| 摘要: |
| 植物能够通过渗透调节、脱水保护、代谢调整等多种途径适应干旱胁迫。在受到轻度干旱胁迫时，渗透调节是主要途径。当干旱胁迫的强度超出渗透调节的范围时，失水成为必然，lea蛋白及糖类等脱水保护物质在植物中的积累有利于保护生物大分子，尤其是膜系统免受破坏。长期轻度干旱能改变某些植物的代谢途径，有利于植物适应干旱环境。主要阐述了与渗透调节、脱水保护、代谢调整相关的基因表达调控及抗旱基因工程的研究进展。 |
| 关键词: 植物 抗旱 基因 分子机理 |
| DOI： |
| 分类号:Q789 |
| 基金项目: |
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| Molecular Mechanism of Plant Drought Tolerance |
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| Abstract: |
| Plant could adapt water stress through osmotic adjustment, desiccation
protection and metabolic changes. Under slight stress condition, osmotic adjustment
plays the role.With more severe stress desiccation occurs,Accumulation of desiccation
protectants such as LEA (Late Embryogenesis Abundant) protein and sugars avoids
damage of biomacromolecules, especially membrane system in some extent. Long time
mild water stress may change plantmetabolic pathways, which is useful for plant to
adapt stress conditions.This paper reviews the proceedings of gene expression and regulation in relation to osmotic adjustment,desiccation protection and metabolic changes.
Proceedings of genetic transformation confering drought tolerance is also reviewed. |
| Key words: plant drought tolerance gene molecular mechanism |
