Stress physiology of Moringa oleifera under tropospheric ozone enrichment: An ecotype-specific investigation into growth, nonstructural carbohydrates, and polyphenols.

IF 6.2 1区 生物学 Q1 PLANT SCIENCES The Plant Journal Pub Date : 2024-10-30 DOI:10.1111/tpj.17107
Bárbara Baesso Moura, Yasutomo Hoshika, Cecilia Brunetti, Luana Beatriz Dos Santos Nascimento, Elena Marra, Elena Paoletti, Francesco Ferrini
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Abstract

Ozone (O3) is an oxidative pollutant that significantly threatens plant development and ecological dynamics. The present study explores the impact of O3 on Moringa (Moringa oleifera) ecotypes when exposed to ambient and elevated O3 levels. Elevated O3 concentrations resulted in significant reductions in total biomass for all ecotypes. Photosynthetic parameters, including stomatal conductance (gsto), CO2 assimilation (Pn), and carboxylation efficiency (K), decreased under elevated O3 in some ecotypes, indicating a detrimental effect on carbon assimilation. Nonstructural carbohydrate (NSC) levels in roots varied among ecotypes, with significant reductions in starch content observed under elevated O3, suggesting a potential shift towards soluble sugar accumulation and reallocation for antioxidant defense. Secondary metabolite analysis revealed increased polyphenol production, particularly quercetin derivatives, under elevated O3 in specific ecotypes, highlighting their role in mitigating oxidative stress. Interestingly, the glucosinolate content also varied, with some ecotypes exhibiting increased levels, suggesting a complex regulatory mechanism in response to O3 exposure. The study underscores the intrinsic variability among Moringa ecotypes in response to O3 stress, emphasizing the importance of genetic diversity for adaptation. The findings indicate that Moringa's metabolic plasticity, including shifts in NSC and SM production, plays a crucial role in its defense mechanisms against O3-induced oxidative stress. These insights are vital for optimizing the cultivation and utilization of Moringa in diverse environmental conditions, particularly in regions with elevated O3 levels.

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对流层臭氧富集条件下油辣木的应激生理:对生长、非结构性碳水化合物和多酚的生态型特异性研究。
臭氧(O3)是一种氧化污染物,严重威胁植物的生长发育和生态动态。本研究探讨了暴露于环境和高浓度臭氧时,臭氧对Moringa(Moringa oleifera)生态型的影响。高浓度的 O3 导致所有生态型的总生物量显著减少。一些生态型的光合参数,包括气孔导度(gsto)、二氧化碳同化(Pn)和羧化效率(K),在臭氧浓度升高的情况下均有所下降,表明对碳同化产生了不利影响。不同生态型根中的非结构碳水化合物(NSC)含量各不相同,在高浓度 O3 条件下,淀粉含量显著减少,表明可能转向可溶性糖的积累和抗氧化防御的重新分配。次生代谢物分析表明,在高浓度臭氧条件下,特定生态型的多酚产量增加,尤其是槲皮素衍生物,这突显了它们在减轻氧化应激方面的作用。有趣的是,葡萄糖苷酸含量也存在差异,一些生态型的含量有所增加,这表明在应对臭氧暴露时存在复杂的调节机制。这项研究强调了辣木生态型对 O3 胁迫反应的内在差异性,强调了遗传多样性对适应的重要性。研究结果表明,Moringa 的代谢可塑性,包括 NSC 和 SM 生产的变化,在其抵御 O3 诱导的氧化应激的防御机制中发挥着至关重要的作用。这些见解对于优化辣木在不同环境条件下的栽培和利用至关重要,尤其是在臭氧浓度升高的地区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
The Plant Journal
The Plant Journal 生物-植物科学
CiteScore
13.10
自引率
4.20%
发文量
415
审稿时长
2.3 months
期刊介绍: Publishing the best original research papers in all key areas of modern plant biology from the world"s leading laboratories, The Plant Journal provides a dynamic forum for this ever growing international research community. Plant science research is now at the forefront of research in the biological sciences, with breakthroughs in our understanding of fundamental processes in plants matching those in other organisms. The impact of molecular genetics and the availability of model and crop species can be seen in all aspects of plant biology. For publication in The Plant Journal the research must provide a highly significant new contribution to our understanding of plants and be of general interest to the plant science community.
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