Abstract
Crop plants can be severely affected by various types of abiotic stress, including stress resulting from salinity and water deficit (drought). Certain bacteria associated with plants can stimulate tolerance to these types of stress through various beneficial mechanisms such as the production of the enzyme 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase and the compound trehalose. ACC deaminase acts by lowering ethylene levels in stressed plants, and trehalose, a nonglucose reducing disaccharide, acts by stabilizing biological structures. Recent studies suggest that these mechanisms can act synergistically to ameliorate the damaging effects of salinity and drought on plants of agricultural interest. Therefore, this chapter reviews the current information regarding the production of ACC deaminase and trehalose in beneficial bacteria associated with crop plants and also discusses their potential applications in the field.
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