Nitrate responses of Arabidopsis cho1 mutants: obvious only when excess nitrate is supplied.
Plant Signal Behav
; 4(12): 1166-8, 2009 Dec.
Article
em En
| MEDLINE
| ID: mdl-20514237
ABSTRACT
We reported a loss-of-function of an Arabidopsis double AP2 transcription factor CHOTTO1 (CHO1) gene results in the altered responses to high concentrations of nitrate (approximately 50 mM). Nitrate up to 10 mM promotes growth of the wildtype seedling, but inhibits it under higher concentrations. The cho1 seedlings responded to nitrate up to 10 mM similarly to the wildtype, but the inhibitory effect of excess nitrate is less prominent in the mutants. This phenotype is restricted to the cotyledons, and growth of the hypocotyl and roots of the cho1 mutants is inhibited by excess nitrate. The cho1 mutations caused the upregulation of two nitrate transporter genes, AtNRT1.4 and At1g52190. Altered nitrate distribution and storage may explain the phenotypes of the cho1 mutants.
Texto completo:
1
Base de dados:
MEDLINE
Idioma:
En
Revista:
Plant Signal Behav
Assunto da revista:
BOTANICA
/
FISIOLOGIA
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
Canadá