Depletion of carbohydrate reserves limits nitrate uptake during early regrowth in Lolium perenne L.

ABSTRACT: The mechanisms linking C/N balance to N uptake and assimilation are central to plant responses to changing soil nutrient levels. Defoliation and subsequent regrowth of grasses both impact C partitioning, thereby creating a significant point of interaction with soil N availability. Using defoliation as an experimental treatment, we investigated the dynamic relationships between plant carbohydrate status and NO3--responsive uptake systems, transporter gene expression, and nitrate assimilation in Lolium perenne L. High- and low-affinity NO3- uptake was reduced in an N-dependent manner in response to a rapid and large shift in carbohydrate remobilization triggered by defoliation. This reduction in NO3- uptake was rescued by an exogenous glucose supplement, confirming the carbohydrate dependenc

SUBMITTER: Guo Q 

PROVIDER: S-EPMC5444434 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature