Ascorbic acid metabolism: New knowledge on mitigation of aluminum stress in plants

IF 6.1 2区生物学 Q1 PLANT SCIENCES

Plant Physiology and Biochemistry Pub Date : 2024-10-22 DOI:10.1016/j.plaphy.2024.109228

Paz Cárcamo-Fincheira , Adriano Nunes-Nesi , Braulio Soto-Cerda , Claudio Inostroza-Blancheteau , Marjorie Reyes-Díaz

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Abstract

Ascorbic acid (ASC) is an important antioxidant in plant cells, being the main biosynthesis pathway is L-galactose or Smirnoff-Wheeler. ASC is involved in plant growth and development processes, being a cofactor and regulator of multiple signaling pathways in response to abiotic stresses. Aluminum toxicity is an important stressor under acidic conditions, affecting plant root elongation, triggering ROS induction and accumulation of hydrogen peroxide (H₂O₂). To mitigate damage from Al-toxicity, plants have evolved mechanisms to resist stress conditions, such as Al-tolerance and Al-exclusion or avoidance, both strategies related to the forming of non-phytotoxic complexes or bind-chelates among Al and organic molecules like oxalate. Dehydroascorbate (DHA) degradation generates oxalate when ASC is recycled, and dehydroascorbate reductase (DHAR) expression is inhibited. An alternative strategy is ASC regeneration, mainly due to a higher level of DHAR gene expression and low monodehydroascorbate reductase (MDHAR) gene expression. Therefore, studies performed on Fagopyrum esculentum, Nicotiana tabacum, Poncirus trifoliate, and V. corymbosum suggest that ASC is associated with the Al-resistant mechanism, given the observed enhancements in defense mechanisms, including elevated antioxidant capacity and oxalate production. This review examines the potential involvement of ASC metabolism in Al-resistant mechanisms.

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抗坏血酸代谢：缓解植物铝胁迫的新知识。

抗坏血酸（ASC）是植物细胞中一种重要的抗氧化剂，其主要的生物合成途径是 L-半乳糖或 Smirnoff-Wheeler。ASC 参与植物的生长和发育过程，是多种信号通路的辅助因子和调节器，可应对非生物胁迫。铝毒性是酸性条件下的一种重要胁迫，会影响植物根系的伸长，引发 ROS 诱导和过氧化氢（H2O2）积累。为了减轻铝毒性造成的损害，植物进化出了抵抗胁迫条件的机制，如铝耐受性和铝排斥或回避，这两种策略都与铝和草酸盐等有机分子之间形成非植物毒性复合物或结合螯合物有关。当 ASC 被回收时，脱氢抗坏血酸（DHA）降解产生草酸盐，脱氢抗坏血酸还原酶（DHAR）的表达受到抑制。另一种策略是 ASC 再生，这主要是因为 DHAR 基因表达水平较高，而单脱氢抗坏血酸还原酶（MDHAR）基因表达水平较低。因此，在 Fagopyrum esculentum、Nicotiana tabacum、Poncirus trifoliate 和 V. corymbosum 上进行的研究表明，ASC 与抗铝机制有关，因为观察到防御机制得到了加强，包括抗氧化能力和草酸盐产量的提高。本综述探讨了 ASC 代谢在抗铝机制中的潜在参与。

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

Plant Physiology and Biochemistry 生物-植物科学

CiteScore

11.10

自引率

3.10%

发文量

410

审稿时长

33 days

期刊介绍： Plant Physiology and Biochemistry publishes original theoretical, experimental and technical contributions in the various fields of plant physiology (biochemistry, physiology, structure, genetics, plant-microbe interactions, etc.) at diverse levels of integration (molecular, subcellular, cellular, organ, whole plant, environmental). Opinions expressed in the journal are the sole responsibility of the authors and publication does not imply the editors'' agreement. Manuscripts describing molecular-genetic and/or gene expression data that are not integrated with biochemical analysis and/or actual measurements of plant physiological processes are not suitable for PPB. Also "Omics" studies (transcriptomics, proteomics, metabolomics, etc.) reporting descriptive analysis without an element of functional validation assays, will not be considered. Similarly, applied agronomic or phytochemical studies that generate no new, fundamental insights in plant physiological and/or biochemical processes are not suitable for publication in PPB. Plant Physiology and Biochemistry publishes several types of articles: Reviews, Papers and Short Papers. Articles for Reviews are either invited by the editor or proposed by the authors for the editor''s prior agreement. Reviews should not exceed 40 typewritten pages and Short Papers no more than approximately 8 typewritten pages. The fundamental character of Plant Physiology and Biochemistry remains that of a journal for original results.