Glutamine, arginine and the amino acid transporter Pt-CAT11 play important roles during senescence in poplar

摘要: Background and aims Nitrogen (N) availability in the forest soil is extremely low N economy has a special importance woody plants that are able to cope with seasonal periods of growth development over many years. Here we report on analysis amino acid pools expression key genes perennial species Populus trichocarpa during autumn senescence. Methods Amino were measured throughout Expression arginine synthesis cationic transporter (CAT) senescence was performed. Heterologous yeast mutants performed study Pt-CAT11 function detail. Key results Analysis showed an increase glutamine leaves accumulation stems biosynthesis suggests preferentially synthesized from tissues. increased senescing functional characterization demonstrated transports glutamine. Conclusions The present established relationship between senescence, being accumulated as storage compound tissues such stems. In this context, may have role remobilization poplar, by facilitating loading into phloem vessels.