ISSN:
1432-2048
Keywords:
Arabidopsis (hy4 mutant)
;
Blue-light
;
Mu-tant (Arabidopsis)
;
Photomorphogenesis
;
Flavonoid biosynthesis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The hy4 mutant of Arabidopsis thaliana(L.) Heynh. was previously shown to be impaired in the suppression of hypocotyl extension specifically by blue light. We report here that hy4 is altered in a range of blue-light-mediated extension-growth responses in various organs in seedlings and mature plants: it shows greater length of bolted stems, increased petiole extension and increased leaf width and area in blue light compared to the wild type. The hy4 mutant shows decreased cotyledon expansion in both red and blue light compared to the wild type. Anthocyanin formation and the expression of several flavonoid biosynthesis genes is stimulated by blue light in the wild type but to a much lower extent in hy4. The results indicate that the HY4 gene product is concerned with the perception of blue light in a range of extension-growth and gene-expression responses in Arabidopsis.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00202642
