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Developmental and physiological responses of Brachypodium distachyon to fluctuating nitrogen availability.


ABSTRACT: The Nitrogen Use Efficiency (NUE) of grain cereals depends on nitrate (NO3-) uptake from the soil, translocation to the aerial parts, nitrogen (N) assimilation and remobilization to the grains. Brachypodium distachyon has been proposed as a model species to identify the molecular players and mechanisms that affects these processes, for the improvement of temperate C3 cereals. We report on the developmental, physiological and grain-characteristic responses of the Bd21-3 accession of Brachypodium to variations in NO3- availability. As previously described in wheat and barley, we show that vegetative growth, shoot/root ratio, tiller formation, spike development, tissue NO3- and N contents, grain number per plant, grain yield and grain N content are sensitive to pre- and/or post-anthesis NO3- supply. We subsequently described constitutive and NO3--inducible components of both High and Low Affinity Transport Systems (HATS and LATS) for root NO3- uptake, and BdNRT2/3 candidate genes potentially involved in the HATS. Taken together, our data validate Brachypodium Bd21-3 as a model to decipher cereal N nutrition. Apparent specificities such as high grain N content, strong post-anthesis NO3- uptake and efficient constitutive HATS, further identify Brachypodium as a direct source of knowledge for crop improvement.

SUBMITTER: David LC 

PROVIDER: S-EPMC6405861 | biostudies-other | 2019 Mar

REPOSITORIES: biostudies-other

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Developmental and physiological responses of Brachypodium distachyon to fluctuating nitrogen availability.

David L C LC   Girin T T   Fleurisson E E   Phommabouth E E   Mahfoudhi A A   Citerne S S   Berquin P P   Daniel-Vedele F F   Krapp A A   Ferrario-Méry S S  

Scientific reports 20190307 1


The Nitrogen Use Efficiency (NUE) of grain cereals depends on nitrate (NO<sub>3</sub><sup>-</sup>) uptake from the soil, translocation to the aerial parts, nitrogen (N) assimilation and remobilization to the grains. Brachypodium distachyon has been proposed as a model species to identify the molecular players and mechanisms that affects these processes, for the improvement of temperate C3 cereals. We report on the developmental, physiological and grain-characteristic responses of the Bd21-3 acce  ...[more]

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