植物学报 ›› 1999, Vol. 16 ›› Issue (04): 449-453.

• 研究报告 • 上一篇    下一篇

等渗NaCL和KCL胁迫对高梁幼苗生长和气体交换的影响

王宝山 李德全 赵士杰 孟庆伟 邹 琦   

  1. 1(山东师范大学逆境植物研究所 济南 250014) 2(山东农业大学植物科学系 泰安 271018)
  • 收稿日期:1998-03-15 修回日期:1998-04-05 出版日期:1999-07-20 发布日期:1999-07-20
  • 通讯作者: 王宝山

Effects of Iso-osmotic NaCl and KCl Stress on Growth and Gas Exchange of Sorghum Seedlings

WANG Bao-Shan, LI De-Quan, ZHAO Shi-Jie, MENG Qing-Wei and ZOU Qi   

  1. 1(Research Institute of Plant Stress, Shandong Teachers' University, Jinan 250014) 2(Department of Plant Science, Shandong Agricultural University, Taian 271018)
  • Received:1998-03-15 Revised:1998-04-05 Online:1999-07-20 Published:1999-07-20
  • Contact: WANG Bao-Shan

摘要: 本文比较研究了等渗NaCl和KCl胁迫下,高粱幼苗生长及叶片离子含量、质膜相对透性和有关气体交换参数的变化。结果表明,在低浓度NaCl和KCl胁迫7天时,高粱生长、含水量和质膜相对透性与对照相比没有明显变化,而净光合速率、蒸腾速率和气孔导度已明显下降,叶肉细胞间隙CO2浓度明显增加。NaCl胁迫下叶片Na+含量成倍增加,而K+和Ca2+含量无明显变化。KCl胁迫时叶片K+含量明显增加,Ca2+含量明显下降,而Na+含量没有明显变化。随着NaCl或KCl浓度的增加,幼苗生长和叶片含水量明显下降,质膜透性和细胞间隙CO2浓度明显增加,净光合速率、蒸腾速率和气孔导度进一步下降。 NaCl胁迫下叶片Na+含量进一步增加,K+和Ca2+进一步下降,而KCl胁迫下叶片K+含量进一步 增加,Na+和Ca2+含量进一步下降。KCl对高粱生长抑制、质膜透性、Ca2+含量下降及光合气体交换参数的影响均明显大于等渗的NaCl。

Abstract: The growth of sorghum seedings, ion contents, relative plasmalemma permeability and gas exchange of the leaves under iso-osmotic NaC1 and KC1 stress were studied. The results indicate that under the stress of low concentrations of NaCI and KC1 for 7 days, the growth of the seedings, water content and relative plasmalemma permeability of the leaves were not significantly affected compared to control plants. But the net phytosynthetic rate, transpiration rate and stomatal conductance were markedly decreased and the intercellular CO2 concentration was markedly increased. Correspondingly, the Na+ content in the leaves increased many times under NaC1 stress, but K+ and Ca2+ contents were not obviously altered. The K+ content significantly increased and the Ca2+ content significantly decreased under KCl stress, but the Na+ content was not affected. With the increase of NaCl or KC1 concentration, the growth of the seedings and the leaf water content markedly decreased, but relative plasmalemma permeability and intercellualar CO2 concentration significantly increased, and the net photosynthetic rate, transpiration rate and stomatal conductance further decreased, The Na + content in the leaves further increased, and the K+ and Ca2+ contents in the leaves decreased with the increase of NaC1 concentration. Similarly, the K+ content in the leaves further increased, and the Na+ and Ca2+ contents further decreased with the increase of KCl concentration. KCl had much more detrimental effects on the growth, plasmalemma permeability, Ca2+ metabolism and photosynthetic gas exchange of the sorghum seedings than iso-osmotic NaCl.