Journal
NEW PHYTOLOGIST
Volume 213, Issue 4, Pages 1682-1696Publisher
WILEY
DOI: 10.1111/nph.14300
Keywords
Arabidopsis thaliana; FAR-RED-IMPAIRED RESPONSE1 (FAR1); FAR-RED ELONGATED HYPOCOTYLS3 (FHY3); ISOAMYLASE2 (ISA2); light signal proteins; starch synthesis
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Funding
- National Natural Science Foundation of China [31670249, 31271309]
- 1000-Talents Plan for young researchers of China
- Outstanding Young Scientist Award Fund [JQ201208]
- Taishan Scholar Program of Shandong Provincial Government
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In living organisms, daily light/dark cycles profoundly affect cellular processes. In plants, optimal growth and development, and adaptation to daily light-dark cycles, require starch synthesis and turnover. However, the underlying molecular mechanisms coordinating daily starch metabolism remain poorly understood. To explore the roles of Arabidopsis thaliana light signal transduction proteins FAR-RED ELONGATED HYPOCOTYLS3 (FHY3) and FAR-RED-IMPAIRED RESPONSE1 (FAR1) in starch metabolism, the contents of starch and water-soluble polysaccharides, and the structure of starch granules were investigated in fhy3, far1 and fhy3 far1 mutant plants. Disruption of FHY3 or FAR1 reduced starch accumulation and altered starch granule structure in the fhy3-4, far1-2, and fhy3-4 far1-2 mutant plants. Furthermore, molecular and genetic evidence revealed that the gene encoding the starch-debranching enzyme ISOAMYLASE2 (ISA2) is a direct target of FHY3 and FAR1, and functions in light-induced starch synthesis. Our data establish the first molecular link between light signal transduction and starch synthesis, suggesting that the light-signaling proteins FHY3 and FAR1 influence starch synthesis and starch granule formation through transcriptional activation of ISA2.
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