Xue Rengao Xie Hongfeng.Rapid And Efficient Selection For TransgenicSoybean Plants With The ImprovedGlufosinate Selection System*[J].Soybean Science,2006,25(04):373-378.[doi:10.11861/j.issn.1000-9841.2006.04.0373]
利用改良的草丁膦筛选系统快速而有效筛选转基因大豆
- Title:
- Rapid And Efficient Selection For TransgenicSoybean Plants With The ImprovedGlufosinate Selection System*
- Keywords:
- Agrobacterium tumef aciens ; Cotyledonary node; Glufosinate; Soybean; Transfor-mation
- 文献标志码:
- A
- 摘要:
- 为提高大豆(Glycine max (L.) Merrill)遗传转化效率建立了一种快速而有效的草丁膦筛选系统。将刺伤的子叶节外植体接种于含有 pCAMBIA3201 载体的 LBA4404 农杆菌溶液。目前利用草丁膦筛选转基因大豆的常规方法是在含有5 mg /L 草丁膦的芽诱导培养基和含有 3~ 5 mg /L 草丁膦的芽伸长培养基上进行筛选 。利用此常规筛选方法所获得的大多数植株是非转化体, 从而导致转化效率变低, 为 1. 6%;而且这种方法极大地延迟了芽的伸长过程, 使多数不定芽的伸长发生在农杆菌处理后的 21~ 41 周 。为此 ,对常规草丁膦筛选方法进行了改良 。首先将外植体放置在不含有除草剂的芽诱导培养基上培养 3 周, 然后转到含有 4 mg /L 草丁膦的芽伸长培养基上进行筛选 。此时,多数不定芽仅在 7~ 12 周内便可伸长 。当芽长到3~ 5 cm 时 ,从外植体上切下来转到含有 1 ~ 5 mg /L 草丁膦的根诱导培养上进行进一步的筛选。结果表明,在添加有 3 mg /L 草丁膦根培养基上,转化效率达到最大值为6. 7%。不定芽对根培养基中的除草剂反应迅速,仅在 10d 天内所有非转化体都变枯死亡 。利用这种改良的筛选系统, 大多数转基因植株仅在 8~ 16 周内便可获得 。Southern 杂交结果证实了外源基因稳定地整合在大豆基因组中 。GUS 检测和除草剂抗性分析结果表明 ,被整合的外源基因在大豆细胞中得到了稳定的表达。
- Abstract:
- A rapid and efficient glufosinate selection system for obtaining high frequency of trans-formants insoybean [ Glycine max (L. ) Merrill] was developed. The cotyledonary node cellswere wounded and inoculated with Agrobacterium tumefaciens strain LBA4404 harboring a bina-ry vector pCAMBIA3201 that contained a selectable bar gene and a gus reporter gene. The pres-ent standard selection based on glufosinate was performed at 5 mg /L glufosinate during shoot in-duction and at 3~ 5 mg /L glufosinate during shoot elongation. Many non-transformants were es-caped with this standard selection system which resulted in low transformation efficiency of1. 6%, and a delayed shoot elongation with majority of transformed shoots elongation occurredfrom 21 to 41 weeks after Agrobacterium inoculation , and thus an improved glufosinate selectionsystem was provided in this paper. After 3 weeks on shoot induction medium without glufosi-nate , the explants were transferred to shoot elongation medium containing 4 mg /L glufosinate forthe first selection. The elongation of majority of transformed shoots occurred only from 7 to 12weeks without glufosinate selection during shoot induction. The transgenic shoots were effective-ly screened by placing the excised shoots on the root induction medium (RIM containing 3 mg /Lglufosinate to facilitate direct uptake of the selective agent that resulted in the high transforma-tion efficiency of 6. 7%. Shoots on the RIM rapidly responded to the selective agent applied , allthe glufosinate-sensitive shoots were completely necrotic within 10 days after selection. The ma-jority of transgenic plantlets were obtained only 8 ~ 16 weeks under the improved selection sys-tem. Genomic Southern blot analysis confirmed stable integration of the transgenes in the genomeof soybean. Stable expression was confirmed by GUS expression and herbicide application.
参考文献/References:
1 Olhoft PM , Flagel LE, Donovan CM , et al. Efficient soybeantransformation using hyg romy cin B selection in the coty ledonary-node method[ J] . Planta , 2003, 216:723- 735.
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备注/Memo
基金项目:山东省教育厅基金(J05K04)和莱阳农学院基金(630308)