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重金属对植物吲哚乙酸合成与分解影响研究进展

张雪梅,王海娟,王宏镔*   

  1. (昆明理工大学环境科学与工程学院, 昆明 650500)
  • 出版日期:2017-04-10 发布日期:2017-04-10

Advances in biosynthesis and degradation of indoleacetic acid in plants under heavy metal stress.

ZHANG Xue-mei, WANG Hai-juan, WANG Hong-bin*#br#   

  1. (Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China).〖JP〗
  • Online:2017-04-10 Published:2017-04-10

摘要:

生长素在调节植物生长和抗重金属胁迫中具有重要作用。重金属胁迫下植物为维持自身生长,必须维持生长素的内稳态和自身代谢平衡。生长素的内稳态受到生物合成、生长素结合以及水解、代谢失活等生理活动的严格控制。一些涉及生长素合成与分解的相关酶系和基因已被识别或克隆,然而重金属胁迫下与生长素合成与分解有关基因的上调或下调以及相关酶系的激活或失活却研究尚少。揭示植物遭受重金属胁迫后生长素合成与分解变化的机理,可为植物修复实践中合理使用植物生长调节剂提供理论依据。本文以生长素的主要代表物吲哚乙酸(IAA)为例,讨论重金属胁迫下,植物体内IAA合成、分解机制及其赋存形态等方面的研究进展,并从重金属胁迫下植物IAA合成途径的相对重要性、IAA形态变化和作用以及激素间的交互作用等方面探讨了该领域的研究方向。
 

关键词: 抑藻剂, 铜绿微囊藻, 陆生植物, 化感

Abstract: Auxin plays an important role in regulating the growth and heavy metal resistance of plants. The healthy growth of plants is a result of the homeostasis of auxin and the balanced plant metabolism under heavy metal stress. The homeostasis of auxin is strictly regulated by its biosynthesis, conjugation, hydrolysis and catabolism. Some enzymes and genes involved in auxin biosynthesis and degradation have been identified or cloned. However, little information is available regarding the enzymes and genes concerning auxin biosynthesis and degradation under heavy metal stress. Understanding the mechanisms related to auxin biosynthesis and degradation under heavy metal stress will be helpful to properly regulate plant growth during phytoremediation. Taking indoleacetic acid (IAA, a main representative substance of auxin) as an example, this review focused on the recent advances in the mechanisms of IAA biosynthesis and degradation, and its existing forms in plants under heavy metal stress. Prospects in this field have been proposed from the viewpoints of the relative importance of IAA biosynthesis routes, the variation of IAA forms and their functions, and the interactions among different plant hormones.

Key words: Microcystis aeruginosa, terrestrial plant, allelopathy, algistat