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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 1 ; Duan, Yaoke 1 ; Wang, Rong 2 ; Li, Shuang 1 ; Cui, Keqiao 2 ; Kong, Xiaoping 4 ; Gao, Feijuan 2 ; He, Bochao 2 ; Jiao, Zhen 1 ; Sun, Hao 1 ;

作者机构： 1.Zhengzhou Univ, Sch Agr Sci, Natl Key Lab Cotton Biobreeding & Integrated Utili, Zhengzhou Res Base, Zhengzhou 450001, Peoples R China

2.Zhengzhou Univ, Sch Agr Sci, Henan Key Lab Ion beam Green Agr Bioengn, Zhengzhou 450052, Peoples R China

3.China Natl Rice Res Inst, Hangzhou 311401, Peoples R China

4.Xining Vegetable Tech Serv Ctr, Xining 810000, Peoples R China

5.Zhengzhou Univ, Sanya Inst, Zhengzhou 450001, Peoples R China

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

期刊名称：PLANT JOURNAL （ 影响因子：5.7； 五年影响因子：7.0 ）

ISSN： 0960-7412

年卷期： 2025 年 121 卷 5 期

页码：

收录情况： SCI

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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