The domestication-associated WHP10 tandem cluster of amino acid transporter genes enhances whole-plant protein accumulation in maize.

Wenhao Li; Youliang Li; Xiang Lin; Ruilin Chen; Wenjing Li; Chong You; Di Chen; Lulu Gao; Xiaoling Li; Shiqi Luo; Yunlong Li; Yuhua Long; Zhaoxu Hu; Yidong Zhu; Xin Li; Zhigui Bao; Yincong Gu; Shouchuang Wang; Linhan Sun; Wenqin Wang; Haihai Wang; Yongrui Wu; Yongcai Huang

doi:10.1016/j.molp.2026.07.014

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The domestication-associated WHP10 tandem cluster of amino acid transporter genes enhances whole-plant protein accumulation in maize.

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Abstract

Improving protein accumulation in maize is essential for sustainable agriculture, yet the regulatory mechanisms governing the intermediate "flow" of organic nitrogen remain elusive. Here, we show that the maize stem acts as a regulatory node for nitrogen allocation. By integrating spatial transcriptomics and metabolomics with quantitative genetics, we demonstrate that a transport-oriented stem program orchestrates the high-protein phenotype of the wild maize accession Ames21814. We identified a major locus, Whole-plant High Protein 10 (WHP10), that encodes a tandemly duplicated cluster of amino acid transporter genes. WHP10 exhibits strong vascular-biased expression, driven by promoter divergence that enhances the wild allele's activity. Functional assays and genetic validation support a model in which the WHP10 cluster facilitates the transport of multiple nitrogen-rich amino acids, thereby contributing to vascular-associated amino acid transport and post-uptake organic-nitrogen partitioning. Our findings establish stem flow as a regulatory layer for protein accumulation and identify WHP10 as a high-value target for precision breeding to enhance whole-plant protein accumulation without compromising grain yield.

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Zea mays Amino Acid Transport Systems Plant Proteins Domestication Gene Expression Regulation, Plant Nitrogen Multigene Family Amino Acids amino acid transporter domestication maize nitrogen partitioning spatial multi-omics whole-plant protein accumulation Journal Article

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Wenhao Li, Youliang Li, Xiang Lin, Ruilin Chen, Wenjing Li, Chong You, Di Chen, Lulu Gao, Xiaoling Li, Shiqi Luo, Yunlong Li, Yuhua Long, Zhaoxu Hu, Yidong Zhu, Xin Li, Zhigui Bao, Yincong Gu, Shouchuang Wang, Linhan Sun, Wenqin Wang, Haihai Wang, Yongrui Wu, Yongcai Huang. 2026-07-20. The domestication-associated WHP10 tandem cluster of amino acid transporter genes enhances whole-plant protein accumulation in maize.. https://doi.org/10.1016/j.molp.2026.07.014

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