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草业学报 ›› 2011, Vol. 20 ›› Issue (1): 89-95.

• 研究论文 • 上一篇    下一篇

Na+在霸王适应渗透胁迫中的生理作用

蔡建一,马清,周向睿,张金林,王锁民*   

  1. 兰州大学草地农业科技学院,甘肃 兰州 730020
  • 出版日期:2011-02-22 发布日期:2011-02-22
  • 通讯作者: E-mail:smwang@lzu.edu.cn
  • 作者简介:蔡建一(1983-),男,浙江瑞安人,在读硕士。
  • 基金资助:
    863 计划(2006AA10Z126),国家自然科学基金(30770347,30671488)和新世纪优秀人才支持计划(NCET-05-0882)资助。

Physiological role of Na+ in adaption of Zygophyllum xanthoxylum to osmotic stress

CAI Jian-yi, MA Qing, ZHOU Xiang-rui, ZHANG Jin-lin, WANG Suo-min   

  1. College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China
  • Online:2011-02-22 Published:2011-02-22

摘要: 采用室内沙培实验,测定了不同强度渗透胁迫下NaCl对多浆旱生植物霸王光合作用、保护酶活性和有机渗透调节物质含量的影响,探讨了Na+在霸王抗旱方面所起的作用。结果显示,在轻度(-0.5 MPa)、中度(-1.0 MPa)和重度渗透胁迫(-1.5 MPa)下,50 mmol/L NaCl的加入显著提高了霸王幼苗的净光合速率,增强了叶片中SOD和CAT活性;霸王体内积累的可溶性糖和游离脯氨酸含量却显著降低,与未加NaCl的植株相比,在轻度、中度和重度渗透胁迫下,50 mmol/L NaCl使霸王游离脯氨酸含量分别下降了66%,55%和31%,可溶性糖含量分别下降了41%,33%和30%。由于之前的实验已表明,不同强度渗透胁迫下50 mmol/L NaCl使霸王体内的Na+含量大量升高,因此认为50 mmol/L NaCl显著提高霸王抗旱能力的原因并非是促进了植物体内有机渗透调节物质的积累,而是在于植物从外界吸收Na+并发挥Na+在植物体内的渗透调节作用。

Abstract: The effects of Na+ on the photosynthetic characteristics, protective enzyme activities and contents of organic osmotic adjustment substances in the seedlings of Zygophyllum xanthoxylum under different osmotic stresses (-0.5, -1.0 and -1.5 MPa) were measured in order to explore the significance of Na+ in the drought resistance of Z. xanthoxylum. Under different osmotic stresses, 50 mmol/L NaCl significantly increased the net photosynthetic rate and superoxide dismutase (SOD) and catalase (CAT) activities in leaves, but the soluble sugar and free proline contents decreased. The contents of free proline decreased by 66%, 55%, 31% (in -0.5, -1.0 and -1.5 MPa respectively) and contents of total sugar decreased by 41%, 33%, 30%. Since our previous experiments have shown that Na+ concentration in Z. xanthoxylum increased considerably under 50 mmol/L NaCl, it indicated that the reason why Na+ can improve the drought resistance of Z. xanthoxylum is not the promoting effect of Na+ on the accumulation of the organic osmotic adjustment substance, but the accumulation of Na+ as an osmotic adjustment substance in the plant.

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