AUXIN-BINDING-PROTEIN1 (ABP1) in phytochrome-B-controlled responses

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Effendi, Yunus; Jones, Alan M.; Scherer, Guenther F. E.: AUXIN-BINDING-PROTEIN1 (ABP1) in phytochrome-B-controlled responses. In: Journal of Experimental Botany 64 (2013), Nr. 16, S. 5065-5074. DOI: http://dx.doi.org/10.1093/jxb/ert294

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Abstract: 
The auxin receptor ABP1 directly regulates plasma membrane activities including the number of PIN-formed (PIN) proteins and auxin efflux transport. Red light (R) mediated by phytochromes regulates the steady-state level of ABP1 and auxin-inducible growth capacity in etiolated tissues but, until now, there has been no genetic proof that ABP1 and phytochrome regulation of elongation share a common mechanism for organ elongation. In far red (FR)-enriched light, hypocotyl lengths were larger in the abp1-5 and abp1/ABP1 mutants, but not in tir1-1, a null mutant of the TRANSPORT-INHIBITOR-RESPONSE1 auxin receptor. The polar auxin transport inhibitor naphthylphthalamic acid (NPA) decreased elongation in the low R: FR light-enriched white light (WL) condition more strongly than in the high red: FR light-enriched condition WL suggesting that auxin transport is an important condition for FR-induced elongation. The addition of NPA to hypocotyls grown in R-and FR-enriched light inhibited hypocotyl gravitropism to a greater extent in both abp1 mutants and in phyB-9 and phyA-211 than the wild-type hypocotyl, arguing for decreased phytochrome action in conjunction with auxin transport in abp1 mutants. Transcription of FR-enriched light-induced genes, including several genes regulated by auxin and shade, was reduced 3-5-fold in abp1-5 compared with Col and was very low in abp1/ABP1. In the phyB-9 mutant the expression of these reporter genes was 5-15-fold lower than in Col. In tir1-1 and the phyA-211 mutants shade-induced gene expression was greatly attenuated. Thus, ABP1 directly or indirectly participates in auxin and light signalling.
License of this version: CC BY 3.0
Document Type: article
Publishing status: publishedVersion
Issue Date: 2013-11
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
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1 image of flag of Germany Germany 73 79.35%
2 image of flag of United States United States 4 4.35%
3 image of flag of Russian Federation Russian Federation 4 4.35%
4 image of flag of France France 2 2.17%
5 image of flag of Czech Republic Czech Republic 2 2.17%
6 image of flag of Taiwan Taiwan 1 1.09%
7 image of flag of Turkey Turkey 1 1.09%
8 image of flag of United Kingdom United Kingdom 1 1.09%
9 image of flag of Ecuador Ecuador 1 1.09%
10 image of flag of China China 1 1.09%
    other countries 2 2.17%

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