期刊
DEVELOPMENTAL CELL
卷 57, 期 20, 页码 2412-+出版社
CELL PRESS
DOI: 10.1016/j.devcel.2022.09.012
关键词
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资金
- National NaturalScience Foundation of China [31970293, 32100237]
- Strategic Priority Research Program of the ChineseAcademy of Sciences [XDB27040107]
- Science and TechnologyCommission of Shanghai Municipality [22ZR1481400]
- Shanghai Cen-ter for Plant Stress Biology, Chinese Academy of Sciences
- ARC Discovery grant [DP19001941]
- Villum Investigator [25915]
- DNRF Chair [DNRF155]
- Novo Nordisk Laureate [NNF19OC0056076]
- Novo Nordisk Emerging Investigator [NNF20OC0060564]
- Lundbeck Foundation [R346-2020-1546]
This study reveals that ABA-mediated root twisting determines the mechanism of plant root halotropism, guiding anisotropic cell expansion through microtubule reorientation and cellulose microfibril deposition for plant growth in adverse environments.
Plants have evolved signaling mechanisms that guide growth away from adverse environments that can cause yield losses. Root halotropism is a sodium-specific negative tropism that is crucial for surviving and thriving under high salinity. Although root halotropism was discovered some years ago, the underlying mo-lecular and cellular mechanisms remain unknown. Here, we show that abscisic acid (ABA)-mediated root twisting determines halotropism in Arabidopsis. An ABA-activated SnRK2 protein kinase (SnRK2.6) phos-phorylates the microtubule-associated protein SP2L at Ser406, which induces a change in the anisotropic cell expansion at the root transition zone and is required for root twisting during halotropism. Salt stress trig-gers SP2L-mediated cortical microtubule reorientation, which guides cellulose microfibril patterns. Our find-ings thus outline the molecular mechanism of root halotropism and indicate that anisotropic cell expansion through microtubule reorientation and microfibril deposition has a central role in mediating tropic responses.
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