Chrysanthemum MAF2 regulates flowering by repressing gibberellin biosynthesis in response to low temperature.
Plant J
; 112(5): 1159-1175, 2022 12.
Article
em En
| MEDLINE
| ID: mdl-36214418
ABSTRACT
Chrysanthemum (Chrysanthemum morifolium) is well known as a photoperiod-sensitive flowering plant. However, it has also evolved into a temperature-sensitive ecotype. Low temperature can promote the floral transition of the temperature-sensitive ecotype, but little is known about the underlying molecular mechanisms. Here, we identified MADS AFFECTING FLOWERING 2 (CmMAF2), a putative MADS-box gene, which induces floral transition in response to low temperatures independent of day length conditions in this ecotype. CmMAF2 was shown to bind to the promoter of the GA biosynthesis gene CmGA20ox1 and to directly regulate the biosynthesis of bioactive GA1 and GA4 . The elevated bioactive GA levels activated LEAFY (CmLFY) expression, ultimately initiating floral transition. In addition, CmMAF2 expression in response to low temperatures was directly activated by CmC3H1, a CCCH-type zinc-finger protein upstream. In summary, our results reveal that the CmC3H1-CmMAF2 module regulates flowering time in response to low temperatures by regulating GA biosynthesis in the temperature-sensitive chrysanthemum ecotype.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Chrysanthemum
Idioma:
En
Revista:
Plant J
Assunto da revista:
BIOLOGIA MOLECULAR
/
BOTANICA
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
China