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Nitrate-responsive miR393/AFB3 regulatory module controls root system architecture in Arabidopsis thaliana

Nitrate-responsive miR393/AFB3 regulatory module controls root system architecture in Arabidopsis thaliana,10.1073/pnas.0909571107,Proceedings of The

Nitrate-responsive miR393/AFB3 regulatory module controls root system architecture in Arabidopsis thaliana   (Citations: 9)
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Journal: Proceedings of The National Academy of Sciences - PNAS , vol. 107, no. 9, pp. 4477-4482, 2010
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    • ...Nitrate is one of the major forms of inorganic nitrogen in the biosphere and its availability is the limiting factor for plant growth and agricultural productivity for many crops ...

    Zhenhua Xuet al. Genome-Wide Identification of MicroRNAs in Response to Low Nitrate Ava...

    • ...Using a high-throughput 454 sequencing approach for small RNAs, Vidal et al. (2010) have recently described miR393 as induced in roots 2 h after nitrate addition to A. thaliana wild-type seedlings that were grown on ammonium as the sole N source...
    • ...The target gene of miR393, AFB3, encodes an auxin F-box receptor (AFB) and was ~4-fold induced already 1 h after nitrate addition to A. thaliana seedlings, but AFB3 transcript decreased rapidly (2 or 4 h) thereafter, suggesting active transcript degradation by miR393 (Vidal et al. 2010)...
    • ...Consistent with this, (1) miR393 overexpressing lines had diminished AFB3 levels, (2) lines expressing a miR393-resistant AFB3 transcript under control of the AFB3 promoter no longer showed a decrease of AFB3 transcript in the hours following nitrate induction, and (3) NR null mutants displayed high and stable AFB3 induction in the hours after nitrate addition (Vidal et al. 2010)...
    • ...Nitrate inhibition of primary root growth was also observed in the auxin-receptor mutants tir1, afb1, or afb2, but not in afb3 mutant or miR393 overexpressing plants, indicating the specific involvement of the auxin-receptor AFB3 in this signal pathway (Vidal et al. 2010)...

    Wolf-Rüdiger Scheibleet al. Nutrient-Responsive Plant microRNAs

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