Leaf Chlorophyll Fluorescence Effect of Different Rice (Oryza sativa L.) Genotypes Under Salt Stress

摘要

In order to investigate the effect of salt stress on chlorophyll (Ch) content and fluorescence of salt-tolerate rice (Oryza sativa L.), three genotypes, V11, V12 and V13 were subjected to salinity levels of 0, 4, 8 g/pot (S0, S1, S2) for 75 days in the greenhouse pot culture. Results showed that Chl (a), Chl (a + b) of three cultivar rice both slightly increased; the initial fluorescence F_0 and maximum fluorescence F_m decreased, whereas the maximum efficiency of PSII F_v/F_m increased gradually. Electron transport rate ETR increased, and a gradual reduction of Φ_(PSII) and photochemical quenching qP was observed from S0 to S2. Non-photochemical quenching NPQ in V11 and V12 decreased slightly, whereas NPQ in V13 were the opposite. There was no significant difference between three salt treatments and rice cultivars for Chl (a), Chl (b), Chl (a + b), F_m, ETR and NPQ. Leaf chlorophyll fluorescence response of different rice genotypes under stress was different and significant difference was found in high salt stress. It suggested the salt tolerant characteristics of salt tolerant rice could be monitored from leaf chlorophyll method.