Discovery of SOD5 as a novel regulator of nitrogen-use efficiency and grain yield via altering auxin level

IF 8.1 1区生物学 Q1 PLANT SCIENCES New Phytologist Pub Date : 2025-03-06 DOI:10.1111/nph.70038

Siyu Zhang, Yunzhi Huang, Zhe Ji, Yongzhi Fang, Yanan Tian, Chengbo Shen, Yaojun Qin, Menghan Huang, Shuming Kang, Shunqi Li, Xuan Liu, Ying Yu, Zulong Mo, Bingyu Jiang, Yafeng Ye, Shan Li

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Abstract

Auxin has emerged as a crucial regulator of plant nitrogen (N)-use efficiency (NUE) through indirect effects on plant growth and development and direct regulation of N metabolism-related genes.
We previously reported DULL NITROGEN RESPONSE1 (DNR1) as an amino transferase that inhibits auxin accumulation and negatively regulates rice (Oryza sativa) NUE and grain yield. However, the identities of molecular regulators acting upstream of DNR1 await exploration.
Our current work identifies SUPPRESSOR OF DNR1 ON CHROMOSOME 5 (SOD5) from a DNR1 suppressor mutant. SOD5 encodes a v-myb avian myeloblastosis viral oncogene homolog (MYB) transcription factor that directly binds to the DNR1 promoter, activating its expression and further repressing auxin accumulation.
Knocking out SOD5 significantly increases NUE and grain yield, especially under low N conditions. Therefore, targeting SOD5 offers a promising strategy for enhancing crop performance, supporting the development of crops better suited for sustainable agriculture.

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SOD5通过改变生长素水平调控氮素利用效率和粮食产量的新发现

生长素通过对植物生长发育的间接影响和对氮代谢相关基因的直接调控，成为植物氮素利用效率（NUE）的重要调控因子。我们之前报道过DULL NITROGEN RESPONSE1 （DNR1）作为一种氨基转移酶，可以抑制生长素积累并负调控水稻（Oryza sativa）的氮素利用效率和籽粒产量。然而，作用于DNR1上游的分子调节因子的身份有待探索。我们目前的工作是从DNR1抑制基因突变体中鉴定出5号染色体上的DNR1抑制基因（SOD5）。SOD5编码v-myb禽成髓细胞病病毒癌基因同源（MYB）转录因子，该转录因子直接结合DNR1启动子，激活其表达并进一步抑制生长素积累。除SOD5显著提高氮肥利用效率和粮食产量，特别是在低氮条件下。因此，针对SOD5提供了一种有希望的提高作物性能的策略，支持更适合可持续农业的作物的发展。

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来源期刊

New Phytologist 生物-植物科学

自引率

5.30%

发文量

728

期刊介绍： New Phytologist is an international electronic journal published 24 times a year. It is owned by the New Phytologist Foundation, a non-profit-making charitable organization dedicated to promoting plant science. The journal publishes excellent, novel, rigorous, and timely research and scholarship in plant science and its applications. The articles cover topics in five sections: Physiology & Development, Environment, Interaction, Evolution, and Transformative Plant Biotechnology. These sections encompass intracellular processes, global environmental change, and encourage cross-disciplinary approaches. The journal recognizes the use of techniques from molecular and cell biology, functional genomics, modeling, and system-based approaches in plant science. Abstracting and Indexing Information for New Phytologist includes Academic Search, AgBiotech News & Information, Agroforestry Abstracts, Biochemistry & Biophysics Citation Index, Botanical Pesticides, CAB Abstracts®, Environment Index, Global Health, and Plant Breeding Abstracts, and others.