title: Involvement of STH7 in light-adapted development in Arabidopsis thaliana promoted by both strigolactone and karrikin.
abstract: Strigolactones (SLs) and karrikins (KARs) regulate photomorphogenesis. GR24, a synthetic SL and KAR1, a KAR, inhibit the hypocotyl elongation of Arabidopsis thaliana in a weak light. GR24 and KAR1up-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 KAR1treatment 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 KAR1treatment 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.
authors.affiliation: a Graduate School of Agricultural and Life Sciences , The University of Tokyo , Tokyo , Japan.
authors.forename: Jutiporn
authors.initials: J
authors.lastname: Thussagunpanit
authors.affiliation: a Graduate School of Agricultural and Life Sciences , The University of Tokyo , Tokyo , Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Nagai
authors.affiliation: a Graduate School of Agricultural and Life Sciences , The University of Tokyo , Tokyo , Japan.
authors.forename: Miyu
authors.initials: M
authors.lastname: Nagae
authors.affiliation: b Graduate School of Life Sciences , Tohoku University , Sendai , Japan.
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Mashiguchi
authors.affiliation: c Bioproduction Research Institute , National Institute of Advanced Industrial Science and Technology , Tsukuba , Japan.
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Mitsuda
authors.affiliation: c Bioproduction Research Institute , National Institute of Advanced Industrial Science and Technology , Tsukuba , Japan.|d Graduate School of Science and Engineering , Saitama University , Saitama , Japan.
authors.forename: Masaru
authors.initials: M
authors.lastname: Ohme-Takagi
authors.affiliation: e Gene Discovery Research Group , RIKEN Center for Sustainable Research Science , Saitama , Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nakano
authors.affiliation: a Graduate School of Agricultural and Life Sciences , The University of Tokyo , Tokyo , Japan.
authors.forename: Hidemitsu
authors.initials: H
authors.lastname: Nakamura
authors.affiliation: a Graduate School of Agricultural and Life Sciences , The University of Tokyo , Tokyo , Japan.|f Faculty of Science, Department of Biochemistry , King Abdulaziz University , Jeddah , Saudi Arabia.
authors.forename: Tadao
authors.initials: T
authors.lastname: Asami
mesh_terms: D000222:Adaptation, Physiological / Q000187:drug effects / Q000528:radiation effects*; D000872:Anthocyanins / Q000378:metabolism; D017360:Arabidopsis / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism* / Q000528:radiation effects; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D002734:Chlorophyll / Q000378:metabolism; D005663:Furans / Q000494:pharmacology*; D018546:Hypocotyl / Q000187:drug effects / Q000254:growth & development / Q000528:radiation effects; D007783:Lactones / Q000494:pharmacology*; D008027:Light; D009154:Mutation; D010788:Photosynthesis / Q000187:drug effects / Q000235:genetics / Q000528:radiation effects; D063245:Plant Development / Q000187:drug effects / Q000528:radiation effects; D011714:Pyrans / Q000494:pharmacology*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*
chemical_list: C488803:3-methyl-2H-furo(2,3-c)pyran-2-one; D000872:Anthocyanins; D029681:Arabidopsis Proteins; C574877:At4g39070 protein, Arabidopsis; D005663:Furans; C507382:GR24 compound; D007783:Lactones; D011714:Pyrans; D014157:Transcription Factors; D002734:Chlorophyll
keywords: Arabidopsis thaliana; double B-box zinc finger; karrikin; photomorphogenesis; strigolactone