FIN5 positively regulates far-red light responses in Arabidopsis thaliana.
Plant Cell Physiol
; 44(6): 565-72, 2003 Jun.
Article
in En
| MEDLINE
| ID: mdl-12826621
ABSTRACT
We report the characterization of a semi-dominant mutation fin5-1 (far-red insensitive 5-1) of Arabidopsis, which was isolated from genetic screening of phytochrome A (phyA) signaling components. Plants with the fin5-1 mutation exhibited a long hypocotyl phenotype when grown under far-red (FR) light, but not under red light. Physiological analyses implied that FIN5 might be differentially involved in diverse responses that are regulated by phyA under continuous FR light. Anthocyanin accumulation, gravitropic response of hypocotyl growth, and FR light-preconditioned blocking of greening were also impaired in the fin5-1 mutant, whereas photoperiodic floral induction was not, if at all, significantly affected. Moreover, light-regulated expression of the CHS, PORA and PsbS genes was attenuated in fin5-1 mutant plants, while the light-induced expression of CAB was normal. The mutation exhibited semi-dominance regarding control of hypocotyl growth in FR light. We suggest that FIN5 defines a novel branch in the network of phyA signaling in Arabidopsis.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Phytochrome
/
Plant Proteins
/
Acyltransferases
/
Arabidopsis
/
Arabidopsis Proteins
/
Light-Harvesting Protein Complexes
/
Photosystem II Protein Complex
/
Light
/
Mutation
Language:
En
Journal:
Plant Cell Physiol
Journal subject:
BOTANICA
Year:
2003
Document type:
Article