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植物研究 ›› 2023, Vol. 43 ›› Issue (5): 667-678.doi: 10.7525/j.issn.1673-5102.2023.05.004

• 遗传与育种 • 上一篇    下一篇

白城小黑杨遗传转化体系建立及其应用

何旭, 高源, 张群野, 周晨光, 李伟, 李爽()   

  1. 东北林业大学林木遗传育种全国重点实验室,哈尔滨 150040
  • 收稿日期:2023-01-21 出版日期:2023-09-20 发布日期:2023-09-05
  • 通讯作者: 李爽 E-mail:shuangli@nefu.edu.cn
  • 作者简介:何旭(1998—),男,硕士研究生,主要从事林木遗传育种方面的研究
  • 基金资助:
    国家自然科学基金项目(32001331);中央高校基本科研业务费专项资金项目(2572020DR01);黑龙江省头雁行动(林木遗传育种创新研究团队)

Establishment and Application of Genetic Transformation System for Populus simonii×P. nigra ‘Baicheng’

Xu HE, Yuan GAO, Qunye ZHANG, Chenguang ZHOU, Wei LI, Shuang LI()   

  1. State Key Laboratory of Forest Tree Genetics and Breeding,Northeast Forestry University,Harbin 150040
  • Received:2023-01-21 Online:2023-09-20 Published:2023-09-05
  • Contact: Shuang LI E-mail:shuangli@nefu.edu.cn
  • About author:HE Xu(1998—),male,postgraduate,mainly engaged in forest genetics and breeding.
  • Supported by:
    National Natural Science Foundation of China(32001331);Fundamental Research Funds for the Central Universities of China(2572020DR01);Heilongjiang Touyan Innovation Team Program(Tree Genetics and Breeding Innovation Team)

摘要:

以白城小黑杨(Populus simonii×P. nigra ‘Baicheng’)组培苗茎段为外植体,MS为基本培养基,通过调节不同植物生长激素6-BA、NAA、TDZ和IBA浓度诱导其离体再生。基于组织培养系统,经过卡那霉素浓度筛选、侵染时间确定,最终建立适用于白城小黑杨的农杆菌(Agrobacterium tumefaciens)介导的遗传转化体系。利用该系统成功创制了杨树应拉木形成关键调控基因LBD39Lateral Organ Boundaries Domain)的过量表达转基因植株。结果表明:白城小黑杨组织培养体系包括不定芽分化诱导、抽茎诱导、生根诱导3个阶段,不定芽分化诱导最适培养基为MS+0.5 mg·L-1 6-BA+0.1 mg·L-1 NAA+0.001 mg·L-1 TDZ,分化率92.6%;抽茎诱导最适培养基为MS+0.2 mg·L-1 6-BA+0.05 mg·L-1 NAA,抽茎增值系数6.5;生根诱导最适培养基为1/2 MS+0.4 mg·L-1 IBA,生根率100%。遗传转化最适卡那霉素质量浓度为30 mg·L-1、最佳侵染时间为20 min,经30 d不定芽诱导、15~30 d抽茎诱导、25 d生根诱导即可成功获得转基因植株,GUS基因的转化效率为2%。应用此遗传转化体系,对杨树应拉木关键调控基因LBD39进行了过表达植株创制,最终获得5株过表达植株,转化效率为3.3%。

关键词: 白城小黑杨, 组织培养, 遗传转化, LBD39

Abstract:

Stems of Populus simonii×P. nigra ‘Baicheng’ in vitro plants were selected as explants and MS medium was used to establish tissue culture system by adjusting the hormone concentrations of 6-BA, NAA, TDZ and IBA. Based on the tissue culture system, the optimal concentration of kanamycin and infection time were confirmed to establish Agrobacterium tumefaciens-mediated genetic transformation system for P. simonii×P. nigra ‘Baicheng’. By using this system, the transgenic plants overexpressed a key tension wood formation regulator LBD39 (Lateral Organ Boundaries Domain) were created successfully. The results showed that the tissue culture system consisted of three stages, including adventitious bud differentiation induction (MS+ 0.5 mg·L-1 6-BA+0.1 mg·L-1 NAA+0.001 mg·L-1 TDZ, shoot differentiation rate=92.6%), stem induction (MS+0.2 mg·L-1 6-BA+0.05 mg·L-1 NAA, multiplication coefficient=6.5) and rooting induction (1/2 MS+0.4 mg·L-1 IBA, rooting percentage=100%). The optimal kanamycin concentration for genetic transformation was 30 mg·L-1 and the optimal infection time was 20 min, and the transgenic plants were obtained successfully after 30 d of adventitious bud differentiation induction, 15-30 d of stem induction and 25 d of rooting induction with 2% transformation efficiency respectively. By using this system, five overexpressed plants of LBD39 were obtained, and the transformation efficiency was 3.3%.

Key words: Populus simonii×P. nigra ‘Baicheng’, tissue culture, genetic transformation, LBD39

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