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Background <p>Phosphorus (P) is an essential macronutrient for plant growth and development. The absorption and transport of phosphate in plants rely on phosphate transporter-encoded proteins, named PHT1 transporters. Flowering Chinese cabbage is an important vegetable crop, while the molecular mechanisms underlying PHT1-mediated phosphate adaptation to low-phosphate stress remain poorly understood in this species.</p> Results <p>In this study, we identified 13 PHT1 transporter proteins in flowering Chinese cabbage, <i>BcPHT1;9</i> was predominantly expressed in the roots and localized to the plasma membrane. Overexpression of <i>BcPHT1;9</i> significantly increased total root length, surface area, and phosphorus content under low-phosphate stress, whereas silencing suppressed these traits. <i>BcPHT1;9</i> thus coordinately regulates Pi uptake, phosphate homeostasis, and root architectural adaptation to sustain balanced phosphorus nutrition under phosphate-deficient conditions.</p> Conclusion <p><i>BcPHT1;9</i> positively enhances low-Pi tolerance by coordinating phosphate uptake and root architecture in flowering Chinese cabbage.</p>

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BcPHT1;9 mediates phosphate uptake and modulates root architecture in flowering Chinese cabbage

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月5日

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  • Wenjie Yang,
  • Yanxu Xue,
  • Ali Anwar,
  • Caizhu Hu,
  • Mengge Zhang,
  • Chunfeng Chen,
  • Jinmiao Wang,
  • Shiwei Song

摘要

Background

Phosphorus (P) is an essential macronutrient for plant growth and development. The absorption and transport of phosphate in plants rely on phosphate transporter-encoded proteins, named PHT1 transporters. Flowering Chinese cabbage is an important vegetable crop, while the molecular mechanisms underlying PHT1-mediated phosphate adaptation to low-phosphate stress remain poorly understood in this species.

Results

In this study, we identified 13 PHT1 transporter proteins in flowering Chinese cabbage, BcPHT1;9 was predominantly expressed in the roots and localized to the plasma membrane. Overexpression of BcPHT1;9 significantly increased total root length, surface area, and phosphorus content under low-phosphate stress, whereas silencing suppressed these traits. BcPHT1;9 thus coordinately regulates Pi uptake, phosphate homeostasis, and root architectural adaptation to sustain balanced phosphorus nutrition under phosphate-deficient conditions.

Conclusion

BcPHT1;9 positively enhances low-Pi tolerance by coordinating phosphate uptake and root architecture in flowering Chinese cabbage.