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生态学杂志 ›› 2005, Vol. ›› Issue (9): 1048-1052.

• 研究报告 • 上一篇    下一篇

铬胁迫下不同品种玉米种子和幼苗的反应及其与铬积累的关系

周希琴, 吉前华   

  1. 肇庆学院生物学系, 肇庆, 526061
  • 收稿日期:2005-04-28 修回日期:2005-06-02 出版日期:2005-09-10
  • 通讯作者: 周希琴,女,1962年生,讲师.主要从事植物生理学方面研究,发表论文10篇.
  • 基金资助:
    肇庆市科技创新基金资助项目(2005003)

Responses of maize seed and seedlings to chromium stress and their relation to chromium accumulation

ZHOU Xiqin, JI Qianhua   

  1. Biology Departent of Zhaoqin College, Zhaoqin 526061, China
  • Received:2005-04-28 Revised:2005-06-02 Online:2005-09-10

摘要: 研究了铬胁迫对玉米(6个品种)种子萌发初期一些生理生态特征的影响,及各种生理指标与幼苗铬积累量间的关系,结果表明,随铬处理浓度的加大而玉米种子萌发率逐渐降低,幼苗株高、根长、鲜物质量和干物质量均逐渐降低;脯氨酸、吸收铬量、可溶性蛋白质、超氧负离子、丙二醛含量逐渐上升,超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性则逐渐增加,根系活力和硝酸还原酶活性在不同品种玉米中差异较大;所有供试玉米品种中,丙二醛含量、CAT和SOD活性与幼苗铬积累量之间存在显著或极显著的正相关关系。不同玉米品种对Cr3+毒害的反应表现不同,存在品种间差异。

关键词: 黄土丘陵区, 土壤水分, 空间异质性, 控制因子, 剖面变化, 时间变化

Abstract: The effects of CrCl3 stress with different concentrations on some earlier physiological and ecological responses of seed germination,and correlation between physiological index and the contents of Cr3+ absorption of Zea mays were studied.The results showed that seed germination rate,plant height,root length,fresh weight and dry biomass of seedlings gradually decreased with increasing CrCl3 concentrations.While not only the contents of proline,soluble protein,chromium and malonaldehydic acid (MDA) increased,but the activity of superoxide dismutase (SOD),peroxidese (POD) and catalase (CAT)increased gradually.But the diffrence of root vigor and activity of nitrate reductase (NR) evidently varied among different variety.The positive correlation between Cr3+ content and MDA contents,SOD and CAT activity was significant at the 0.01 level or 0.05 level.In a word,different Zea mays variety tend to have different responses to Cr3+ toxicity,there are differences among variety.

Key words: Loess Plateau, Soil moisture content, Spatial he terogeneity, Dominant controls, Profile pattern, Temporal dynamics

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