Abscisic acid influences ammonium transport via regulation of kinase CIPK23 and ammonium transporters.

Ammonium uptake at plant roots is regulated at the transcriptional, posttranscriptional, and posttranslational levels. Phosphorylation by the protein kinase calcineurin B-like protein (CBL)-interacting protein kinase 23 (CIPK23) transiently inactivates ammonium transporters (AMT1s), but the phosphatases activating AMT1s remain unknown. Here, we identified the PP2C phosphatase abscisic acid (ABA) insensitive 1 (ABI1) as an activator of AMT1s in Arabidopsis (Arabidopsis thaliana).

Concentration-dependent physiological and transcriptional adaptations of wheat seedlings to ammonium.

Conventional wheat production utilizes fertilizers of various nitrogen forms. Sole ammonium nutrition has been shown to improve grain quality, despite the potential toxic effects of ammonium at elevated concentrations. We therefore investigated the responses of young seedlings of winter wheat to different nitrogen sources (NH NO = NN, NH Cl = NNH and KNO = NNO ).

A pore-occluding phenylalanine gate prevents ion slippage through plant ammonium transporters.

Throughout all kingdoms of life, highly conserved transport proteins mediate the passage of ammonium across membranes. These transporters share a high homology and a common pore structure. Whether NH, NH or NH + H is the molecularly transported substrate, still remains unclear for distinct proteins.

Expression analysis of two () genes during in vitro morphogenesis in Spanish cedar ( L.).

Somatic embryogenesis (SE) is one of the most important steps during regeneration, but the molecular mechanism of SE remains unclear for . SOMATIC EMBRYOGENESIS RECEPTOR-LIKE KINASE (SERK) is one of the genes associated with induction of SE and is considered a marker of cells competent to form somatic embryos. Our objective was to clone and characterize the and gene homologues and analyze their expression patterns during in vitro morphogenesis in Spanish cedar.