Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 22, Issue 16, Pages -Publisher
MDPI
DOI: 10.3390/ijms22168495
Keywords
legumes; root elongation; auxin; signaling; nodulation
Funding
- CNR project FOE-2019 [DBA.AD003.139]
- European Community, Horizon 2020, PRIMA (Partnership for Research and Innovation in the Mediterranean Area)
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The LjAFB6 gene is preferentially expressed in the aerial portion of L. japonicus plants and is induced in response to nitrate supply in roots. It plays a specialized role in regulating primary and lateral root elongation processes in response to auxin, but is not involved in the nodulation process.
Auxin is essential for root development, and its regulatory action is exerted at different steps from perception of the hormone up to transcriptional regulation of target genes. In legume plants there is an overlap between the developmental programs governing lateral root and N-2-fixing nodule organogenesis, the latter induced as the result of the symbiotic interaction with rhizobia. Here we report the characterization of a member of the L. japonicus TIR1/AFB auxin receptor family, LjAFB6. A preferential expression of the LjAFB6 gene in the aerial portion of L. japonicus plants was observed. Significant regulation of the expression was not observed during the symbiotic interaction with Mesorhizobium loti and the nodule organogenesis process. In roots, the LjAFB6 expression was induced in response to nitrate supply and was mainly localized in the meristematic regions of both primary and lateral roots. The phenotypic analyses conducted on two independent null mutants indicated a specialized role in the control of primary and lateral root elongation processes in response to auxin, whereas no involvement in the nodulation process was found. We also report the involvement of LjAFB6 in the hypocotyl elongation process and in the control of the expression profile of an auxin-responsive gene.
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