壳寡糖、一氧化氮和植物激素在烟草气孔运动中的作用及其相互关系

Role and Relationship of Oligochitosan,NO and Phytohormones in Stomatal Movement of Tobacco (Nicotiana tabacum L.cv.Samsun NN)

本文研究了壳寡糖(COS)、一氧化氮(NO)和植物激素对烟草气孔运动的作用及其相互关系,结果表明,COS、NO、脱落酸(ABA)能诱导烟草气孔开度减小;ABA合成抑制剂钨酸钠(Na2WO4)和NO合成酶抑制剂L-NAME具有清除COS、ABA或NO诱导烟草气孔开度减小的作用。说明COS通过诱导ABA和NO产生,进而诱导烟草气孔开度减小,而且ABA和NO之间有相互作用。另外,细胞分裂素和生长素能够诱导烟草气孔开度增大,也能够逆转COS诱导的气孔开度减小。

Oligosaccharide,an elicitor,could induce plant resistance against biotic and abiotic stress.Oligochitosan （COS）,as well as NO or ABA,could induce stomatal opening reduction in leaves of tobacco （Nicotiana tabacum cv.Samsun NN） seedlings;but Na2WO4,an inhibitor of ABA could scavenge the effect of reduction in stomatal opening,and so could L-NAME （a nitric oxide synthase inhibitor）.The results showed that NO and ABA could be induced by COS,and there was cross-talk between NO and ABA.In addition,cytokinin and auxin could induce increase in stomatal opening of leaves of tobacco seedlings,and reverse the function of COS that induced reduction in stomatal opening of leaves of tobacco seedlings.