The outcome of plant-bacterium interactions is often emphasized by bacterial protein secretion systems. T3SS is commonly used by symbiotic and/or pathogenic bacteria to secrete effecter proteins into host cells and, thus, trigger host cell responses (7). The draft genome data displayed a lower G+C content in the T3SS region (58.3%) than that of the chromosome (63.89%). SUTN9-2 may have acquired T3SS through horizontal gene transfer, which often occurs in rhizobia (28). Our results demonstrated that the T3SS gene (rhcJ) was strongly expressed when only roots exudates were applied. In addition, the genetic organization and amino acid sequences of T3SS genes were conserved better in both of the rice endophytic strains (SUTN9-2 and DOA9) than in the non-rice endophytic strain 美國農業部110(圖6)每日問候和對話
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