Abstract
The photosynthetic and fluorescence characteristics of "Hai7124"(Gossypium barbadense),"Jinhuazhongmian"(G.arboreum),"Hongxinmian"(G.herbaceum) and "Su12"(G.hirsutum) were analyzed in this paper.The results show that total chlorophyll content,leaf mass per area,Pn,PSⅡ photochemical efficiency(Fv/Fm) and photochemical quenching(qP) of the cotton cultivars are the following order: "Hai7124" "Su12" "Jinhuazhongmian" "Hongxinmian";indicating that "Hai7124" has higher photosynthetic efficiency.Further investigation shows that diurnal variation curves of Pn for "Hai7124","Jinhuazhongmian" and "Su12" have two peaks that occur at 12:00 and 16:00,though Pn for "Hongxinmian" varies and has a uni-peak curve that occurs between 12:00 ~ 14:00.This is consistent with diurnal variations in stomatal conductance(Cs).Photoinhibition of photosynthesis at noon is related with decreasing Cs and PSⅡ photochemical efficiency.
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