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| 1 | An Arabidopsis vasculature distributed metal tolerance protein facilitates xylem magnesium diffusion to shoots under high-magnesium environments显示文摘Magnesium(Mg^(2+)) is an essential metal for plant growth;however, its over-accumulation in cells can be cytotoxic. The metal tolerance protein family(MTP) belongs to an ubiquitous family of cation diffusion facilitator(CDF) proteins that export divalent metal cations for metal homeostasis and tolerance in all organisms. We describe here the identification of MTP10 to be critical for xylem Mg homeostasis in Arabidopsis under high Mg^(2+) conditions. The Arabidopsis plant contains 12 MTP genes, and only knockout of MTP10 decreased the tolerance of high-Mg stress. The functional complementation assays in a Mg^(2+)-uptake-deficient bacterial strain MM281 confirmed that MTP10 conducted Mg;transport.MTP10 is localized to the plasma membrane of parenchyma cells around the xylem. Reciprocal grafting analysis further demonstrated that MTP10 functions in the shoot to determine the shoot growth phenotypes under high Mg^(2+) conditions.Moreover, compared to the wild type, the mtp10 mutant accumulated more Mg^(2+) in xylem sap under high-Mg stress. This study reveals that MTP10 facilitates Mg^(2+) diffusion from the xylem to shoots and thus determines Mg homeostasis in shoot vascular tissues during high-Mg stress. | Haiman Ge Yuan Wang Jinlin Chen Bin Zhang Rui Chen Wenzhi Lan Sheng Luan Lei Yang | 2022 | Journal of Integrative Plant Biology2022，64，1： | 0 |
| 2 | Effects of Manganese Toxicity on the Growth and Gene Expression at the Seedling Stage of Soybean显示文摘In order to investigate the effects of Manganese(Mn)toxicity stress on the growth and gene expression at the seedling stage of soybean,soybean seedlings were treated with normal Mn concentration(5μmol/L MnSO_(4))and excess Mn concentration(100μmol/L MnSO_(4))by the method of hydroponic culture in this study.When soybean was subjected to Mn toxicity stress,excessive Mn could affect seedling growth,root development,the number of Mn oxide spots in leaves,and the Mn accumulation content in different parts of soybean.With the increase of exogenous Mn concentration and the prolongation of culture time,the shoot and root biomasses of soybean decreased significantly,but the plant height of soybean had no obvious effects.The total root length,root surface area and root volume of soybean decreased significantly,but the taproot length,taproot tip length and root diameter did not change significantly.The number of Mn spots in the primary leaves(first leaf)was significantly more than that in the old leaves(second leaf)and the youngest leaves(fourth leaf).The Mn concentration in leaves was significantly higher than that in roots,and the Mn concentration in the old leaves was significantly higher than that in youngest leaves with the method of inductively coupled plasma atomic emission spectrometry(ICP-AES).Moreover,the results in the present study suggested that the 10 selected genes were significantly up-regulated or down-regulated by Mn toxicity in the old and young leaves by quantitative real-time PCR(qRT-PCR)analysis.This indicates that these genes might be important in the process of regulation in old and young leaves of the physiological responses and ion transporting to Mn toxicity stress. | Ying Liu Jingye Chen Xiaohao Li Shaoxia Yang Hanqiao Hu Yingbin Xue | 2022 | Phyton-International Journal of Experimental Botany2022，91，5： | 0 |
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