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盐分胁迫下两个苋菜品种对镉及主要渗透调节物质累积的差异

徐智敏1,2,何宝燕1,2**,李取生1,2,雷永康1,2,梅秀芹1,2,曹刚1,2,周丽珍1,2,陈艳芳1,2   

  1. (1暨南大学环境学院, 广州 510632; 2水土环境毒害性污染物防治与生物修复广东省高校重点实验室, 广州 510632)
  • 出版日期:2015-02-07 发布日期:2015-02-07

Differences between two amaranth cultivars in accumulations of Cd and main osmotic adjustment substances under salt stress.

XU Zhi-min1,2,  HE Bao-yan1,2**, LI Qu-sheng1,2,  LEI Yong-kang1,2, MEI Xiu-qin1,2, CAO Gang1,2, ZHOU Li-zhen1,2, CHEN Yan-fang1,2   

  1. (1 School of Environment, Jinan University, Guangzhou 510632, China; 2 Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation, Department of Education of Guangdong Province, Guangzhou 510632, China)
  • Online:2015-02-07 Published:2015-02-07

摘要: 采用重金属Cd平均含量为2.28 mg·kg-1的污灌菜园土,在外源NaCl处理下进行盆栽试验,研究花红圆叶苋菜(BRLA)和红柳叶苋菜(ARW)对Cd及主要渗透调节物质吸收和积累的品种间差异。结果显示:随盐胁迫增强,两品种根、叶Cd和Na+含量较对照显著增加(P<0.05),且品种ARW的Cd累积量高于品种BRLA。与ARW相比,BRLA根可贮存更多的Na+以减少向叶转运,在0.4%盐处理时BRLA叶K+/Na+比值降幅为39.2%,而ARW达56.9%。盐分促进BRLA根、叶Mg2+含量增加,而ARW根Mg2+则低于对照。盐胁迫后,两品种根、叶脯氨酸含量显著高于对照(P<0.05),且BRLA表现较强的脯氨酸合成能力。两品种根、叶总游离氨基酸与可溶性蛋白含量随盐胁迫强度增大呈相反的变化。盐分促进了两品种根部可溶性糖积累。综上,BRLA比ARW具有较低Cd累积性,表现较好的耐盐性,具备较强的渗透响应能力,可为筛选和培育既耐盐又低累积Cd的农作物提供科学参考。

关键词: 蒙古黄芪, 产地适宜性, 资源调查

Abstract: A pot experiment was conducted in sewageirrigated garden soil (2.28 mg·kg-1 Cd) pretreated with different concentrations of NaCl. The differences between two amaranth cultivars (BRLA and ARW) in accumulations of Cd and main osmotic adjustment substances under salt stress were investigated. Under salt stress, the contents of Cd and Na+ in roots and leaves of cultivars BRLA and ARW significantly increased compared with the control (P<0.05), and the Cd content was obviously higher in ARW than in BRLA. BRLA had stronger Na+ retention capacity in roots than ARW, decreasing the transportation of Na+ from root to leaf. In 0.4% NaCl treatment, the K+/Na+ ratio decreased by 39.2% in leaves of BRLA, and by 56.9% in leaves of ARW. Mg2+ content increased in roots and leaves of BRLA and decreased in roots of ARW. More proline accumulated in roots and leaves of both cultivars under salt stress compared with the control (P<0.05) and BRLA exhibited greater proline synthetic ability than ARW. Contents of soluble protein and free amino acids in roots and leaves of both cultivars decreased with the increase of soil salinity, while soluble sugar in roots of both cultivars increased with the increase of soil salinity. These results suggested that BRLA had lower Cd uptake, higher salt tolerance and stronger osmotic adjustment ability than ARW. Our study provided some useful information for screening and breeding of salt tolerant cultivars with low Cd accumulation.

Key words: Astragalus membranaceus var mongholicus, resource survey, suitability of origin