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

Journal Article · · Journal of Experimental Botany
DOI:https://doi.org/10.1093/jxb/ert294· OSTI ID:1625379
 [1];  [2];  [1]
  1. Leibniz Univ. Hannover (Germany). Inst. fur Zierpflanzenbau und Geholzforschung. Abt. Molekulare Ertagsphysiologie
  2. Univ. of North Carolina, Chapel Hill, NC (United States). Depts. of Biology and Pharmacology

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.

Research Organization:
University of North Carolina, Chapel Hill, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-05ER15671
OSTI ID:
1625379
Journal Information:
Journal of Experimental Botany, Vol. 64, Issue 16; ISSN 0022-0957
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Complementation of the embryo-lethal T-DNA insertion mutant of AUXIN-BINDING-PROTEIN 1 (ABP1) with abp1 point mutated versions reveals crosstalk of ABP1 and phytochromes journal November 2014
Regulation of developmental and environmental signaling by interaction between microtubules and membranes in plant cells journal December 2015
Auxin binding protein 1 (ABP1) is not required for either auxin signaling or Arabidopsis development journal February 2015
Transcription of TIR1-Controlled Genes Can be Regulated within 10 Min by an Auxin-Induced Process. Can TIR1 be the Receptor? text January 2016
Revisiting Apoplastic Auxin Signaling Mediated by AUXIN BINDING PROTEIN 1 journal October 2015