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铁氧化酶对于木质部中Fe(II)的氧化至关重要，以确保在……中有健康的铁分配。

The ferroxidases are critical for Fe(II) oxidation in xylem to ensure a healthy Fe allocation in .

作者信息

Zhu Qing-Yang, Wang Yun, Liu Xing-Xing, Ye Jia-Yuan, Zhou Miao, Jing Xiang-Ting, Du Wen-Xin, Hu Wei-Jie, He Chao, Zhu Ya-Xin, Jin Chong-Wei

机构信息

College of Natural Resources and Environmental Science, Zhejiang University, Hangzhou, China.

Planting Technology Extension Center of Dongyang, Jinhua, China.

出版信息

Front Plant Sci. 2022 Aug 17;13:958984. doi: 10.3389/fpls.2022.958984. eCollection 2022.

DOI:10.3389/fpls.2022.958984
PMID:36061760
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9428407/
Abstract

The long-distance transport of iron (Fe) in the xylem is critical for maintaining systemic Fe homeostasis in plants. The loading form of Fe(II) into the xylem and the long-distance translocation form of Fe(III)-citrate have been identified, but how Fe(II) is oxidized to Fe(III) in the xylem remains unknown. Here, we showed that the cell wall-resided ferroxidases LPR1 and LPR2 (LPRs) were both specifically expressed in the vascular tissues of , while disruption of both of them increased Fe(II) in the xylem sap and caused excessive Fe deposition in the xylem vessel wall under Fe-sufficient conditions. As a result, a large amount of Fe accumulated in both roots and shoots, hindering plant growth. Moreover, under low-Fe conditions, were preferentially induced in old leaves, but the loss of LPRs increased Fe deposition in the vasculature of older leaves and impeded Fe allocation to younger leaves. Therefore, disruption of both LPRs resulted in severer chlorosis in young leaves under Fe-deficient conditions. Taken together, the oxidation of Fe(II) to Fe(III) by LPRs in the cell wall of vasculature plays an important role in xylem Fe allocation, ensuring healthy Fe homeostasis for normal plant growth.

摘要

铁（Fe）在木质部中的长距离运输对于维持植物体内的系统铁稳态至关重要。已确定Fe（II）进入木质部的装载形式以及Fe（III）-柠檬酸的长距离转运形式，但Fe（II）在木质部中如何氧化为Fe（III）仍不清楚。在此，我们表明细胞壁驻留的铁氧化酶LPR1和LPR2（LPRs）均在拟南芥的维管组织中特异性表达，而在铁充足条件下，二者功能缺失均会增加木质部汁液中的Fe（II）含量，并导致Fe在木质部导管壁中过度沉积。结果，大量的Fe在根和地上部中积累，阻碍植物生长。此外，在低铁条件下，LPRs在老叶中优先被诱导，但LPRs功能缺失会增加老叶维管系统中的Fe沉积，并阻碍Fe向幼叶的分配。因此，在缺铁条件下，LPRs功能缺失会导致幼叶出现更严重的黄化现象。综上所述，维管系统细胞壁中的LPRs将Fe（II）氧化为Fe（III）在木质部铁分配中起重要作用，确保正常植物生长所需的健康铁稳态。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/98af73d1171c/fpls-13-958984-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/e29a03e2f430/fpls-13-958984-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/b8024f3b7473/fpls-13-958984-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/103f8fc50334/fpls-13-958984-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/045a54adb03d/fpls-13-958984-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/f7182fa3526e/fpls-13-958984-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/e0451829d07a/fpls-13-958984-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/c0c1f08ca304/fpls-13-958984-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/98af73d1171c/fpls-13-958984-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/e29a03e2f430/fpls-13-958984-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/b8024f3b7473/fpls-13-958984-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/103f8fc50334/fpls-13-958984-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/045a54adb03d/fpls-13-958984-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/f7182fa3526e/fpls-13-958984-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/e0451829d07a/fpls-13-958984-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/c0c1f08ca304/fpls-13-958984-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3103/9428407/98af73d1171c/fpls-13-958984-g008.jpg

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