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      Auxin-induced expression divergence between Arabidopsis species may originate within the TIR1/AFB-AUX/IAA-ARF module.

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          Abstract

          Auxin is an essential regulator of plant growth and development, and auxin signaling components are conserved among land plants. Yet, a remarkable degree of natural variation in physiological and transcriptional auxin responses has been described among Arabidopsis thaliana accessions. As intraspecies comparisons offer only limited genetic variation, we here inspect the variation of auxin responses between A. thaliana and A. lyrata. This approach allowed the identification of conserved auxin response genes including novel genes with potential relevance for auxin biology. Furthermore, promoter divergences were analyzed for putative sources of variation. De novo motif discovery identified novel and variants of known elements with potential relevance for auxin responses, emphasizing the complex, and yet elusive, code of element combinations accounting for the diversity in transcriptional auxin responses. Furthermore, network analysis revealed correlations of interspecies differences in the expression of AUX/IAA gene clusters and classic auxin-related genes. We conclude that variation in general transcriptional and physiological auxin responses may originate substantially from functional or transcriptional variations in the TIR1/AFB, AUX/IAA, and ARF signaling network. In that respect, AUX/IAA gene expression divergence potentially reflects differences in the manner in which different species transduce identical auxin signals into gene expression responses.

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          Author and article information

          Journal
          J. Exp. Bot.
          Journal of experimental botany
          Oxford University Press (OUP)
          1460-2431
          0022-0957
          January 01 2017
          : 68
          : 3
          Affiliations
          [1 ] Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Betty-Heimann, Halle (Saale), Germany.
          [2 ] Department of Molecular Signal Processing, Leibniz Institute of Plant Biochemistry, Weinberg 3, Halle (Saale), Germany.
          [3 ] German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, Leipzig, Germany.
          [4 ] Institute of Computer Science, Martin Luther University Halle-Wittenberg, Von-Seckendorff-Platz 1,Halle (Saale), Germany.
          Article
          erw457
          10.1093/jxb/erw457
          28007950
          8efcdeab-f394-41c4-b960-60d5d7066019
          History

          profile interaction finder,Arabidopsis,auxin,auxin code,comparative transcriptomics,natural variation,promoter motif

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