Agrobacterium tumefaciens strain LBA4404 harboring the plasmid pCAMBIA1301 which contains stress tolerance-related transcription factor ZjDREB1 gene and reporter gene HPT was used to transform axillary bud-derived embryogenic calluses of Eremochloa ophiuroides ‘E126’. To systematically optimize the conditions of centipedegrass transformation, several factors which could influence Agrobacterium-mediated DNA transfer were examined, including concentration of selective agent and bacteriostat, bacterial concentration, duration of infection and co-cultivation. Consequently, a transformation system of transgenic centipedegrass plants was established. It was found that the efficiency of transformation highly relied on the following optimal conditions: The concentration of hygromycin for selection was 30 mg/L; the cefotaxime concentration for restraining the Agrobacterium was 400 mg/L; OD600 as 0.3, 30 min of infection time and 3 days. Co-cultivation time was the optimized condition for genetic transformation system in E. ophiuroides. Ten transgenic plants were identified by PCR detection from initial 44 regenerated plants.%以假俭草优良种质‘E126'为受体材料,以HPT基因为报告基因,通过农杆菌介导法转入ZjDREBl基因.研究了转化体系中筛选剂和抑菌素对胚性愈伤组织生长和绿苗分化的影响,以及菌液浓度、侵染时间和共培养时间对转化效率的影响.结果表明,愈伤筛选和再生苗筛选的最佳潮霉素浓度均为30 mg/L,头孢霉素作为抑菌素的最佳浓度为400 mg/L;菌液OD600值为0.3,侵染30 min,共培养3 d为最优转化条件.经PCR检测,初步获得10株转基因植株.
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