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菌培养物,细胞提取物和个体毒素降低陆地植物Lactuca sativa和Zea mays的光合作用

Scott A Heckathorn¹, Clare T Muller¹, Michael D Thomas¹

¹Department of Environmental Sciences, University of Toledo, Toledo, OH 43606, USA.

Plants (Basel, Switzerland)

|November 27, 2024

概括

菌有害藻类繁殖 (cHABs) 影响作物光合作用. 来自cHABs的毒素对玉米和生菜中的净光合作用和叶绿素产生负面影响,根据暴露方法产生不同的影响.

科学领域:

环境科学环境科学
植物生理学植物生理学
毒理学毒理学毒理学

背景情况:

蓝藻有害藻类繁殖 (cHABs) 正在全球范围内增加,原因是肥胖和气候变化.
用cHAB污染的淡水灌对农业构成风险.
之前关于cHAB毒素对植物光合作用的影响的研究显示了不同的结果.

研究的目的:

研究蓝菌活体培养,细胞提取物和单个毒素对玉米和生菜的光合作用的影响.
为了确定不同的暴露途径 (根与叶子透) 如何影响光合作用反应.
分析毒素的特定影响,如毒素-a,BMAA,LPS和微囊素-LR在植物生理学上.

主要方法:

完整的玉米和生菜植物通过根部暴露于蓝藻菌种和个体毒素.
叶子组织被真空透了培养物和毒素.
光合作用测量包括净光合作用 (Pn),光系统-II (PSII) 电子传输产量 (ΦPSII),鲁比斯科活性和叶绿素度.
主要组件分析被用来评估整体效应.

主要成果:

在完整的植物中,根部暴露于蓝菌培养物或毒素降低了净光合作用 (Pn) 和叶子叶绿素度.
光系统-II (PSII) 电子运输产量 (ΦPSII) 在被毒素透的叶子组织 (LPS,MC-LR) 中在照明下降.
除了Pn.外,阿纳托克辛-a显著降低了鲁比斯科的活性.
甲状腺体的体外光合作用没有受到任何毒素的显著影响.
主要成分分析揭示了每个毒素和培养物的独特光合作用反应模式.

结论:

菌毒素在生态相关度下始终影响植物光合作用.
暴露方式 (根部吸收与叶子透) 和特定的毒素类型显著改变了光合作用效应.
这些发现凸显了cHABs通过污染的灌水对作物生产所带来的复杂风险.

关键词:

亚纳托克辛是一种亚纳托克辛.甲基-氨基-L-氨酸β-甲基-氨基-L-氨酸有害的藻类繁殖藻类繁殖脂多糖类糖化物脂多糖类糖化物微囊是一种微囊 (microcystin).光合作用的速度.

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