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RAD51 (DNA repair gene) family genes play ubiquitous roles in immune response among species from plants to mammals. In this study, we cloned the ZmRAD51A gene (a member of RAD51 ) in maize and generated ZmRAD51A overexpression ( ZmRAD51A -OE) in rice, tobacco, and Arabidopsis . The expression level of ZmRAD51A was remarkably induced by salicylic acid (SA) application in maize, and the transient overexpression of ZmRAD51A in tobacco induced a hypersensitive response. The disease resistance was significantly enhanced in ZmRAD51A - OE (overexpressing) plants, triggering an increased expression of defense-related genes. High-performance liquid chromatography (HPLC) analysis showed that, compared to control lines, ZmRAD51A -OE in rice plants resulted in higher SA levels, and conferred rice plants resistance to Magnaporthe oryzae . Moreover, the ZmRAD51A -OE Arabidopsis plants displayed increased resistance to Pseudomonas syringae pv. tomato DC3000 when compared to wild types. Together, our results provide the evidence that, for the first time, the maize DNA repair gene ZmRAD51A plays an important role in in disease resistance.

DNA Repair Gene ZmRAD51A Improves Rice and Arabidopsis Resistance to Disease