NaCl胁迫对甘肃红豆草生理特性的影响

采用盆栽试验,研究了不同浓度NaCl胁迫对甘肃红豆草幼苗株高、叶绿素含量、可溶性蛋白、可溶性糖、丙二醛、Na+和K+含量等生理指标的影响。结果表明:随着盐浓度的升高,甘肃红豆草株高降低,叶绿素a、叶绿素b和类胡萝卜素含量逐步下降。渗透调节物质中,可溶性蛋白含量先升高后降低,可溶性糖含量逐步升高,膜质过氧化产物丙二醛的含量也随NaCl浓度的增加逐步升高,幼苗各器官中Na+含量和Na+/K+均随NaCl浓度的提高而显著增加,K+含量则显著降低,不同器官中Na+/K+在相同浓度NaCl胁迫下表现为根叶。表明甘肃红豆草能通过代谢调节适应低于75mmol/L NaCl胁迫。

Effect of salt stress on physiological properties of Onobr ychis viciae f olia cv. Gansu

Plant height,chlorophyll content,soluble protein,soluble sugar,MDA and Na+ or K+ content of Onobrychis viciaefolia cv.Gansu were determined in order to get physiological indicators under different concentrations salt stress.The results showed that plant height,chlorophyll a,chlorophyll b and carotenoid contents of sainfoin gradually decreased(P<0.05) with increasing salt concentration.Soluble protein content increased and then decreased,soluble sugar content gradually increased.Lipid peroxidation product alondialdehyde content increased with increasing salt concentration.In root and leaf of seedlings,Na+ content and Na+/K+ significantly increased as salt concentration increased,while K+ content decreased.The ratio of Na+/K+in root was hiher than leaf at same NaCl concentration.The results indicated that it was no effect on physiological and biochemical properties when NaCl concentration lower than 75 mmol/L and sainfoin seedlings could adapt salt stress of certain concentration by modifing metabolic pathway.