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- Title
Involvement of STH7 in light-adapted development in Arabidopsis thaliana promoted by both strigolactone and karrikin.
- Authors
Thussagunpanit, Jutiporn; Nagai, Yuko; Nagae, Miyu; Mashiguchi, Kiyoshi; Mitsuda, Nobutaka; Ohme-Takagi, Masaru; Nakano, Takeshi; Nakamura, Hidemitsu; Asami, Tadao
- Abstract
Strigolactones (SLs) and karrikins (KARs) regulate photomorphogenesis. GR24, a synthetic SL and KAR1, a KAR, inhibit the hypocotyl elongation ofArabidopsis thalianain a weak light. GR24 and KAR1up-regulate the expression ofSTH7, encoding a transcription factor belonging to the double B-box zinc finger subfamily. In this study, we usedSTH7-overexpressing (STH7ox) lines and functionally defectiveSTH7(STH7-SRDX) mutants to investigate roles of SLs and KARs in photomorphogenesis ofArabidopsis. Hypocotyl elongation ofSTH7-SRDXmutants was less sensitive to both GR24 and KAR1treatment than that of wild-typeArabidopsisunder weak light conditions. Furthermore, the chlorophyll and anthocyanin content was increased inSTH7oxlines when de-etiolated with light and GR24-treated plants had enhanced anthocyanin production. GR24 and KAR1treatment significantly increased the expression level of photosynthesis-related genesLHCB1andrbcS. The results strongly suggest that SL and KAR induce photomorphogenesis ofArabidopsisin an STH7-dependent manner. Strigolactone response is mediated by D14 and KAI2 while karrikin response is mediated by only KAI2.
- Subjects
ARABIDOPSIS thaliana; STRIGOLACTONES; PLANT photomorphogenesis; PHYSIOLOGY
- Publication
Bioscience, Biotechnology & Biochemistry, 2017, Vol 81, Issue 2, p292
- ISSN
0916-8451
- Publication type
Article
- DOI
10.1080/09168451.2016.1254536