树枝源下沉比率和叶子衰老对 pistachio 植物光合作用的互动作用
Giulia Marino1, Paula Guzmán-Delgado1, Emily Santos1
1Department of Plant Sciences, University of California, Davis, Davis, CA, United States.
Frontiers in plant science
|August 21, 2023
概括
改变 pistachio 树的源水比率会影响光合作用和叶子衰老. 操纵水果负载或叶面积会影响树木如何管理资源,影响整体生产力和管理策略.
科学领域:
- 植物生理学 植物生理学
- 农业科学 农业科学
- 营养素循环循环的过程
背景情况:
- 树木的来源-沉没比率显著影响生理过程,如生长,光合作用和生产力.
- 了解这些动态对于优化作物产量至关重要,特别是在具有交替承载习惯的物种中.
研究的目的:
- 为了研究操纵的分支级源沉积比对 pistachio 树生理学的影响.
- 描述不同源-水槽条件下的叶子光合作用速率,非结构性碳水化合物 (NSC) 和 (N) 度的变化.
主要方法:
- 菲斯塔树的源下沉比率通过部分树枝脱叶或果实稀释而改变.
- 在整个生长季节测量了叶子光合作用光响应曲线,叶子老化,NSC和N度.
主要成果:
- 高源沉积比率显示最大净光合作用率 (ANmax) 逐渐下降,而低比率显示急剧下降.
- 高沉积分支在内核生长过程中增加了光合作用,而低源分支显示了与存储优先级相关的光合作用减少.
- 低源沉比加速了叶子衰老,由于NSC积累,导致ANmax显著下降.
结论:
- 源-沉积比率的操纵深刻影响 pistachio 生理学,影响光合作用效率和叶子衰老.
- 不同的机制是光合作用衰退的基础,以应对改变的源沉积比率,涉及重调动或同化优先级.
- 结果可以为农业管理实践提供信息,用于替代轴承树的作物负载调整.
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