外源一氧化氮对NaCl胁迫下番茄幼苗叶绿素荧光特性的影响

Effect of exogenous nitric oxide on chlorophyll fluorescence characteristics in tomato seedlings under NaCl stress

    摘要
  • 摘要: 通过水培试验, 研究了外源NO供体硝普钠(SNP)处理对100 mmol·L-1 NaCl胁迫下番茄幼苗叶绿 素荧光特性的影响。结果表明, 外源NO提高了盐胁迫下番茄幼苗叶片的最大荧光(Fm)、PSⅡ最大光化学效率(Fv/Fm)、PSⅡ潜在活性(Fv/Fo)、表观光合电子传递速率(ETR)、实际光化学效率(ΦPSⅡ)、光化学荧光猝灭系数(qP)和光化学速率(Prate), 降低了初始荧光(Fo)、非光化学荧光猝灭系数(qN)、天线热耗散速率(Drate)和PSⅡ激发能压力(1-qP), 同时降低了激发能在两个光系统间的分配不平衡性。表明外源NO通过减少过剩激发能的耗散, 提高光合电子传递效率, 可有效缓解盐胁迫对番茄PSⅡ系统的伤害, 进而在缓解盐胁迫中发挥重要作用。

     

    Abstract: Hydroponic experiment was conducted to investigate the effect of sodium nitroprusside (SNP, an exogenous nitric oxide donor) on chlorophyll fluorescence characteristics in tomato seedlings under 100 mmol·L-1 NaCl stress. The results show that SNP increase maximum fluorescence (Fm), photochemical efficiency of photosystem II (Fv/Fm), potential photochemical efficiency (Fv/Fo), electron transport rate (ETR), actual photochemical efficiency (ΦPSⅡ), photochemical quenching coefficient (qP) and photochemical efficiency (Prate). However, SNP decreases minimal fluorescence (Fo), non-photochemical quenching coefficient (qN), antenna heat dissipation rate (Drate), excitation pressure (1-qP) and the deviation from full balance between PSⅠand PSⅡ(β/α-1) in tomato seedlings under NaCl stress. This then suggests that nitric oxide reduces excess excitation dissipation, improves photochemical electron transport efficiency and efficiently protects tomato leaf from PSⅡdamage under salt stress.

     

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