Journal
ADVANCED SCIENCE
Volume 7, Issue 3, Pages -Publisher
WILEY
DOI: 10.1002/advs.201901455
Keywords
Arabidopsis; PIN phosphorylation; PP2A; PYLs; root adaptation
Categories
Funding
- Ministry of Agriculture of China for Transgenic Research [2019ZX08010003-002-005]
- Beijing Municipal Natural Science Foundation [5192011]
- National Natural Science Foundation of China [31370309]
- 1000-Talents Plan from China for young researchers
- Fundamental Research Funds for the Central Universities
- open funds of the State Key Laboratory of Crop Genetics and Germplasm Enhancement [ZW201804]
- National Transgenic Major Program [2018ZX08020-003]
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Plant root architecture dynamically adapts to various environmental conditions, such as salt-containing soil. The phytohormone abscisic acid (ABA) is involved among others also in these developmental adaptations, but the underlying molecular mechanism remains elusive. Here, a novel branch of the ABA signaling pathway in Arabidopsis involving PYR/PYL/RCAR (abbreviated as PYLs) receptor-protein phosphatase 2A (PP2A) complex that acts in parallel to the canonical PYLs-protein phosphatase 2C (PP2C) mechanism is identified. The PYLs-PP2A signaling modulates root gravitropism and lateral root formation through regulating phytohormone auxin transport. In optimal conditions, PYLs ABA receptor interacts with the catalytic subunits of PP2A, increasing their phosphatase activity and thus counteracting PINOID (PID) kinase-mediated phosphorylation of PIN-FORMED (PIN) auxin transporters. By contrast, in salt and osmotic stress conditions, ABA binds to PYLs, inhibiting the PP2A activity, which leads to increased PIN phosphorylation and consequently modulated directional auxin transport leading to adapted root architecture. This work reveals an adaptive mechanism that may flexibly adjust plant root growth to withstand saline and osmotic stresses. It occurs via the cross-talk between the stress hormone ABA and the versatile developmental regulator auxin.
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