De-Methyl Esterification Modification of Root Pectin Mediates Cd Accumulation of Lactuca sativa.

IF 6 1区 生物学 Q1 PLANT SCIENCES Plant, Cell & Environment Pub Date : 2024-11-03 DOI:10.1111/pce.15240
Qian-Hui Zhang, Xuan-Tong Tan, Zhen-Bang Li, Yi-Qi Chen, Zhong-Yi Yang, Guo-Rong Xin, Chun-Tao He
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Abstract

Cadmium (Cd) contamination in agricultural soil brings severe health risks through the dietary intake of Cd-polluted crops. The comprehensive role of pectin in lowering Cd accumulation is investigated through low Cd accumulated (L) and high Cd accumulated (H) cultivars of L. sativa. The significantly different Cd contents in the edible parts of two L. sativa cultivars are accomplished by different Cd transportations. The pectin is the dominant responsive cell wall component according to significantly increased uronic acid contents and the differential Cd absorption between unmodified and modified cell wall. The chemical structure characterization revealed the decreased methyl esterification in pectin under Cd treatment compared with control. Significantly brighter LM19 relative fluorescence density and 40.82% decreased methanol in the root pectin of L cultivar under Cd treatment (p < 0.05) supported that the de-methyl esterification of root pectin is more significant in L cultivar than in H cultivar. The pectin de-methyl esterification of L cultivar is achieved by the upregulation of pectin esterases and the downregulation of pectin esterase inhibitors under Cd treatments, which has facilitated the higher Cd-binding of pectin. Our findings provide deep insight into the differential Cd accumulation of L. sativa cultivars and contribute to the understanding the pollutant behaviors in plants.

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根果胶的去甲基酯化修饰介导了乳齿植物的镉积累。
农业土壤中的镉(Cd)污染会通过膳食摄入受镉污染的农作物带来严重的健康风险。本研究通过低镉积累(L)和高镉积累(H)的荠菜栽培品种研究了果胶在降低镉积累方面的综合作用。两种荠菜栽培品种可食部分中镉含量的明显差异是由不同的镉转运作用造成的。果胶是细胞壁的主要反应成分,这体现在尿酸含量的显著增加,以及未改良细胞壁和改良细胞壁对镉的不同吸收率。化学结构表征显示,与对照组相比,镉处理下果胶的甲基酯化程度降低。在镉处理下,L 栽培品种根果胶中 LM19 相对荧光密度明显提高,甲醇含量降低了 40.82%(p<0.05)。
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来源期刊
Plant, Cell & Environment
Plant, Cell & Environment 生物-植物科学
CiteScore
13.30
自引率
4.10%
发文量
253
审稿时长
1.8 months
期刊介绍: Plant, Cell & Environment is a premier plant science journal, offering valuable insights into plant responses to their environment. Committed to publishing high-quality theoretical and experimental research, the journal covers a broad spectrum of factors, spanning from molecular to community levels. Researchers exploring various aspects of plant biology, physiology, and ecology contribute to the journal's comprehensive understanding of plant-environment interactions.
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