根据解剖模型,在木中慢性O3暴露下降的中粒细胞导电性反映了更厚的细胞壁和增加的亚细胞扩散通路长度
Ricardo Joffe1, Tiina Tosens2, Audrey Berthe1
1Faculté des Sciences et Technologies, Université de Lorraine, AgroParisTech, INRAE, SILVA, Nancy, France.
Plant, cell & environment
|August 5, 2024
概括
臭氧污染通过降低二氧化碳中粒细胞导电率 (gm) 来显著降低植物光合作用. 这主要是由于解剖学变化,如更厚的细胞壁和改变的叶绿体定位,影响作物产量.
科学领域:
- 植物生理学 植物生理学
- 环境科学 环境科学
- 植物解剖学 植物解剖学
背景情况:
- 臭氧 (O3) 是一个主要的空气污染物,影响全球作物产量和植物健康.
- 众所周知,暴露于臭氧会降低二氧化碳中粒细胞导电率 (gm),这是光合作用的一个关键因素.
- 关于O3诱导的叶子解剖学变化及其对GM的影响的定量数据有限.
研究的目的:
- 为了研究臭氧暴露如何改变叶子的解剖特征.
- 确定这些解剖学变化对二氧化碳中粒细胞导电率 (gm) 的影响.
- 确定在臭氧压力下限制光合作用的特定解剖和亚细胞组件.
主要方法:
- 两个Populus × canadensis克隆的暴露在120ppb O3中,持续了21天.
- 利用解剖扩散模型分析了叶子内的整个二氧化碳扩散途径.
- 叶子解剖学特征的量化变化及其与GM的相关性.
主要成果:
- 臭氧暴露显著降低了gm,将其确定为光合作用的主要限制.
- 细胞壁厚度增加和质体定位改变是减少基因组的关键驱动因素.
- 每面积的叶子干量不受臭氧的影响,与gm无关.
- 转基因和叶子解剖学之间的关系是克隆依赖的.
结论:
- 臭氧引起的解剖学变化,特别是细胞壁厚度和叶绿体排列,大大损害了CO2扩散和光合作用.
- 影响GM的叶子解剖特征是可变的,即使在密切相关的植物系内也是如此.
- 需要进一步研究环境压力下限制转基因的因素.
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