棉花耐盐性及抗氧化性研究进展.PDFVIP

生物技术通报 ·综述与专论 · B IO TECHN OLO G Y　BULL E T IN 2009年第 6 期 棉花耐盐性及抗氧化性研究进展 李向前 　王艳 　张富春 (新疆大学生命科学与技术学院 新疆生物资源基因工程重点实验室 ,乌鲁木齐 830046) ( ) 　　摘 　要 : 　棉花 Gossyp um h irsu tum L 具有一定的耐盐能力 ,但盐分过量会对棉花造成离子毒害 、渗透胁迫和氧化危害 。 棉花能够通过调控 N a+ /H + 反向转运蛋白将盐离子排出胞质或区隔在液泡内, 以减轻离子毒害 ;还能通过调节渗透相关基因 合成脯氨酸 、甜菜碱等小分子物质及 L EA 保护蛋白来进行渗透保护调节 。棉花通过抗坏血酸 谷胱甘肽循环途径及提高体内 超氧化物歧化酶 、谷胱甘肽还原酶等的活性 ,清除活性氧物质 。总结了棉花在耐盐和抗氧化机制方面的研究结果 ,探讨了棉 花耐盐和抗氧化机制之间的相互关系 , 为提高棉花抗性水平的研究提供理论依据 。 关键词 : 　棉花 　耐盐性 　抗氧化性 　抗性基因 Research Progress of Sa lt Tolerance and An tiox ida tion of Cotton L i X iangqian　W ang Yan　Zhang Fuchun (X inj iang Key L abora tory of B iolog ica l R esou rces and Genetic E ng ineering , College of L if e S cience and Technology X inj iang Un iversity, U rum qi 830046) 　　Ab s tra c t: 　The cotton wh ich ha s been p laced in the moderate salttoleran t group of p lant sp ecie s, ha s lim ited salt to lerance, bu t when the salt concentration wa s beyond the end of endu rance , cotton wou ld be dam aged by ion toxicity, o smotic stress and oxidative stress However, cotton ha s a serie s of strategy to respon se or m itigate the effect ofN aCl under salt stress, the exp ression of genes relat ed to the ion balance, o smoregu lation and antioxidation were actived or up regu lated There were m any correlation between the m echa n ism of salt to lerance and an tioxidation wh ich m ay share the sam e signal p athway, ABA and som e other regu latorSom e sub stances w ith doub le re sistance to salt and oxidative stre ss shou ld be further studied Studie s on the m echan ism s of cotton ( Gossyp um h i