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The inoculation with Pseudomonas fluorescens, confers tolerance to water and salt stress in Arabidopsis thaliana plants
ANA C. COHEN; CARLA SALVADORES; RUBÉN BOTTINI; PATRICIA N. PICCOLI
Jornada; XXX Reunión Anual de la Sociedad de Biología de Cuyo; 2012
Sociedad de Biología de Cuyo
Pseudomonas sp. are a well-studied group of bacteria that promotes plant growth (PGPR). This group has been studied for increasing agricultural production and as biocontrol agents against plant diseases. In a previous study P. fluorescens was isolated from roots of Vitis vinifera L. (cv. Malbec) and it was determined that P. fluorescens produces the plant hormone abscisic acid (ABA) in chemical-defined media. The aim of this study was to evaluate the effect of inoculation of P. fluorescens in A. thaliana plants, well-watered (W), submitted to drought conditions (D) or salt stress (S). Experiments were carried out in chamber growth with 12 h light at 22 °C on pot. Seven days-old A. thaliana seedlings were inoculated with P. fluorescens in PBS or PBS (control). At 30 days, the different treatments (W, D, S) were applied. After 25 days, morphological-physiological modifications produced in inoculated plants were measured. P. fluorescens stimulated leaf area and the fresh and dry weight of aerial part in all treatments. Also, inoculation improved seed yield and decreased stomatal conductance in plants submitted to drought and salt stress. The D+I and S+I plants reached wilting point later than D and S, so alleviating stress. This opens new alternatives for a strategy against drought and salt stress.