期刊
PLANT CELL
卷 25, 期 5, 页码 1709-1725出版社
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.113.112052
关键词
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资金
- Ministry of Agriculture, Forestry, and Fisheries of Japan [MP-2146, IP-5002, AMR0002, AMR0004]
- Bio-oriented Technology Research Advancement Institute of Japan
- Japan Society for the Promotion of Science KAKENHI [24580493, 21.5771]
- Japan Society for the Promotion of Science
- Grants-in-Aid for Scientific Research [24580493, 24580016] Funding Source: KAKEN
Plasticity of root growth in response to environmental cues and stresses is a fundamental characteristic of land plants. However, the molecular basis underlying the regulation of root growth under stressful conditions is poorly understood. Here, we report that a rice nuclear factor, RICE SALT SENSITIVE3 (RSS3), regulates root cell elongation during adaptation to salinity. Loss of function of RSS3 only moderately inhibits cell elongation under normal conditions, but it provokes spontaneous root cell swelling, accompanied by severe root growth inhibition, under saline conditions. RSS3 is preferentially expressed in the root tip and forms a ternary complex with class-C basic helix-loop-helix (bHLH) transcription factors and JASMONATE ZIM-DOMAIN proteins, the latter of which are the key regulators of jasmonate (JA) signaling. The mutated protein arising from the rss3 allele fails to interact with bHLH factors, and the expression of a significant portion of JA-responsive genes is upregulated in rss3. These results, together with the known roles of JAs in root growth regulation, suggest that RSS3 modulates the expression of JA-responsive genes and plays a crucial role in a mechanism that sustains root cell elongation at appropriate rates under stressful conditions.
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