干旱引起的碳分配在棉花根和棉花的叶子之间的变化决定了棉花的重量形成
Jiangjing Ren1, Zhanyi Wang1, Qiang Li1
1College of Agriculture, Nanjing Agricultural University, Nanjing, 210095, PR China.
Plant physiology and biochemistry : PPB
|September 28, 2025
概括
干旱通过改变碳代谢而影响棉花产量. 在中度干旱后及时重新灌可以快速恢复光合作用和卵子重量,为水资源管理提供见解.
科学领域:
- 农业科学 农业科学
- 植物生理学 植物生理学
- 生物化学 生物化学
背景情况:
- 干旱压力通过改变碳代谢,特别是在关键的开花和花形成阶段,显著影响棉花产量.
- 了解干旱下的植物部分之间的碳分配对于管理作物生产率至关重要.
研究的目的:
- 研究干旱如何影响棉花根和棉花的叶子 (LSCB) 之间的碳分配.
- 为了确定改变碳分配对豆重量形成和种植棉花总产量的影响.
- 评估重新灌策略在恢复光合作用功能和产量的有效性.
主要方法:
- 进行了使用三个干旱级别 (75%,60%,45%土壤相对含水量) 和三个持续时间 (10,24,38天) 的实验.
- 用C同位素标记来追踪碳的同化和分配.
- 在LSCB和根中分析了酶活性 (SuSy,SPS,酸INV,INV) 和可溶糖含量.
主要成果:
- 干旱抑制了LSCB的光合作用性能,减少了LSCB和根中的碳输入和13C积累.
- 在LSCB,干旱增加了SuSy和SPS活动,同时降低了反转酶活动,导致糖糖积累和限制了豆运输.
- 在棉花根中,干旱增强了SuSy,SPS和逆转酶活动,增加了耐干旱的可溶糖,从而增加了根的碳需求.
- 在经历了10天的中度干旱后,重新灌迅速恢复了LSCB光合作用,优化了碳分配,并促进了重的恢复.
结论:
- 干旱导致的棉根和LSCB之间的碳分配变化会对毛重量和产量产生负面影响.
- 在中度,短期干旱后及时重新灌有利于恢复棉花光合作用,优化碳分配,并保持种子棉花产量.
- 结果为优化棉花水资源管理策略以减轻干旱影响提供了理论见解.
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