Auxins are postulated to be one of the pivotal factors in nodulation. However, their transporters in , the model species for the study of the development of determinate-type root nodules, have been scarcely described so far, and thus their role in nodulation has remained unknown. Our research is the first focusing on polar auxin transporters in . We analyzed and compared expression of in 20 days post rhizobial inoculation (dpi) and 54 dpi root nodules of by real-time quantitative polymerase chain reaction (qPCR) along with the histochemical β-glucuronidase () reporter gene assay in transgenic hairy roots. The results indicate that are essential during root nodule development since they are predominantly expressed in the primordia and young, developing nodules. However, along with differentiation, expression levels of several decreased and occurred particularly in the nodule vascular bundles, especially in connection with the root's stele. Moreover, our study demonstrated the importance of both polar auxin transport and auxin intracellular homeostasis during root nodule development and differentiation.
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| http://dx.doi.org/10.3390/ijms20020235 | DOI Listing |
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