文献类型：期刊文献

英文题名：Sulfur metabolism, organic acid accumulation and phytohormone regulation are crucial physiological processes modulating the different tolerance to Pb stress of two contrasting poplars

作者：Shi, Wenguang[1] Li, Jing[2] Kan, Donxu[1,3] Yu, Wenjian[1] Chen, Xin[1] Zhang, Yuhong[1] Ma, Chaofeng[1] Deng, Shurong[1] Zhou, Jing[1] Fayyaz, Payam[4] Luo, Zhi-Bin[1]

第一作者：石文广

通信作者：Shi, WG[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Key Lab Silviculture,State Forestry & Grassland A, Xiangshan Rd, Beijing 100091, Peoples R China;[2]Nanjing Forestry Univ, Coll Light Ind & Food Engn, Dept Food Sci & Technol, Longpan Rd, Nanjing 210037, Peoples R China;[3]Northeast Forestry Univ, State Key Lab Tree Genet & Breeding, Hexing Rd, Harbin 150040, Peoples R China;[4]Univ Yasuj, Agr & Nat Resources Fac, Forest Range & Watershed Management Dept, Daneshjoo St, Yasuj 7591963179, Iran

年份：0

外文期刊名：TREE PHYSIOLOGY

收录：;Scopus(收录号：2-s2.0-85130120474);WOS:【SCI-EXPANDED(收录号:WOS:000827790800001)】；

基金：This study was jointly supported by the National Natural ScienceFoundation of China (grant no. 31901286) and the Fundamental Research Funds for the Central Non-profit Research Institutions of CAF(grant no. CAFYBB2021QB001).

语种：英文

外文关键词：antioxidants; heavy metal; mineral elements; toxicity; woody plants

摘要：To investigate the pivotal physiological processes modulating lead (Pb) tolerance capacities of poplars, the saplings of two contrasting poplar species, Populus x canescens with high Pb sensitivity and Populus nigra with relatively low Pb sensitivity, were treated with either 0 or 8 mM Pb for 6 weeks. Lead was absorbed by the roots and accumulated massively in the roots and leaves, leading to overproduction of reactive oxygen species, reduced photosynthesis and biomass in both poplar species. Particularly, the tolerance index of P. x canescens was significantly lower than that of P. nigra. Moreover, the physiological responses including the concentrations of nutrient elements, thiols, organic acids, phytohormones and nonenzymatic antioxidants, and the activities of antioxidative enzymes in the roots and leaves were different between the two poplar species. Notably, the differences in concentrations of nutrient elements, organic acids and phytohormones were remarkable between the two poplar species. A further evaluation of the Pb tolerance-related physiological processes showed that the change of 'sulfur (S) metabolism' in the roots was greater, and that of 'organic acid accumulation' in the roots and 'phytohormone regulation' in the leaves were markedly smaller in P. x canescens than those in P. nigra. These results suggest that there are differences in Pb tolerance capacities between P. x canescens and P. nigra, which is probably associated with their contrasting physiological responses to Pb stress, and that S metabolism, organic acid accumulation and phytohormone regulation are probably the key physiological processes modulating the different Pb tolerance capacities between the two poplar species.