MI-P10 LIPID SIGNALLING IN RESPONSE TO HYDRIC DEFICIT IN Azospirullum-INOCULATED BARLEY SEEDLING

MERINGER V; DARDANELLI M.S; RACAGNI G; VILLASUSO L

Córdoba

Congreso; LII Annual Meeting of the Argentine Society for Biochemistry and Molecular Biology Research; 2016

Water is one of the main resources that limit world agricultural production. A variety of strategies has been used to improve the drought tolerance of crops. Plants modulate rapidly a series of physiological responses in order to economize water use, such as: stomata close, osmotic adjustment by accumulation of compatibles solutes and changes in foliage structure and root system characteristics. The associative rhizobacterium Azospirillum brasilensehas been extensively investigated. It is a well-known for its ability to promote root growth, as well as its capacity to mitigate salt, water and osmotic stress in different species of plants. The aim of this study was to investigate the response to drought and test the effect of Az39 to mitigate drought stress in tissues of barley. Hydric deficit treatment was imposed by reducing the amount of irrigation to 20 % of its field capacity. Several days after the hydric deficit, a significant decrease in biomass, water content and height was observed. Modification in chlorophyll content, proline and phospholipase D activity were also observed. To assess the capacity of Az39 to mitigate drought stress, different concentrations of Az39 on germination seedling barley were assayed. Changes in the physiological and biochemical parameters suggest that barley seedling inoculated withAz39 may be better prepared to prosper under drought stress.