Skip to Main content Skip to Navigation
Journal articles

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

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.
Document type :
Journal articles
Complete list of metadata

https://hal.inrae.fr/hal-02619371
Contributor : Chantal Baracco <>
Submitted on : Monday, May 25, 2020 - 4:51:08 PM
Last modification on : Tuesday, March 9, 2021 - 3:07:03 AM

File

MaghiaouiA.-et al-PostPrint-JE...
Files produced by the author(s)

Identifiers

Citation

Amel Maghiaoui, Eléonore Bouguyon, Candela Cuesta, Francine Perrine-Walker, Carine Alcon, 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 (OUP), 2020, 71 (15), pp.4480-4494. ⟨10.1093/jxb/eraa242/5840670⟩. ⟨hal-02619371⟩

Share

Metrics

Record views

99

Files downloads

86