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首页> 外文期刊>Scientific reports. >Physiological and biochemical changes during drought and recovery periods at tillering and jointing stages in wheat ( Triticum aestivum L.)
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Physiological and biochemical changes during drought and recovery periods at tillering and jointing stages in wheat ( Triticum aestivum L.)

机译：小麦分Tri和拔节期干旱和恢复期的生理生化变化（Triticum aestivum L.）

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Defining the metabolic strategies used by wheat to tolerate and recover from drought events will be important for ensuring yield stability in the future, but studies addressing this critical research topic are limited. To this end, the current study quantified the physiological, biochemical, and agronomic responses of a drought tolerant and drought sensitive cultivar to periods of water deficit and recovery. Drought stress caused a reversible decline in leaf water relations, membrane stability, and photosynthetic activity, leading to increased reactive oxygen species (ROS) generation, lipid peroxidation and membrane injury. Plants exhibited osmotic adjustment through the accumulation of soluble sugars, proline, and free amino acids and increased enzymatic and non-enzymatic antioxidant activities. After re-watering, leaf water potential, membrane stability, photosynthetic processes, ROS generation, anti-oxidative activities, lipid peroxidation, and osmotic potential completely recovered for moderately stressed plants and did not fully recover in severely stressed plants. Higher photosynthetic rates during drought and rapid recovery after re-watering produced less-pronounced yield declines in the tolerant cultivar than the sensitive cultivar. These results suggested that the plant’s ability to maintain functions during drought and to rapidly recover after re-watering during vegetative periods are important for determining final productivity in wheat.
机译：定义小麦用于耐受干旱事件并从干旱事件中恢复的代谢策略对于确保未来的产量稳定非常重要，但是针对这一关键研究主题的研究非常有限。为此，当前的研究量化了耐旱和对干旱敏感的品种对缺水和恢复期的生理，生化和农艺反应。干旱胁迫导致叶片水分关系，膜稳定性和光合活性的可逆下降，导致增加的活性氧（ROS）生成，脂质过氧化和膜损伤。植物通过可溶性糖，脯氨酸和游离氨基酸的积累表现出渗透调节作用，并增加了酶促和非酶促抗氧化活性。重新浇水后，中度胁迫植物的叶片水势，膜稳定性，光合作用，ROS生成，抗氧化活性，脂质过氧化和渗透势完全恢复，而在重度胁迫植物中则没有完全恢复。干旱期间较高的光合速率和复水后的快速恢复使耐性品种的发音下降幅度小于敏感品种。这些结果表明，该植物在干旱期间保持功能并在营养期重新浇水后迅速恢复的能力对于确定小麦的最终生产力至关重要。

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