文献类型：期刊文献

英文题名：Phosphorus deficiency-induced cell wall pectin demethylesterification enhances cadmium accumulation in roots of Salix caprea

作者：Li, Ao[1] Wang, Yuancheng[1] Zou, Junzhu[1] Yin, Jiahui[1,2] Zhang, Shaowei[3] Li, Xia[4] Shen, Hao[5] Liu, Junxiang[1] Sun, Zhenyuan[1]

第一作者：Li, Ao

通信作者：Liu, JX[1];Sun, ZY[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Efficient Prod Forest Resources, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China;[2]Jilin Agr Univ, Coll Hort, Changchun 130118, Jilin, Peoples R China;[3]Henan Open Univ, Coll Rural Revitalizat, Zhengzhou 450046, Peoples R China;[4]Heze Univ, Coll Agr & Bioengn, Heze 274000, Shandong, Peoples R China;[5]Beijing Forestry Univ, Sch Grassland Sci, Beijing 100083, Peoples R China

年份：2024

卷号：357

外文期刊名：JOURNAL OF ENVIRONMENTAL MANAGEMENT

收录：;EI(收录号：20241415840098);Scopus(收录号：2-s2.0-85189077022);WOS:【SCI-EXPANDED(收录号:WOS:001289046200001)】；

基金：The present project was supported by the National Key R & D Pro-gram of China (Grant No.2020YFF0305901) , the Key Technologies R & D Program of Henan Province (Grant No. 232102110242) , the Key program, Natural Science Foundation of Shandong Province (Grant No. ZR2020KC020) , the Fundamental Research Funds for the Central Non-Profit Research Institution of the Chinese Academy of Forestry (Grant No. CAFYBB2023MA003) .

语种：英文

外文关键词：Cadmium; Cell wall; Pectin methylesterase; Phosphorus; Salix caprea

摘要：Regions affected by heavy metal contamination frequently encounter phosphorus (P) deficiency. Numerous studies highlight crucial role of P in facilitating cadmium (Cd) accumulation in woody plants. However, the regulatory mechanism by which P affects Cd accumulation in roots remains ambiguous. This study aims to investigate the effects of phosphorus (P) deficiency on Cd accumulation, Cd subcellular distribution, and cell wall components in the roots of Salix caprea under Cd stress. The results revealed that under P deficiency conditions, there was a 35.4% elevation in Cd content in roots, coupled with a 60.1% reduction in Cd content in shoots, compared to the P sufficiency conditions. Under deficient P conditions, the predominant response of roots to Cd exposure was the increased sequestration of Cd in root cell walls. The sequestration of Cd in root cell walls increased from 37.1% under sufficient P conditions to 66.7% under P deficiency, with pectin identified as the primary Cd binding site under both P conditions. Among cell wall components, P deficiency led to a significant 31.7% increase in Cd content within pectin compared to P sufficiency conditions, but did not change the pectin content. Notably, P deficiency significantly increased pectin methylesterase (PME) activity by regulating the expression of PME and PMEI genes, leading to a 10.4% reduction in the degree of pectin methylesterification. This may elucidate the absence of significant changes in pectin content under P deficiency conditions and the concurrent increase in Cd accumulation in pectin. Fourier transform infrared spectroscopy (FTIR) results indicated an increase in carboxyl groups in the root cell walls under P deficiency compared to sufficient P treatment. The results provide deep insights into the mechanisms of higher Cd accumulation in root mediated by P deficiency.