INVESTIGADORES
GRAS Diana Ester
congresos y reuniones científicas
Título:
Interaction between Arabidopsis thaliana and Sinorhizobium meliloti for improved plant growth and nitrogen nutrition
Autor/es:
KRAISER T; GRAS DE; ZUÑIGA A; O ́BRIEN J; MEDINA M; GONZÁLEZ B; GUTIÉRREZ RA
Reunión:
Congreso; XI Reunion biologia Vegetal Chile; 2016
Resumen:
Nitrogen (N) is an essentialmacronutrient and a major factor limiting plant growth in natural as well as inagricultural environments. Plants acquire N directly from the soiland in a few cases N can be provided by N-fixing bacteria. Plant:bacteria interactions associatedwith N-nutrition are well described in legumes, but are also observed in somenon-legume plant species. We found Arabidopsis thaliana growth under N-limitingconditions is enhanced by Sinorhizobium meliloti RMP110. This growth enhancement is in part mediated by bacterial N-fixation. Dilution of 15N labeling when Arabidopsis plants were grownwith S. meliloti indicated Arabidopsisplants indirectly acquired atmospheric N, where 14 N isotope predominates. Arabidopsishomologs of key regulatory genes involved in legume:rhizobium interactions are required for Arabidopsis growth promotion mediated by S. meliloti. Our results suggest conserved molecular mechanismsexist in plants to interact with N-fixing bacteria for improved growth under N-limitingconditions.