<br>人工腐植酸的光合作用促进机制取决于植物类型：C3和C4植物的水培研究,Science of the Total Environment

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人工腐植酸的光合作用促进机制取决于植物类型：C3和C4植物的水培研究
Science of the Total Environment ( IF 8.2 ) Pub Date : 2024-01-26 , DOI: 10.1016/j.scitotenv.2024.170404
Yancai Zhi ₁ , Xiaona Li ₂ , Xiaowei Wang ₁ , Minghao Jia ₁ , Zhenyu Wang ₃

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改善植物光合作用来实现碳中和的全球气候目标是可行的。人工腐植酸（AHA）的应用是促进植物光合作用的一种有前途的方法，然而，C3和C4植物的相关机制仍不清楚。本研究首次利用实时叶绿素荧光参数和非侵入性微测试技术揭示了应用AHA后植物叶片细胞的实时叶绿素合成和微观生理变化。转录组学表明，AHA 的应用上调了玉米中与光合作用有关的基因，尤其是与叶绿素合成和光能捕获相关的基因，以及生菜中与光合作用活力和碳水化合物代谢过程相关的基因。结构方程模型表明，AHA中的光降解物质和生长激素直接促进C4植物的光合作用（0.37）。 AHA 通过上调参与光捕获和转化的功能基因（例如和）来间接促进 C4 植物的光合作用 (0.96)。相比之下，AHA主要通过增加叶绿素合成，以及生菜暗反应中的Rubisco活性和表达（0.55）来间接促进C3植物的光合作用。此外，AHA 显着改善了 C3 植物叶片中的镁转移和通量，间接促进植物光合作用 (0.24)。最终，AHA使玉米的净光合速率提高了46.50%，使生菜的净光合速率提高了88.00%。使用富含营养和激素的 AHA 可以改善植物生长和光合作用，甚至比传统的 Hoagland 溶液更好。这项工作揭示了C3和C4植物不同的光合作用促进机制，指导了AHA的合成和在绿色农业中的高效应用，并为在不久的将来发展AHA技术应对CO排放引起的气候变化提出了建议。

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Photosynthesis promotion mechanisms of artificial humic acid depend on plant types: A hydroponic study on C3 and C4 plants

It is feasible to improve plant photosynthesis to address the global climate goals of carbon neutrality. The application of artificial humic acid (AHA) is a promising approach to promote plant photosynthesis, however, the associated mechanisms for C3 and C4 plants are still unclear. In this study, the real-time chlorophyll synthesis and microscopic physiological changes in plant leave cells with the application of AHA were first revealed using the real-time chlorophyll fluorescence parameters and Non-invasive Micro-test Technique. The transcriptomics suggested that the AHA application up-regulated the genes in photosynthesis, especially related to chlorophyll synthesis and light energy capture, in maize and the genes in photosynthetic vitality and carbohydrate metabolic process in lettuce. Structural equation model suggested that the photodegradable substances and growth hormones in AHA directly contributes to photosynthesis of C4 plants (0.37). AHA indirectly promotes the photosynthesis in the C4 plants by upregulating functional genes (e.g., and ) involved in light capture and transformation (0.96). In contrast, AHA mainly indirectly promotes C3 plants photosynthesis by increasing chlorophyll synthesis, and the Rubisco activity and the expression in the dark reaction of lettuce (0.55). In addition, Mg transfer and flux in C3 plant leaves was significantly improved by AHA, indirectly contributes to plant photosynthesis (0.24). Finally, the AHA increased the net photosynthetic rate of maize by 46.50 % and that of lettuce by 88.00 %. Application of the nutrients- and hormone-rich AHA improves plant growth and photosynthesis even better than traditional Hoagland solution. The revelation of the different photosynthetic promotion mechanisms on C3 and C4 plant in this work guides the synthesis and efficient application of AHA in green agriculture and will propose the development of AHA technology to against climate change resulting from CO emissions in near future.

更新日期：2024-01-26

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