Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 81, Issue 2, Pages 292-301Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09168451.2016.1254536
Keywords
Arabidopsis thaliana; strigolactone; karrikin; double B-box zinc finger; photo-morphogenesis
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Funding
- CREST
- JST
- JSPS KAKENHI [26440132]
- Deanship of Scientific Research (DSR), at King Abdulaziz University, Jeddah [1-130-36-HiCi]
- Grants-in-Aid for Scientific Research [15K14714, 26440132, 26520303, 15H05623] Funding Source: KAKEN
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Strigolactones (SLs) and karrikins (KARs) regulate photomorphogenesis. GR24, a synthetic SL and KAR(1), a KAR, inhibit the hypocotyl elongation of Arabidopsis thaliana in a weak light. GR24 and KAR(1) up-regulate the expression of STH7, encoding a transcription factor belonging to the double B-box zinc finger subfamily. In this study, we used STH7-overexpressing (STH7ox) lines and functionally defective STH7 (STH7-SRDX) mutants to investigate roles of SLs and KARs in photomorphogenesis of Arabidopsis. Hypocotyl elongation of STH7-SRDX mutants was less sensitive to both GR24 and KAR(1) treatment than that of wild-type Arabidopsis under weak light conditions. Furthermore, the chlorophyll and anthocyanin content was increased in STH7ox lines when de-etiolated with light and GR24-treated plants had enhanced anthocyanin production. GR24 and KAR(1) treatment significantly increased the expression level of photosynthesis-related genes LHCB1 and rbcS. The results strongly suggest that SL and KAR induce photomorphogenesis of Arabidopsis in an STH7-dependent manner.
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