Involvement of STH7 in light-adapted development in Arabidopsis thaliana promoted by both strigolactone and karrikin.
Biosci Biotechnol Biochem
; 81(2): 292-301, 2017 Feb.
Article
em En
| MEDLINE
| ID: mdl-27858514
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 KAR1 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 KAR1 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 KAR1 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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MEDLINE
Assunto principal:
Piranos
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Fatores de Transcrição
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Adaptação Fisiológica
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Arabidopsis
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Proteínas de Arabidopsis
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Furanos
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Lactonas
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Luz
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article