干旱刺激了棉花 (Gossypium hirsutem) 中有机的根排泄
Harrison R Coker1, Heng-An Lin1, Caleb E B Shackelford1
1Department of Soil and Crop Sciences, Texas A&M University and Texas A&M AgriLife, College Station, TX, United States.
Frontiers in plant science
|December 4, 2024
概括
干旱显著增加了棉花根排泄物中的 (N),主要是通过各种有机分子,而不仅仅是氨基酸. 这影响了土壤的生态化学循环和微生物群落.
科学领域:
- 植物生物学 植物生物学
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
背景情况:
- (N) 的根排泄是植物对土壤的关键输入,影响微生物群落.
- 除了氨基酸之外,根排泄物中的有机N在树根球的生物地球化学循环中发挥着重要作用.
- 干旱对根排泄物N的代谢特征的影响仍未得到充分研究.
研究的目的:
- 在干旱压力下的棉花植物中,从数量和代谢学上调查的根排泄.
- 为了确定干旱和恢复期间根排泄物中有机N的组成.
- 评估干旱对根排泄物中特定含N的分子的影响.
主要方法:
- 成熟的棉花植物在飞机系统中接受了渐进的干旱和恢复处理.
- 根排泄物在9个时间点在18天内进行非破坏性采样.
- 进行了总有机C和N,无机N,自由氨基酸 (HPLC) 和非目标代谢量 (FT-ICR-MS) 的量化.
主要成果:
- 有机N分子构成了根排泄物N的最大分数 (20-30%的排泄物质量).
- 干旱显著增加了总有机N排泄 (62%),有机C (6%) 和自由氨基酸-N (562%).
- 代谢分析揭示了干旱特有的含N分子和改变的低分子量含N化合物,其中血清素,酸和谷氨酸被显著上调.
结论:
- 有机N的根排泄被棉花的干旱压力显著刺激.
- 干旱改变了含有N的根排液的组成和分子概况,这对土壤N循环有影响.
- 根排泄物N对干旱的反应对压力强度敏感.
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