数字农科院2.0

A node-localized transporter TaSPDT is responsible for the distribution of phosphorus to grains in wheat

文献类型： 外文期刊

作者： Wang, Aiying;Duan, Yaoke;Wang, Rong;Li, Shuang;Cui, Keqiao;Kong, Xiaoping;Gao, Feijuan;He, Bochao;Jiao, Zhen;Sun, Hao

作者机构：

关键词： wheat;phosphate transporter;phosphorus use efficient;node;sulfate transporter;xylem unloading;phloem reloading

期刊名称： PLANT JOURNAL

ISSN： 0960-7412

年卷期： 2025 年 121 卷 5 期

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Wheat (Triticum aestivum L.) is one of the world's main food crops and the largest phosphorus (P) fertilizer consumer globally. However, the molecular mechanism of P distribution in wheat remains largely unknown. This study investigated the TaSULTR gene family and functionally characterized TaSPDT (TaSULTR3;4). Thirty-three TaSULTR genes were identified and divided into four groups. These genes contained three tandem duplications and 28 segmental duplications. TaSPDT was localized on the plasma membrane and demonstrated P transport activity. TaSPDT was mainly expressed at nodes, and its expression was elevated under low P conditions. TaSPDT was distributed on the xylem and phloem of enlarged and diffuse vascular bundles at nodes, as well as on the parenchyma cell bridge between vascular bundles. TaSPDT knockout reduced P distribution to young leaves but increased it in older leaves during the vegetative stage under low P availability. P uptake by roots, transfer to above-ground tissues, and redistribution within aerial organs were unaffected. At the reproductive stage, TaSPDT knockout notably diminished P allocation to grains, resulting in a significant decrease in grain yield, particularly under P-deficient conditions. These results suggest that TaSPDT mediates the transmembrane transport of P from the xylem to the phloem at the nodes, resulting in the preferential distribution of P to grains. This study enables a better understanding of the TaSULTR gene family and P distribution in wheat.

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