ABSTRACT Nitrate transporter 2.5 (NRT2.5) was originally characterized as the transporter for nitrogen (N) limitation. In Arabidopsis, NRT2.5 is expressed mainly under extremely low NO3 − and N starvation conditions, and this must work in conjunction with NAR2.1. NRT2.5 is expressed both in the roots and leaves in Arabidopsis, poplars, tea trees and cassava. This is also expressed in the seeds of Arabidopsis and wheat. In wheat, NRT2.5 is expressed in the embryo and shell and plays a role in the accumulation of NO3 − in the seeds. In maize, this is also expressed in silk, cobs and tassel husk leaves. In rice, OsNRT2.5 (also known as OsNRT2.3a) may help the species to remove NO3 − from the roots to shoots. In addition, NRT2.5 may interact with TGA3, MYC1, LBD37, LBD38, TaNAC2 and other transcription factors and participate in the transmission of NO3 − signals. The present review summarizes the functions of NRT2.5 in different plant species, which may help plant breeders and molecular biologists to improve crop yield. Abbreviations: NRT, Nitrate transporter; NUE, nitrogen use efficiency; PTR, peptide transporter; NPF, nitrate peptide transporter family; CLC, chloride channel; LAC1/SLAH, slow anion channel-associated 1 homolog 3; LATS, low-affinity transporter systems; HATS, high-affinity transport systems; NNP, nitrate-nitrite-porter; MFS, major facilitator superfamily.

中文翻译：

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硝酸盐转运蛋白2.5在植物中的表达模式和推测功能

摘要硝酸盐转运蛋白 2.5 (NRT2.5) 最初被描述为氮 (N) 限制的转运蛋白。在拟南芥中，NRT2.5 主要在极低的 NO3 - 和 N 饥饿条件下表达，这必须与 NAR2.1 结合使用。NRT2.5 在拟南芥、杨树、茶树和木薯的根和叶中均有表达。这也在拟南芥和小麦的种子中表达。在小麦中，NRT2.5 在胚和壳中表达，并在种子中 NO3 - 的积累中起作用。在玉米中，这也表现在丝、穗轴和流苏壳叶上。在水稻中，OsNRT2.5（也称为 OsNRT2.3a）可以帮助该物种从根部到芽部去除 NO3 - 。此外，NRT2.5 可能与 TGA3、MYC1、LBD37、LBD38、TaNAC2 和其他转录因子并参与 NO3 - 信号的传输。本综述总结了NRT2.5在不同植物物种中的作用，可能有助于植物育种家和分子生物学家提高作物产量。缩写：NRT，硝酸盐转运蛋白；NUE，氮利用效率；PTR，肽转运蛋白；NPF，硝酸盐肽转运蛋白家族；CLC，氯离子通道；LAC1/SLAH，慢阴离子通道相关 1 同源物 3；LATS，低亲和力转运系统；HATS，高亲和力运输系统；NNP，硝酸盐-亚硝酸盐-转运蛋白；MFS，主要促进者超家族。肽转运蛋白；NPF，硝酸盐肽转运蛋白家族；CLC，氯离子通道；LAC1/SLAH，慢阴离子通道相关 1 同源物 3；LATS，低亲和力转运系统；HATS，高亲和力运输系统；NNP，硝酸盐-亚硝酸盐-转运蛋白；MFS，主要促进者超家族。肽转运蛋白；NPF，硝酸盐肽转运蛋白家族；CLC，氯离子通道；LAC1/SLAH，慢阴离子通道相关 1 同源物 3；LATS，低亲和力转运系统；HATS，高亲和力运输系统；NNP，硝酸盐-亚硝酸盐-转运蛋白；MFS，主要促进者超家族。