) only decreased by 10% and 11%,respectively,and after 2.5 h dehydration,both of them decreased by about half of their initial values.During dehydration,the light intensity responding to half maximal photosynthetic rate(I_k) decreased,while the initial rate α had a slight increase at the beginning,followed by a decrease.After 0.5 h rehydration,both F_v/F_m and P_m recovered quickly.Dehydration could reduce photosynthetic quantum yield significantly,with photosynthetic apparatus not damaged irreversibly,which made the photosynthetic activity quickly recover after rehydration.This character should be helpful to C.fascicularis to adapt the water stress in intertidal zone.

Key words: Biomarkers, Lysosomes, Stress protein, Mettllothioneins

CLC Number:

Q945.11

HAN Zhiguo, HE Lijing, GU Jiguang, XU Zhongneng, HAN Boping. Photosynthetic performance of Cladophora fascicularis during its dehydration and rehydration[J]. cje, 2005, (11): 1291-1294.

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