Potassium enhances cadmium resistance ability of Panax notoginseng by brassinolide signaling pathway-regulated cell wall pectin metabolism

Liu, Pengfei; Jin, Zheng-Qiang; Dai, Chen; Guo, Lan-Ping; Cui, Xiuming; Yang, Ye

doi:10.1016/j.ecoenv.2021.112906

Cited by 15 publications

(5 citation statements)

References 32 publications

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“…The degree of pectin methylation is also an important factor in determining the heavy metal binding capacity of the cell wall. The degree of pectin methylation is widely recognized to be negatively correlated with the accumulation of metals in the cell wall (such as aluminum and cadmium) [ 39 , 42 ]. The demethylation of pectin is regulated by PME.…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, the role of melatonin in regulating the heavy metal binding ability of the cell wall has not received enough attention. Indeed, cell walls play a key role in enhancing plants’ heavy metal resistance, by preventing metals from entering the root cells [ 39 , 40 ]. Here, we hypothesized that melatonin could enhance the heavy metal binding ability of the cell wall by promoting the cell wall polysaccharide biosynthesis, thereby alleviating Cr toxicity in maize.…”

Section: Introductionmentioning

confidence: 99%

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Melatonin Alleviates Chromium Toxicity in Maize by Modulation of Cell Wall Polysaccharides Biosynthesis, Glutathione Metabolism, and Antioxidant Capacity

Yang

Ren

Lin

et al. 2023

IJMS

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Melatonin, a pleiotropic regulatory molecule, is involved in the defense against heavy metal stress. Here, we used a combined transcriptomic and physiological approach to investigate the underlying mechanism of melatonin in mitigating chromium (Cr) toxicity in Zea mays L. Maize plants were treated with either melatonin (10, 25, 50 and 100 μM) or water and exposed to 100 μM K2Cr2O7 for seven days. We showed that melatonin treatment significantly decreased the Cr content in leaves. However, the Cr content in the roots was not affected by melatonin. Analyses of RNA sequencing, enzyme activities, and metabolite contents showed that melatonin affected cell wall polysaccharide biosynthesis, glutathione (GSH) metabolism, and redox homeostasis. During Cr stress, melatonin treatment increased cell wall polysaccharide contents, thereby retaining more Cr in the cell wall. Meanwhile, melatonin improved the GSH and phytochelatin contents to chelate Cr, and the chelated complexes were then transported to the vacuoles for sequestration. Furthermore, melatonin mitigated Cr-induced oxidative stress by enhancing the capacity of enzymatic and non-enzymatic antioxidants. Moreover, melatonin biosynthesis-defective mutants exhibited decreased Cr stress resistance, which was related to lower pectin, hemicellulose 1, and hemicellulose 2 than wild-type plants. These results suggest that melatonin alleviates Cr toxicity in maize by promoting Cr sequestration, re-establishing redox homeostasis, and inhibiting Cr transport from the root to the shoot.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Melatonin Alleviates Chromium Toxicity in Maize by Modulation of Cell Wall Polysaccharides Biosynthesis, Glutathione Metabolism, and Antioxidant Capacity

Yang

Ren

Lin

et al. 2023

IJMS

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“…In addition, phosphorylation and dephosphorylation of proteins play a switching role in the molecular transmission process of plants that sense external stress signals (Schweighofer et al, 2004). Up‐regulation of multiple K + transporter genes in NJXZ may help alleviate DMA‐induced oxidative damage, maintain cell wall metabolism stability, and promote normal floral organ development (Tang et al, 2020; Liu et al, 2021; Li et al, 2022). DMA can up‐regulate a number of DEGs associated with Fe metabolism, such as Fe transporter and cytochrome P450 (CYPs).…”

Section: Discussionmentioning

confidence: 99%

Disturbed nutrient accumulation and cell wall metabolism in panicles are responsible for rice straighthead disease

Liu,

Zhang,

Bai

et al. 2024

Physiologia Plantarum

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Rice straighthead disease substantially reduces crop yield, posing a significant threat to global food security. Dimethylarsinic acid (DMA) is the causal agent of straighthead disease and is highly toxic to the reproductive tissue of rice. However, the precise physiological mechanism underlying DMA toxicity remains unknown. In this study, six rice varieties with varying susceptibility to straighthead were utilized to investigate the growth performance and element distribution in rice panicles under DMA stress through pot experiments, as well as to explore the physiological response to DMA using transcriptomic methods. The findings demonstrate significant variations in both DMA accumulation and straighthead sensitivity among cultivars. The susceptible varieties exhibited higher DMA accumulation indices and displayed typical symptoms of straighthead disease, including erect panicles, deformed rachides and husks, and reduced seed setting rate and grain yield when compared to the resistant varieties. Moreover, DMA addition promoted mineral nutrients to accumulate in rachides and husks but less in grains. DMA showed preferential accumulation in rice grains with a distribution pattern similar to that of Copper (Cu) and zinc (Zn) within the panicle. Transcriptome analyses underscored the substantial impact of DMA on gene expression related to mineral metabolism. Notably, DMA addition significantly up‐regulated the expression of pectin methylesterase, pectin lyase, polygalacturonase, and exogalacturonase genes in Nanjingxiangzhan, while these genes were down‐regulated or weakly expressed in Ruanhuayou 1179. The alteration of pectin metabolic pathways induced by DMA may lead to abnormality of cell wall assembly and modification, thereby resulting in deformed rice panicles.

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“…roots. As a result, the biosynthesis of brassinolides was hindered, leading to a reduced expression of the pectin methylesterase gene (PME) and then caused an increase in pectin methylation, which ultimately results in reduced Cd accumulation [118]. Applying boron (B) to the roots increases pectin content by modifying biosynthesis pathways, inhibiting pectinase activity, and reducing the expression levels of associated genes.…”

Section: Cell-wall Synthesismentioning

confidence: 99%

Inhibition Roles of Calcium in Cadmium Uptake and Translocation in Rice: A Review

Liu,

Feng,

Qiu

et al. 2023

IJMS

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Cadmium (Cd) contamination in rice grains is posing a significant threat to global food security. To restrict the transport of Cd in the soil-rice system, an efficient way is to use the ionomics strategy. Since calcium (Ca) and Cd have similar ionic radii, their uptake and translocation may be linked in multiple aspects in rice. However, the underlying antagonistic mechanisms are still not fully understood. Therefore, we first summarized the current knowledge on the physiological and molecular footprints of Cd translocation in plants and then explored the potential antagonistic points between Ca and Cd in rice, including exchange adsorption on roots, plant cell-wall composition, co-transporter gene expression, and transpiration inhibition. This review provides suggestions for Ca/Cd interaction studies on rice and introduces ionomics research as a means of better controlling the accumulation of Cd in plants.

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Potassium enhances cadmium resistance ability of Panax notoginseng by brassinolide signaling pathway-regulated cell wall pectin metabolism

Cited by 15 publications

References 32 publications

Melatonin Alleviates Chromium Toxicity in Maize by Modulation of Cell Wall Polysaccharides Biosynthesis, Glutathione Metabolism, and Antioxidant Capacity

Melatonin Alleviates Chromium Toxicity in Maize by Modulation of Cell Wall Polysaccharides Biosynthesis, Glutathione Metabolism, and Antioxidant Capacity

Disturbed nutrient accumulation and cell wall metabolism in panicles are responsible for rice straighthead disease

Inhibition Roles of Calcium in Cadmium Uptake and Translocation in Rice: A Review

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