Journal
PLANT CELL
Volume 23, Issue 9, Pages 3412-3427Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.111.089920
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Funding
- Kentucky Science and Engineering Foundation [148-502-06-189]
- Kentucky Tobacco Research and Development Center
- Grants-in-Aid for Scientific Research [23012028] Funding Source: KAKEN
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The dynamic instability of cortical microtubules (MTs) (i.e., their ability to rapidly alternate between phases of growth and shrinkage) plays an essential role in plant growth and development. In addition, recent studies have revealed a pivotal role for dynamic instability in the response to salt stress conditions. The salt stress response includes a rapid depolymerization of MTs followed by the formation of a new MT network that is believed to be better suited for surviving high salinity. Although this initial depolymerization response is essential for the adaptation to salt stress, the underlying molecular mechanism has remained largely unknown. Here, we show that the MT-associated protein SPIRAL1 (SPR1) plays a key role in salt stress-induced MT disassembly. SPR1, a microtubule stabilizing protein, is degraded by the 26S proteasome, and its degradation rate is accelerated in response to high salinity. We show that accelerated SPR1 degradation is required for a fast MT disassembly response to salt stress and for salt stress tolerance.
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