汉博尔特评论:可以通过增加干碳水化合物和它们的调动到谷物中来减轻干旱压力
1Sabanci University, Faculty of Engineering and Natural Sciences, 34956 Istanbul, Turkey.
Journal of plant physiology
|August 14, 2024
概括
(K) 对面临干旱压力的作物至关重要. 最佳的K营养有助于碳水化合物储存在茎中,这对于在缺水情况下的谷物填充至关重要.
科学领域:
- 农业科学 农业科学
- 植物生理学 植物生理学
- 环境压力生物学
背景情况:
- (K) 缺乏在作物中很常见,严重的干旱和热压力影响.
- 低K损害了透调节和碳代谢,加剧了压力影响.
- 关于K的减压机制现有的知识是不完整的.
研究的目的:
- 审查K对抗干旱压力的保护作用.
- 提出一种新的K介导干旱耐受性机制.
- 突出树干碳水化合物储备在抗旱能力方面的作用.
主要方法:
- 文献综述和关于和干旱压力的当前研究的综合.
- 分析与植物K营养相关的生理和生化数据.
- 关于K在碳水化合物分区中的作用的概念框架开发.
主要成果:
- 最佳的K营养通过改善透调节和光合作用来增强耐旱能力.
- 一个新的机制表明,K促进了用于谷物填充的干碳水化合物储存.
- 当干旱限制光合作用和运输时,茎碳水化合物储备至关重要.
结论:
- 对于减轻作物干旱压力至关重要.
- K影响碳水化合物分离到茎,支持干旱下的谷物产量.
- 监测植物K状态,特别是茎K,对于干燥环境中的产量至关重要.
相关概念视频
02:34Water and Mineral Acquisition
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
02:12Short-distance Transport of Resources
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
02:03Xylem and Transpiration-driven Transport of Resources
The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.
01:57Adaptations that Reduce Water Loss
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
02:41Responses to Drought and Flooding
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
02:02Responses to Salt Stress
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.