Azospirillum brasilense Sp 245 increase growth and alleviate water stress in Arabidopsis thaliana by abscisic acid production

COHEN, A.; MORENO, D.; DOMINGUEZ, J.E.; LOPRESTI, N.; BOTTINI, R.; PICCOLI, P.

Huerta Grande, Córdoba, Argentina

Jornada; XVII Jornadas Científicas de la Sociedad de Biología de Córdoba; 2009

Sociedad de biología de Córdoba (SBC)

Azospirilllum brasilense is a plant growth promoter bacteria (PGPB) that increase grain yield in cereals and plant growth in different species. It presence may also alleviate plant water stress. Among the mechanisms proposed to explain these beneficial effects is the production of phytohormones by the bacteria, including indole-3-acetic acid (IAA), gibberellins (GAs) and abscisic acid (ABA). The aim of this work was to evaluate different mechanisms involved in A. thaliana plants inoculated or not with A. brasilense in both drought stress and well watered conditions. A. thaliana was cultivated in plastic pots with sand:vermiculite (1:1) at 24 °C with 16 h ligth and 8 h dark. The well watered plants inoculated with A. brasilense anticipated the phenological stages respect non inoculated plants, with a significant increase in rosette growth and rod length. Interestingly, A. brasilense inoculation enhanced percentage of survival in well watered plant as well as drought stress and ABA content in leaves measured by GC-MS. The results obtained suggested that A. brasilense promote growth and alleviate of water stress in A. thaliana plant by ABA production.