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DFL1, an auxin‐responsive GH3 gene homologue, negatively regulates shoot cell elongation and lateral root formation, and positively regulates the light response of hypocotyl length

DFL1, an auxin‐responsive GH3 gene homologue, negatively regulates shoot cell elongation and... A novel dominant mutant designated ‘dwarf in light 1’ (dfl1‐D) was isolated from screening around 1200 Arabidopsis activation‐tagged lines. dfl1‐D has a shorter hypocotyl under blue, red and far‐red light, but not in darkness. Inhibition of cell elongation in shoots caused an exaggerated dwarf phenotype in the adult plant. The lateral root growth of dfl1‐D was inhibited without any reduction of primary root length. The genomic DNA adjacent to the right border of T‐DNA was cloned by plasmid rescue. The rescued genomic DNA contained a gene encoding a GH3 homologue. The transcript was highly accumulated in the dfl1‐D. The dfl1‐D phenotype was confirmed by over‐expression of the gene in the wild‐type plant. The dfl1‐D showed resistance to exogenous auxin treatment. Moreover, over‐expression of antisense DFL1 resulted in larger shoots and an increase in the number of lateral roots. These results indicate that the gene product of DFL1 is involved in auxin signal transduction, and inhibits shoot and hypocotyl cell elongation and lateral root cell differentiation in light. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Plant Journal Wiley

DFL1, an auxin‐responsive GH3 gene homologue, negatively regulates shoot cell elongation and lateral root formation, and positively regulates the light response of hypocotyl length

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References (35)

Publisher
Wiley
Copyright
Copyright © 2001 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0960-7412
eISSN
1365-313X
DOI
10.1111/j.1365-313X.2001.00957.x
Publisher site
See Article on Publisher Site

Abstract

A novel dominant mutant designated ‘dwarf in light 1’ (dfl1‐D) was isolated from screening around 1200 Arabidopsis activation‐tagged lines. dfl1‐D has a shorter hypocotyl under blue, red and far‐red light, but not in darkness. Inhibition of cell elongation in shoots caused an exaggerated dwarf phenotype in the adult plant. The lateral root growth of dfl1‐D was inhibited without any reduction of primary root length. The genomic DNA adjacent to the right border of T‐DNA was cloned by plasmid rescue. The rescued genomic DNA contained a gene encoding a GH3 homologue. The transcript was highly accumulated in the dfl1‐D. The dfl1‐D phenotype was confirmed by over‐expression of the gene in the wild‐type plant. The dfl1‐D showed resistance to exogenous auxin treatment. Moreover, over‐expression of antisense DFL1 resulted in larger shoots and an increase in the number of lateral roots. These results indicate that the gene product of DFL1 is involved in auxin signal transduction, and inhibits shoot and hypocotyl cell elongation and lateral root cell differentiation in light.

Journal

The Plant JournalWiley

Published: Jan 1, 2001

Keywords: ; ; ; ;

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