A GmWRKY20–GmbZIP9 transcriptional module synergistically activates GmANKTM21 to confer drought tolerance in soybean

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ID: 318526
2026
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Abstract
Abstract Soybean yields are increasingly curtailed by drought; however, the native transcription factor pairs that translate water-deficit signals into a robust antioxidant response have not been fully characterized. Here, we show that CRISPR/Cas9-mediated knockout of GmWRKY20 reduces antioxidant-enzyme activities and decreases drought tolerance, confirming its essential role in soybean drought tolerance. The bZIP factor GmbZIP9, isolated as a GmWRKY20 interactor, is nuclear-localized and rapidly induced upon dehydration. Overexpression of GmbZIP9 alone elevated reactive oxygen species (ROS) scavenging capacity and enhanced drought tolerance. Critically, co-expression of GmWRKY20 and GmbZIP9 in both yeast and soybean hairy-root assays demonstrated a powerful synergistic effect, conferring superior osmotic-stress tolerance and survival under drought compared with either gene alone. We further identified GmANKTM21, encoding a plasma-membrane ankyrin-repeat protein, as the direct downstream target of this complex. The GmWRKY20-GmbZIP9 heterodimer binds directly to the GmANKTM21 promoter and synergistically drives its transcription, leading to enhanced antioxidant defense. Our findings unveil a key transcriptional regulatory module and provide a rational strategy for pyramiding GmWRKY20 and GmbZIP9 to breed drought-resilient soybean cultivars.
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openalex_W7165745202 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Shuang Jiao, Ke Zhao, Xiaohong Liu, Jianing Zhao, Rui Zhao, Yanting Dong, Longji Shan, Jianing Xun, Huibing Mu, D L Guo, Huaiyuan Qi, Jingwen Zhou, Baohui Liu, Xi Bai, Hong Zhai
Journal Plant physiology and biochemistry : PPB
Year 2026
DOI
10.1093/plphys/kiag421
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