Biosynthesis of DHGA12 and its roles in Arabidopsis seedling establishment

Hao Liu, Siyi Guo, Minghua Lu, Yu Zhang, Junhua Li, Wei Wang, Pengtao Wang, Junli Zhang, Zhubing Hu, Liangliang Li, Lingyu Si, Jie Zhang, Qi Qi, Xiangning Jiang, José Ramón Botella, Hua Wang and Chun-Peng Song ()
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Hao Liu: Henan University
Siyi Guo: Henan University
Minghua Lu: Henan University
Yu Zhang: Henan University
Junhua Li: Henan Normal University
Wei Wang: Henan University
Pengtao Wang: Henan University
Junli Zhang: Henan University
Zhubing Hu: Henan University
Liangliang Li: Henan University
Lingyu Si: Henan University
Jie Zhang: Henan University
Qi Qi: Beijing Forestry University
Xiangning Jiang: Beijing Forestry University
José Ramón Botella: Henan University
Hua Wang: Henan University
Chun-Peng Song: Henan University

Nature Communications, 2019, vol. 10, issue 1, 1-14

Abstract: Abstract Seed germination and photoautotrophic establishment are controlled by the antagonistic activity of the phytohormones gibberellins (GAs) and abscisic acid (ABA). Here we show that Arabidopsis thaliana GAS2 (Gain of Function in ABA-modulated Seed Germination 2), a protein belonging to the Fe-dependent 2-oxoglutarate dioxygenase superfamily, catalyzes the stereospecific hydration of GA12 to produce GA12 16, 17-dihydro-16α-ol (DHGA12). We show that DHGA12, a C20-GA has an atypical structure compared to known active GAs but can bind to the GA receptor (GID1c). DHGA12 can promote seed germination, hypocotyl elongation and cotyledon greening. Silencing and over-expression of GAS2 alters the ABA/GA ratio and sensitivity to ABA during seed germination and photoautotrophic establishment. Hence, we propose that GAS2 acts to modulate hormonal balance during early seedling development.

Date: 2019
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DOI: 10.1038/s41467-019-09467-5

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