以茄子幼苗为试材,研究了不同浓度NaCl胁迫下叶绿素荧光参数的变化.结果表明:随着NaCl胁迫加剧,最大荧光(Fm)、PSII最大光化学效率(Fv/Fm)、PSII潜在活性(Fv/Fo)、PSII实际光化学效率(ФPSII)、天线转化效率(Fv＇/Fm＇)、光化学荧光猝灭系数(qP)和电子传递速率(ETR)均表现出降低的趋势,初始荧光(Fo)、非光化学荧光猝灭系数(NPQ)和PSⅡ激发能压力(1-qP)均上升;光化学反应的能量(P)在叶片所吸收的光能中所占的比例也逐渐减少,天线色素耗散的能量(D)表现出和P相反的趋势,非光化学反应耗散的能量(E)变化不稳定,天线热耗散是耗散过剩能量的主要途径.表明NaCl胁迫下,茄子幼苗光系统反应中心受到损伤,光合电子传递过程受到抑制.
Effects of NaCl stress on chlorophyll fluorescence parameters of eggplant seedlings were investigated.The results indicated that with increasing NaCl concentration,maximumfluorescence (Fm),photochemical maximum efficiency of PSII (Fv/ Fm),potential photochemical efficiency (Fv/ Fo),actual photochemical efficiencyof PSII (Ф PSII),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),non2photochemical 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 wayfor excessive energy dissipation.These results showed reaction center of PSIIwas damaged and pathway of photosynthetic electron transport was inhibited in eggplant seedlings under NaCl stress.
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