The Arabidopsis NRT1.1 transceptor coordinately controls auxin biosynthesis and transport to regulate root branching in response to nitrate

A. Maghiaoui, E. Bouguyon, C. Cuesta, F. Perrine-Walker, C. Alcon, G. Krouk, E. Benková, P. Nacry, A. Gojon, L. Bach, Journal of Experimental Botany (n.d.) eraa242.


Journal Article | Accepted | English
Author
Maghiaoui, A; Bouguyon, E; Cuesta, CandelaIST Austria; Perrine-Walker, F; Alcon, C; Krouk, G; Benková, EvaIST Austria ; Nacry, P; Gojon, A; Bach, L
Department
Abstract
In agricultural systems, nitrate is the main source of nitrogen available for plants. Besides its role as a nutrient, nitrate has been shown to act as a signal molecule for plant growth, development and stress responses. In Arabidopsis, the NRT1.1 nitrate transceptor represses lateral root (LR) development at low nitrate availability by promoting auxin basipetal transport out of the LR primordia (LRPs). In addition, our present study shows that NRT1.1 acts as a negative regulator of the TAR2 auxin biosynthetic gene expression in the root stele. This is expected to repress local auxin biosynthesis and thus to reduce acropetal auxin supply to the LRPs. Moreover, NRT1.1 also negatively affects expression of the LAX3 auxin influx carrier, thus preventing cell wall remodeling required for overlying tissues separation during LRP emergence. Both NRT1.1-mediated repression of TAR2 and LAX3 are suppressed at high nitrate availability, resulting in the nitrate induction of TAR2 and LAX3 expression that is required for optimal stimulation of LR development by nitrate. Altogether, our results indicate that the NRT1.1 transceptor coordinately controls several crucial auxin-associated processes required for LRP development, and as a consequence that NRT1.1 plays a much more integrated role than previously anticipated in regulating the nitrate response of root system architecture.
Publishing Year
Date Published
2020-05-19
Journal Title
Journal of Experimental Botany
Article Number
eraa242
IST-REx-ID

Cite this

Maghiaoui A, Bouguyon E, Cuesta C, et al. The Arabidopsis NRT1.1 transceptor coordinately controls auxin biosynthesis and transport to regulate root branching in response to nitrate. Journal of Experimental Botany.:eraa242. doi:10.1093/jxb/eraa242
Maghiaoui, A., Bouguyon, E., Cuesta, C., Perrine-Walker, F., Alcon, C., Krouk, G., … Bach, L. (n.d.). The Arabidopsis NRT1.1 transceptor coordinately controls auxin biosynthesis and transport to regulate root branching in response to nitrate. Journal of Experimental Botany, eraa242. https://doi.org/10.1093/jxb/eraa242
Maghiaoui, A, E Bouguyon, Candela Cuesta, F Perrine-Walker, C Alcon, G Krouk, Eva Benková, P Nacry, A Gojon, and L Bach. “The Arabidopsis NRT1.1 Transceptor Coordinately Controls Auxin Biosynthesis and Transport to Regulate Root Branching in Response to Nitrate.” Journal of Experimental Botany, n.d., eraa242. https://doi.org/10.1093/jxb/eraa242.
A. Maghiaoui et al., “The Arabidopsis NRT1.1 transceptor coordinately controls auxin biosynthesis and transport to regulate root branching in response to nitrate,” Journal of Experimental Botany, p. eraa242.
Maghiaoui A, Bouguyon E, Cuesta C, Perrine-Walker F, Alcon C, Krouk G, Benková E, Nacry P, Gojon A, Bach L. The Arabidopsis NRT1.1 transceptor coordinately controls auxin biosynthesis and transport to regulate root branching in response to nitrate. Journal of Experimental Botany., eraa242.
Maghiaoui, A., et al. “The Arabidopsis NRT1.1 Transceptor Coordinately Controls Auxin Biosynthesis and Transport to Regulate Root Branching in Response to Nitrate.” Journal of Experimental Botany, Oxford University Press, p. eraa242, doi:10.1093/jxb/eraa242.
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