Increase in photoprotective and photosynthetic pigments in Arabidopsis thaliana seedlings induced by Azospirillum brasilense Sp 245

COHEN A C; MORENO D; BOTTINI R; PICCOLI P N

Mendoza

Jornada; XXVI Reunión Científica Anual de la Sociedad de Biología de Cuyo; 2008

Sociedad de Biología de Cuyo

Azospirilllum brasilense are plant growth promoter bacteria (PGPB) that increase grain yield in cereals and general plant growth in different species. In this work the content of photoprotective and photosynthetic pigments in A. thaliana plants inoculated or not with A. brasilense were analized. Seven days-old A. thaliana plants inoculated with 10 uL 106 CFU.mL-1 of A. brasilense or water (control) were cultivated in modified MS medium under a photoperiod of 16 h of light and 8 h of darkness. After 30 days,  the levels of chlorophyll a, b and carotenes and other parameters as leaf area (LA), root length (RL), root and shoot fresh weight (RFW, SFW) of inoculated plants and controls were assessed. The pigments levels were enhanced in inoculated plants along with augmented values of LA, RL, RFW and SFW. This result suggest that among the mechanism by which Azospirillum improve plant growth by increasing photoprotective and photosynthetic pigments.