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Bulletin of Botanical Research ›› 2023, Vol. 43 ›› Issue (6): 835-845.doi: 10.7525/j.issn.1673-5102.2023.06.006

• Genetic and Breeding • Previous Articles     Next Articles

Effects of Different Vectors and Agrobacteriumtumefaciens on Transient Expression of Alfalfa

Min SUN1, Honghong YANG1, Anqi WANG1, Yuejing ZHANG1, Xiaowei DA1, Ji ZHANG1,2, Kun SUN1, Jianping WU1,2, Hanqing FENG1,2()   

  1. 1.College of Life Science,Northwest Normal University,Lanzhou 730070
    2.New Rural Development Research Institute of Northwest Normal University,Lanzhou 730070
  • Received:2022-10-14 Online:2023-11-20 Published:2023-11-08
  • Contact: Hanqing FENG E-mail:fenghanq@nwnu.edu.cn
  • About author:SUN Min(1996—),female,master,majoring in the cultivation of Chinese herbal medicine research.
  • Supported by:
    Higher Education Industry Support Plan Project of Gansu Province(2023CYZC-20);Key Research and Development Project of Gansu Province(22YF7NA119);Major Project of Science and Technology Plan of Gansu Province(22ZD1NA001);Key Talent Project of Gansu Province(20220401);Special Fund for Guiding Scientific and Technological Innovation Development of Gansu Province(2019ZX-05);Open Fund of New Rural Development Institute of Northwest Normal University;Graduate Research Funding Project of Northwest Normal University(2021KYZZ01037);Funding Project for Excellent Doctoral Thesis Training of Northwest Normal University;Science and Technology Program of Gansu Province(Excellent Doctoral Project)(23JRRA697)

Abstract:

Alfalfa(Medicago sativa) is an important forage plants. In order to effectively express foreign genes in alfalfa, by using the green fluorescent protein(GFP) as report gene and Nicotiana benthamiana as a comparison, the effects of two different vectors(the non-replicating and the BeYDV(bean yellow dwarf virus)-based replicating vectors), and two different Agrobacterium tumefaciens strains(LBA4404 and EHA105) on the transient expression of alfalfa leaves were investigated. The results showed that the combination of LBA4404 with the replicating vector(re-vector/LBA4404) led to effective expression of GFP in alfalfa leaves. By using LBA4404 with the replicating vector, the effects of the concentration ofre-vector/LBA4404 and incubation time after infection on the transient expression were also evaluated. It was found that with the increase of concentration of bacterial suspension or time post-infection, the expression level of GFP increased first but then decreased. In the leaves of alfalfa, the highest expression level of GFP was observed when the concentration of LBA4404 strain was 1.0(OD600); and the expression level of GFP reached the peak at 5-7 d after infection. Compared with Nicotiana benthamiana, achieving the highest expression level of GFP in alfalfa might need higher concentration of Agrobacterium tumefaciens and longer incubation time after infection.

Key words: Agrobacterium tumefaciens, transient expression, alfalfa

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