在黑暗和光明条件下的净O2汇率,跨越不同的茎区
Sara Natale1,2, Lucas Léon Peralta Ogorek3,4, Ludovico Caracciolo5
1Dipartimento di Scienze della Vita, Università di Trieste, Via L. Giorgieri 10, Trieste, 34127, Italy.
The New phytologist
|May 4, 2024
概括
像Fraxinus ornus这样的木质植物的茎光合作用在树皮和木材中都很活跃,年轻的茎表现出更高的活动. 树皮对氧气生产的贡献最大,但木质质体也进行光合作用并适应光.
科学领域:
- 植物生理学 植物生理学
- 树木植物生物学 植物生物学
- 光合作用研究研究 光合作用研究
背景情况:
- 木质植物表现出茎光合作用活动,但其生态意义以及树皮和木材的作用仍然不清楚.
- 了解茎光合作用对于植物碳预算和生存策略至关重要.
研究的目的:
- 为了研究不同年龄的Fraxinus ornus.树干中的叶绿体的功能特征.
- 量化干组织中的氧气生产速度和光系统组成.
主要方法:
- 利用微传感器技术测量整个茎,树皮和木材中的氧气产量.
- 采用光终身成像显微镜 (FLIM) 来确定光系统I与光系统II的叶绿素比率 (PSI:PSII).
主要成果:
- 在所有茎部位 (整个茎,树皮,木材) 证明了光诱导的氧气生产.
- 观察到年轻茎的光合作用活动和呼吸率较高,与老茎相比.
- 树皮被确定为净氧气生产的主要贡献者,木质叶绿体也具有光合作用活性,并且显示出较低的PSI丰度.
结论:
- 在Fraxinus ornus中,茎叶质体具有光合作用活性,并且能够依赖光的电子运输.
- 茎光合作用因茎年龄和组织类型而异,叶绿体的适应性可能与光质量有关.
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