摘要
通过水培试验,研究了外源NO供体硝普钠(SNP)处理对100mmol·L-1NaCl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。
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.
出处
《中国生态农业学报》
CAS
CSCD
北大核心
2009年第4期746-751,共6页
Chinese Journal of Eco-Agriculture
基金
上海科技兴农重点攻关项目[沪农科攻字(2006)第2-1号]资助
关键词
一氧化氮NaCl胁迫
番茄幼苗
叶绿素荧光特性
光系统II
Nitric oxide, NaCl stress, Tomato seedling, Chlorophyll fluorescence characteristics, Photosystem Ⅱ