不同浓度氯化钠胁迫对万寿菊幼苗生长及生理特性的影响

Effect of Different Concentration of NaCl Stress on the Growth and Some Physiological Characteristics of Tagetes erecta Seedlings

以盆栽万寿菊幼苗为试材,研究了不同浓度的NaCl胁迫对万寿菊幼苗生长及部分生理特性的影响。结果表明:0.20%NaCl胁迫对万寿菊幼苗生长及生理特性有促进作用;浓度≥0.40%的NaCl处理对万寿菊幼苗的生长有明显的抑制作用,并且随着浓度的增大,抑制作用增强,株高及生物量净增长量、叶绿素含量急剧降低,MDA含量明显增高。由此可以认为,0.40%NaCl浓度是万寿菊幼苗受到胁迫伤害的阈值;NaCl胁迫下叶片中脯氨酸含量、SOD活性、CAT活性和POD活性显著增高,说明万寿菊幼苗通过增加渗透调节物质和保护酶活性等方式来适应NaCl的胁迫。

Taking the seedlings of Tagetes erecta as test material, the effect of different concentration of NaC1 stress on the growth,and some physiological characteristics of Tagetes erecta were studied. The results showed that 0. 20% NaC1 had a promoting effect on the growth and development of treated plants. When the concentration of NaC1 equal to or more than 0. 40 %, the growth of treated plants were inhibited. Moreover,as the concentration of NaCI solutions increased, the inhibition was strengthened. Height growth, net biomass growth,as well as chlorophyll content were markedly decreased; At the same time,MDA content markedly increased. It was possible that the concentration of NaC1 0. 40% was the key value of NaCI stress. Under the NaC1 stress,the contents of proline and the activities of SOD activity,CAT activity and POD activity increased,the difference of treated plants and control was significant. It was suggested that Tagete.s erecta seedlings adapted to salt stress by changing osmoregulation and increasing enzyme activity and so on.