Transporters Involved in Nitrogen Uptake and Movement

Abstract

Families of nitrogen (N) transporters have been identifi ed in the model plantArabidopsis , and this template is useful for other species. For crops, uptake effi ciency is an important component of nitrogen use efficiency (NUE), which has been shown to vary widely between cultivars and species. The root is the most important organ for acquiring soil nitrogen, which is chiefl y available as NO 3 − , NH 4 + or amino acids. Soil nitrogen form and availability to roots is transient, and the concentrations can rapidly change in response to climatic factors. Although root architecture is undoubtedly a key trait for nitrogen acquisition effi ciency (see Chapter 2 ) and the rhizosphere infl uences availability (Chapter 3 ), the activity of root transporters is important for uptake. Roots have transporter systems to acquire the different nitrogen forms from the soil. Ammonium uptake is achieved by ammonium transporters (AMTs) and amino acids by several different families of transporters. Within the root, NO 3 − uptake and transport are realized by NO 3 − transporters (NRTs),

Zinc finger transcription factorsBnaSTOP2sregulate sulfur metabolism and confer resistance toSclerotinia sclerotioruminBrassica napus

“…Therefore, we conducted a comprehensive transcriptome analysis focusing on both WT (13CK) plants and Bnastop2 mutants across roots and siliques at 20 DAF. These tissues serve as pivotal sources and sinks for sulfur metabolism, respectively (Hawkesford, 2012; Miller and Chapman, 2011). In our investigation of roots, we identified 3067 differentially up-regulated genes and 3378 differentially down-regulated genes (|log 2 foldchange | ≥2 and pval ≤0.05) (Supplemental Figure 10A).…”