盐胁迫对鹅耳枥生长及生理生化特性的影响

为加快鹅耳枥在园林绿化中的应用,探究了鹅耳枥对盐胁迫的响应及其耐盐性,以2年生鹅耳枥幼苗为材料,研究6个盐分梯度(0、1、2、3、4、5 g/L)NaCl胁迫对鹅耳枥幼苗生长及生理生化特性的影响。结果表明:①盐胁迫抑制了鹅耳枥的生长,随着盐质量浓度的增大,苗高生长量、地径生长量、总干质量和相对含水量均逐渐下降; ②保护酶活性、可溶性糖含量和可溶性蛋白含量随着盐胁迫程度的增加先升高后降低; ③随着盐质量浓度的增大,叶片MDA含量、相对电导率和脯氨酸含量总体呈上升趋势,且在5 g/L盐质量浓度处理下均达到最大值。研究表明,鹅耳枥幼苗在低、中等盐含量(1～3 g/L)的环境中能够正常生长,而4～5 g/L盐胁迫时对其生长会造成损害。因此,鹅耳枥具有一定的耐盐能力,可在园林绿化中推广使用。
To explore the responses of Carpinus turczaniowii to salt stress and its salt tolerance, we studied the growth, physiological and biochemical changes of two year old C. turczaninowii seedlings stressed with six gradients of NaCl concentration(0,1,2,3,4,5 g/L). The results showed: ① The growth of C. turczaninowii was inhibited by salt stress, because the height growth,diameter growth,dry weight and relative water content of seedlings decreased with the increase of NaCl concentration. ②The protective enzymes(SOD and POD)activity, soluble sugar content and soluble protein content was increased first and then decreased; ③With the increase of salt stress, MDA content, relative conductivity and proline content increased, and reached a maximum under 5 g/L NaCl. We concluded that C. turczaninowii seedings can grow under low and moderate NaCl concentration(1-3 g/L), but its growth was inhibited under 4-5 g/L NaCl. It indicated that C. turczaninowii seedlings has certain ability of salt tolerance,and they can be used widely in the landscape