中文摘要：

以水培豌豆（Pisum sativum）品种‘陇碗一号’幼苗为材料,以硝普钠（SNP）为一氧化氮（NO）供体,研究外源NO对缺铁豌豆幼苗的生长及光合作用的影响。结果显示：0.6 mmol.L-1的外源SNP所产生的NO能够促进缺铁豌豆幼苗的生长,并促进叶绿素的合成,增强净光合速率（Pn）、气孔导度（Gs）和蒸腾速率（Tr）,而使胞间CO2浓度（Ci）下降;同时,叶绿素荧光最大光化学量子产量（Fv/Fm）、实际光化学量子效率（Yield）和光化学淬灭系数（qP）均升高,在一定程度上缓解缺铁对豌豆幼苗叶片PSII反应中心的影响。外源NO对正常铁（100μmol.L-1Fe）处理下豌豆幼苗的生长和光合作用具有一定的抑制作用。研究表明,缺铁和正常铁处理的豌豆幼苗对NO的敏感性不同,适宜浓度的NO对缺铁下豌豆幼苗的生长和光合都具有一定的改善作用。

英文摘要：

The effects of nitric oxide（NO） on the growth and photosynthetic characteristics of pea seedlings under iron-deficiency stress were investigated.The results showed that NO which derived from 0.6 mmol·L-1 exogenous sodium nitroprusside（SNP） could not only increase their chlorophyll content,photosynthetic rate,stomatal conductance and transpiration rate,but raise their chlorophyll Fv/Fm,Yield,qP,while reduce their intercellular carbon dioxide concentration in pea seedling under iron-deficiency stress.As a result,appropriate NO can prevent the injury of iron-deficiency stress on PSⅡ and protect the photosynthetic activities of pea seedlings.However,the different effects had been found in 100 μmol·L-1 Fe seedlings treated with the same concentration SNP.These results indicate the different demands on the dose of nitric oxide for plants under 0 μmol·L-1 Fe and 100 μmol·L-1 Fe treatments and appropriate concentration of nitric oxide can ameliorate pea growth and photosynthesis stress caused by iron-deficiency.