NDLI: The Arabidopsis E3 ubiquitin ligase HOS1 contributes to auxin biosynthesis in the control of hypocotyl elongation

Content Provider	Springer Nature Link
Author	Lee, Kyounghee Seo, Pil Joon
Copyright Year	2014
Abstract	Photomorphogenesis is a key developmental process involving numerous developmental and physiological changes in response to light, including inhibition of hypocotyl elongation. Light-dependent hypocotyl development is intensively regulated by all plant hormones. In agreement with this, a number of hormone metabolic and signaling components are involved in the light regulation of plant morphogenesis. Here, we report that the RING finger-containing E3 ubiquitin ligase HIGH EXPRESSION OF OSMOTICALLY RESPONSIVE GENES1 (HOS1) negatively regulates auxin biosynthesis in the control of hypocotyl elongation in Arabidopsis. The HOS1-deficient mutants exhibited a long hypocotyl in light conditions but a short hypocotyl in the dark, as observed in auxin-overproducing mutants. We found that auxin biosynthetic genes, such as YUCCAs (YUCs), TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS 1, and CYP79B2, were up-regulated in the hos1–3 mutant, and endogenous auxin levels were accordingly increased. Furthermore, the long hypocotyl phenotype of light-grown hos1–3 seedlings was rescued by the application of auxin transport inhibitors, 1-naphthylphthalamic acid and 2,3,5-triiodobenzoic acid. Taken together, our data demonstrate that HOS1 modulates auxin biosynthesis and probably links light and auxin signaling in the control of hypocotyl elongation.
Starting Page	157
Ending Page	165
Page Count	9
File Format	PDF
ISSN	01676903
Journal	Plant Growth Regulation
Volume Number	76
Issue Number	2
e-ISSN	15735087
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-10-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arabidopsis Auxin HOS1 Hypocotyl Light Plant Sciences Plant Anatomy/Development Plant Physiology Agriculture
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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