AI Article Synopsis
- The antagonistic roles of gibberellins (GAs) and abscisic acid (ABA) regulate seed germination and growth in plants like Arabidopsis thaliana.
- GAS2, a protein that functions in this process, converts GAs into a new compound called DHGA, which can still activate the GA receptor.
- By altering GA and ABA levels through manipulating GAS2 expression, this research suggests that GAS2 helps balance these hormones during the early stages of a seedling’s development.
Article 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 GA to produce GA 16, 17-dihydro-16α-ol (DHGA). We show that DHGA, a C-GA has an atypical structure compared to known active GAs but can bind to the GA receptor (GID1c). DHGA 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.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6467921 | PMC |
| http://dx.doi.org/10.1038/s41467-019-09467-5 | DOI Listing |
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