title: Transgenic ramie [Boehmeria nivea (L.) Gaud.]: factors affecting the efficiency of Agrobacterium tumefaciens-mediated transformation and regeneration.
abstract: In the present study, an efficient Agrobacterium-mediated gene transformation system was developed for ramie [Boehmeria nivea (L.) Gaud.] based on the examinations of several factors affecting plant transformation efficiency. The effects of Agrobacterium cell density, acetosyringone, co-cultivation temperature, co-cultivation duration, co-cultivation photoperiod and pH on stable transformation were evaluated. Agrobacterium at a concentration of OD = 0.5-0.8 improved the efficiency of transformation. Concentration of acetosyringone at 50 mg/L during co-cultivation significantly increased transformation efficiency. Co-cultivation at 20 degrees C, in comparison to 15, 25 and 28 degrees C, consistently resulted in higher transformation frequencies. A relatively short co-cultivation duration (3 days) was optimal for ramie transformation. Co-cultivation medium at pH 5.9 and co-cultivation in darkness both improved the transformation efficiencies of ramie. An overall scheme for producing transgenic ramie is presented, through which an average transformation rate from 10.5 to 24.7% in five ramie varieties was obtained. Stable expression and integration of the transgenes were confirmed by histochemical GUS assay, kanamycin painting assay, PCR and Southern blotting. This optimized transformation system should be employed for efficient Agrobacterium-mediated transformation of ramie.
authors.affiliation: College of Plant Science and Technology, Huazhong Agricultural University, 430070, Wuhan, Hubei, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Wang
authors.forename: Lijun
authors.initials: L
authors.lastname: Liu
authors.forename: Xuxia
authors.initials: X
authors.lastname: Wang
authors.forename: Jinyu
authors.initials: J
authors.lastname: Yang
authors.forename: Zhenxia
authors.initials: Z
authors.lastname: Sun
authors.forename: Na
authors.initials: N
authors.lastname: Zhang
authors.forename: Shimei
authors.initials: S
authors.lastname: Gao
authors.forename: Xiulong
authors.initials: X
authors.lastname: Xing
authors.forename: Dingxiang
authors.initials: D
authors.lastname: Peng
mesh_terms: D000098:Acetophenones / Q000737:chemistry; D016960:Agrobacterium tumefaciens / Q000235:genetics*; D032402:Boehmeria / Q000235:genetics* / Q000254:growth & development; D018920:Coculture Techniques; D003470:Culture Media; D004338:Drug Combinations; D005818:Genetic Engineering / Q000379:methods*; D009821:Oils; D010636:Phenols; D030821:Plants, Genetically Modified / Q000235:genetics / Q000254:growth & development; D012038:Regeneration; D013696:Temperature; D014170:Transformation, Genetic
chemical_list: D000098:Acetophenones; D003470:Culture Media; D004338:Drug Combinations; D009821:Oils; C027222:P & S Liquid; D010636:Phenols; C051667:acetosyringone