摘要
在100 mmol/L NaCl胁迫下,研究了外源一氧化氮供体硝普钠(SNP)处理对番茄幼苗光合作用和离子含量的影响。结果表明,外源一氧化氮能使在NaCl胁迫下的番茄幼苗叶片叶绿素含量、净光合速率(Pn)、气孔导度(Gs)、叶绿素荧光参数Fv/Fo和Fv/Fm显著提高,胞间CO2浓度(Ci)明显下降;番茄幼苗根系、叶片中K+、Ca2+和Mg2+含量均显著提高,Na+含量明显降低。表明外源一氧化氮可以减轻盐胁迫对番茄幼苗叶片光合功能的不利影响,缓解NaCl胁迫对番茄幼苗的抑制作用。
The effects of sodium nitroprusside （SNP, an exogenous nitric oxide donor） on photosynthesis and ionic contents in tomato （ Lycopersicon esculentum Mill. ） seedlings were investigated under 100 mmol/L NaCl stress. The results showed that under NaCl stress, chlorophyll contents, net photosynthetic rate （Pn）, stomatal conductance （Gs）, chlorophyll fluorescence parameters Fv/Fm and Fv/Fo were significantly increased, but intercellular CO2 concentration （Ci） was obviously decreased by exogenous nitric oxide. At the same time, contents of K^＋, Ca^2＋ and Mg^2＋ in dry weight of root and leaves were markedly increased, but contents of Na^＋ were significantly decreased by exogenous nitric oxide. The above results indicated that exogenous nitric oxide donor （SNP） could alleviate the unfavorable effects of NaCl stress on photosynthesis; delay the inhibition of tomato seedlings by NaCl stress.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2007年第4期658-663,共6页
Journal of Plant Nutrition and Fertilizers
基金
教育部高校博士点基金项目(20030307020)
江苏省科技厅项目(BC2003306
BE2002304)资助
