Ge, Yanhua and Yan, Fenglian and Zourelidou, Melina and Wang, Meiling and Ljung, Karin and Fastner, Astrid and Hammes, Ulrich Z. and Di Donato, Martin and Geisler, Markus and Schwechheimer, Claus and Tao, Yi (2017) SHADE AVOIDANCE 4 Is Required for Proper Auxin Distribution in the Hypocotyl. PLANT PHYSIOLOGY, 173 (1). pp. 788-800. ISSN 0032-0889, 1532-2548
Full text not available from this repository. (Request a copy)Abstract
The phytohormone auxin is involved in virtually every aspect of plant growth and development. Through polar auxin transport, auxin gradients can be established, which then direct plant differentiation and growth. Shade avoidance responses are well-known processes that require polar auxin transport. In this study, we have identified a mutant, shade avoidance 4 (sav4), defective in shade-induced hypocotyl elongation and basipetal auxin transport. SAV4 encodes an unknown protein with armadillo repeatand tetratricopeptide repeat-like domains known to provide protein-protein interaction surfaces. C terminally yellow fluorescent protein-tagged SAV4 localizes to both the plasma membrane and the nucleus. Membrane-localized SAV4 displays a polar association with the shootward plasma membrane domain in hypocotyl and root cells, which appears to be necessary for its function in hypocotyl elongation. Cotransfection of SAV4 and ATP-binding cassette B1 (ABCB1) auxin transporter in tobacco (Nicotiana benthamiana) revealed that SAV4 blocks ABCB1-mediated auxin efflux. We thus propose that polarly localized SAV4 acts to inhibit ABCB-mediated auxin efflux toward shoots and facilitates the establishment of proper auxin gradients.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | D6 PROTEIN-KINASE; PLASMA-MEMBRANE; FUNCTIONALLY INTERACTS; ARABIDOPSIS-THALIANA; MEDIATED DEVELOPMENT; PLANT DEVELOPMENT; TWISTED DWARF1; TRANSPORT; PIN; EFFLUX; |
| Subjects: | 500 Science > 580 Botanical sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 12:58 |
| Last Modified: | 22 Feb 2019 10:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/91 |
Actions (login required)
 |
View Item |
