Effects of water stress on chlorophyll fluorescence in leaves of plum(Prunus salicina Lindl.)

The effects of water stress on the chlorophyll fluorescence parameters of the plum were studied by using plant efficiency analyser (PEA). The results indicate that chlorophyll fluorescence parameters of leaf are changed obviously under water stress. Fo is increased; Fm, Fv, Fv/Fm, Fv/Fo, Fm/Fo and the area between the curves of Fo and Fm are decreased, suggesting that the primary light energy conversion of PSⅡ，the potential activities of PSⅡ，the potential photosynthetic activities, photosynthetic electron transport, etc. have been inhibited under water stress. The chlorophyll content, relative water content of plum leaves decrease under water stress. And the characteristics against water stress of three plums varieties are discussed.