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作 者 ：吴雪霞1;2;朱为民2;朱月林1;陈建林2

期 刊 ：植物营养与肥料学报 2007年 13卷 6期 页码：1105-1109

关键词：一氧化氮；NaCl胁迫；番茄；光合特性；

Keywords:nitric oxide, NaCl stress, tomato, photosynthetic characteristics,

摘 要 ：在100.mmol/L.NaCl胁迫下,研究了外源NO供体硝普钠(SNP)处理对番茄(Lycos.641.2..persicon.esculentum.Mill.)幼苗光合作用光响应曲线、CO₂响应曲线等光合特性的影响。结果表明,在NaCl胁迫下,外源NO显著提高了番茄幼苗叶片净光合速率(Pn)、蒸腾速率(Tr)和气孔导度(Gs),降低了胞间CO₂浓度(Ci);显著提高了光饱和点(LSP)、光饱和光合速率、表观量子效率(AQY)、CO₂饱和点(CSP)、羧化效率(CE)、RuBP最大再生速率;显著降低了光补偿点(LCP)、CO₂补偿点(CCP);同时提高了叶片叶绿素含量。以上结果表明,外源NO能改善番茄幼苗NaCl胁迫下的光合作用,从而增强植株的耐盐性。

Abstract:The effects of sodium nitropprusside(SNP,an exogenous nitric oxide donor) on photosynthesis-light response curve and CO₂ response curve in seedlings of tomato(Lycopersicon esculentum Mill.)were investigated under 100 mmol/L NaCl stress condition.The results showed that net photosynthetic rate(Pn),transpiration rate(Tr) and stomatal conductance(Gs) were significantly increased,intercellular CO₂ concentration(Ci) were markedly decreased,light saturation point(LSP),photosynthetic rate at light saturation point,apparent quantum yield(AQY),CO₂ saturation point(CSP),carboxylation efficiency(CE) and maximum RuBP regeneration rate were markedly increased,light compensation point(LCP),CO₂ compensation point(CCP) were significantly decreased by the treatment of exogenous nitric oxide under NaCl stress.In addition,the chlorophyll contents were significantly enhanced.The above results indicated that exogenous nitric oxide donor(SNP) could improve photosynthesis of tomato seedlings under NaCl stress and increase salt tolerance of plants.

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