Two dominant photomorphogenic mutations of Arabidopsis thaliana identified as suppressor mutations of hy2
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SCOPUS
- Title
- Two dominant photomorphogenic mutations of Arabidopsis thaliana identified as suppressor mutations of hy2
- Authors
- Kim, BC; Soh, MS; Kang, BJ; Furuya, M; Nam, HG
- Date Issued
- 1996-04
- Publisher
- BLACKWELL SCIENCE LTD
- Abstract
- By screening suppressor mutants of the hy2 mutation of Arabidopsis thaliana, two dominant photomorphogenic mutants, shy1-1D and shy2-1D, for two genetic loci designated as SHY1 and SHY2 (suppressor of hy2 mutation) have been isolated. Both of these non-allelic, extragenic suppressor mutations of hy2 are located on chromosome 1 of the Arabidopsis genome. Both mutations suppress the elongated hypocotyl phenotype of hy2 by light-independent inhibition of hypocotyl growth as well as by increasing the effectiveness of light inhibition of hypocotyl elongation. The shy1-1D mutation is partially photomorphogenic in darkness with apical hook opening and reduced hypocotyl elongation. The shy2-1D mutant displays highly photomorphogenic characteristics in darkness such as true leaf development, cotyledon expansion, and extremely reduced hypocotyl growth. In regard to hypocotyl elongation, however, the shy2-1D mutation is still light sensitive. Examination of red/far-red light responses shows that the shy1-1D mutation suppresses the hypocotyl elongation of the hy2 mutation effectively in red light but not effectively in far-red light. The shy2-1D suppresses hypocotyl elongation of the hy2 mutation effectively in both red and far-red light. Both mutations can also suppress the early-flowering phenotype of hy2 and have a distinct pleiotropic effect on leaf development such as upward leaf rolling. The data obtained suggest that SHY1 and SHY2 represent a novel class of components involved in the photomorphogenic pathways of Arabidopsis. This is the first report on the identification of dominant mutations in the light signal transduction pathway of plants.
- Keywords
- LONG-HYPOCOTYL MUTANTS; PHYTOCHROME-A; MEDIATED TRANSFORMATION; ACTION SPECTRA; LIGHT; PLANTS; GENE; INHIBITION; ELONGATION; DEFICIENT
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21602
- DOI
- 10.1046/j.1365-313X.1996.09040441.x
- ISSN
- 0960-7412
- Article Type
- Article
- Citation
- PLANT JOURNAL, vol. 9, no. 4, page. 441 - 456, 1996-04
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