Effects of NaCl Stress on Chlorophyll Fluorescence Parameters and Excitation Energy Dissipation in Leaves of Eggplant Seedlings

Effects of NaCl stress on chlorophyll fluorescence parameters of eggplant seedlings were investigated.The results indicated that with increasing NaCl concentration,maximum fluorescence(Fm),photochemical maximum efficiency of PSII(Fv/Fm),potential photochemical efficiency(Fv/Fo),actual photochemical efficiency of PSII(ФPSII),efficiency of excitation captured by open PSII centers(Fv'/Fm'),photochemical quenching coefficient(qP) and the electron transport rate(ETR) were decreased,minimal fluorescence(Fo),nonphotochemical quenching coefficient(NPQ) and high excitation pressure(1-qP) were increased;The fraction of absorbed light in photochemistry(P) were decreased,the fraction of antenna heat dissipation(D) were increased,while excess energy (E) changed unstable,antenna heat dissipation(D) was the main way for excessive energy dissipation.These results showed reaction center of PSII was damaged and pathway of photosynthetic electron transport was inhibited in eggplant seedlings under NaCl stress.