Putative role of γ ‐aminobutyric acid (GABA) as a long‐distance signal in up‐regulation of nitrate uptake in Brassica napus L.

摘要: The relationship between nitrate influx, BnNrt2 transporter gene expression and amino acid composition of phloem exudate was investigated during N-deprivation (short-term experiment) over a growth cycle (long-term in Brassica napus L. data showed positive correlation γ-aminobutyric (GABA) uptake the short- long-term experiments. hypothesis that this non-protein could up-regulate via long-distance signalling pathway tested by providing an exogenous GABA supply to roots. effect compared with effects Gln, Glu Asn, each known be inhibitors uptake. results treatment induced significant increase mRNA expression, but had less on influx. By contrast, Asn significantly reduced influx control plants. This study provides first evidence may act as putative inter-organ signal molecule plants conjunction negative exerted Gln. up-regulation is discussed context its role N metabolism, nutritional stress recent discovery plant development.