农杆菌介导的花魔芋遗传转化体系的优化
2015-10-21陈磊郭政宏等
陈 磊 郭政宏等



摘要
[目的] 探讨魔芋愈伤组织培養基、不同转化条件(菌液浓度、侵染时间、预培养时间及共培养时间)及转化植株的筛选条件(抗生素浓度和乙酰丁香酮(AS)浓度)等因素对转化效率的影响。[方法]采用卡那霉素抗性基因为选择标记,对农杆菌介导的花魔芋遗传转化体系进行优化。[结果]在预培养2 d,用OD600为0.6的菌液侵染30 min、共培养3 d,卡那霉素100 mg/L,羧苄青霉素250 mg/L,AS浓度100 μmol/L的条件下能有效提高转化效率。再生花魔芋植株经GUS染色及PCR检测,结果表明外源目的基因已经整合到花魔芋基因组中。[结论] 为魔芋抗病品种的转基因培育,丰富其种质资源,寻找抗病新途径提供理论依据和试验基础。
关键词 花魔芋;农杆菌;遗传转化体系
中图分类号 S188 文献标识码 A 文章编号 0517-6611(2015)05-021-04
Optimized Genetic Transformation System of Amorphophallus konjac Mediated by Agrobacterium tumfaciens
CHEN Lei, GUO Zhenghong, CHENG Haili, YUE Chaoyin*
(Biotechnology Research Center, Three Gorges University, Yichang, Hubei 443002)
Abstract [Objective] Factors that influence Agrobacterium tumfaciensmediated transformation of Amorphophallus konjac, including culture medium, transformation conditions and selection reagents were investigated. [Method]An transformation system mediated by Agrobacterium tumfaciens has been optimized to obtain transgenic plants of Amorphophallus konjac by using kanamycin resistance gene as marker gene. [Result]The results showed that preculture for 2 days before infection by Agrobacterium (OD600= 0.6, 30 min) and then coculture for 3 days yielded the highest rate of antibiotic resistant callus formation with the addition of kanamycin (100 mg/L), carbenicillin (250 mg/L) and acetosyringone(100 μmol/L). The transgenic plants were screened and reclarified by GUS staining and PCR analysis that the exogenous gene was integrated into Amorphophallus konjac genome.[Conclusion] The study provided theoretical basis and experimental basis for cultivating genetically resistant varieties, riching germplasm resources and finding new ways for disease resistance.
Key words Amorphophallus konjac;Agrobacterium tumfaciens;Genetic transformation system
基金项目 国家自然科学基金项目(30871579)。
作者简介
陈磊(1990-),男,湖北孝感人,硕士研究生,研究方向:微生物与植物互作。*通讯作者,教授,博士,从事微生物与植物互作研究。
收稿日期 20141222
魔芋(Amorphophallus)属天南星科(Areaceae)魔芋属多年生草本植物,其变态茎宿存于地下,通常呈球形、扁球形或柱状球形[1],主要栽培种为花魔芋Amorphophallus konjac)和白魔芋(Amorphophallus albus)。魔芋块茎内富含葡甘聚糖(Konjac glucomannan)、各种人体必需氨基酸和微量元素[2]。葡甘聚糖可广泛用于食品、医药、保健、农业、化工、纺织、石油钻探等领域,具有极大的商业价值。
随着魔芋种植面积的不断扩大,魔芋软腐病的发生也逐年加剧,发生严重时产量损失达30%~50%,严重的达80%以上,甚至绝收[3],严重影响农民种植魔芋积极性。……
