UV-B irradiation-activated E3 ligase GmILPA1 modulates gibberellin catabolism to increase plant height in soybean

Jiaqi Sun, Shiyu Huang, Qing Lu, Shuo Li, Shizhen Zhao, Xiaojian Zheng, Qian Zhou, Wenxiao Zhang, Jie Li, Lili Wang, Ke Zhang, Wenyu Zheng, Xianzhong Feng (), Baohui Liu (), Fanjiang Kong () and Fengning Xiang ()
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Jiaqi Sun: Shandong University
Shiyu Huang: Shandong University
Qing Lu: Shandong University
Shuo Li: Shandong University
Shizhen Zhao: Shandong University
Xiaojian Zheng: Shandong University
Qian Zhou: Shandong University
Wenxiao Zhang: Shandong University
Jie Li: Shandong University
Lili Wang: Shandong University
Ke Zhang: Shandong University
Wenyu Zheng: Shandong University
Xianzhong Feng: Chinese Academy of Sciences
Baohui Liu: Guangzhou University
Fanjiang Kong: Guangzhou University
Fengning Xiang: Shandong University

Nature Communications, 2023, vol. 14, issue 1, 1-17

Abstract: Abstract Plant height is a key agronomic trait that affects yield and is controlled by both phytohormone gibberellin (GA) and ultraviolet-B (UV-B) irradiation. However, whether and how plant height is modulated by UV-B-mediated changes in GA metabolism are not well understood. It has not been reported that the E3 ubiquitin ligase Anaphase Promoting Complex/Cyclosome (APC/C) is involved in the regulation of plant growth in response to environmental factors. We perform a forward genetic screen in soybean and find that a mutation in Glycine max Increased Leaf Petiole Angle1 (GmILPA1), encoding a subunit of the APC/C, lead to dwarfism under UV-B irradiation. UV-B promotes the accumulation of GmILPA1, which ubiquitinate the GA catabolic enzyme GA2 OXIDASE-like (GmGA2ox-like), resulting in its degradation in a UV-B-dependent manner. Another E3 ligase, GmUBL1, also ubiquitinate GmGA2ox-like and enhance the GmILPA1-mediated degradation of GmGA2ox-like, which suggest that GmILPA1-GmGA2ox-like module counteract the UV-B-mediated reduction of bioactive GAs. We also determine that GmILPA1 is a target of selection during soybean domestication and breeding. The deletion (Indel-665) in the promoter might facilitate the adaptation of soybean to high UV-B irradiation. This study indicates that an evolutionary GmILPA1 variant has the capability to develop ideal plant architecture with soybean cultivars.

Date: 2023
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DOI: 10.1038/s41467-023-41824-3

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