Agrobacterium tumefaciens-mediated transformation: An efficient tool for insertional mutagenesis and targeted gene disruption in Harpophora oryzae

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• 作者：Ning Liu^a ; Guo-Qing Chen^b ; Guo-Ao Ning^a ; Huan-Bin Shi^a ; Chu-Long Zhang^a ; Jian-Ping Lu^c ; Li-Juan Mao^e ; Xiao-Xiao Feng^a ; Xiao-Hong Liu^a ; Zhen-Zhu Su^a ; ^{zhenzhusu@126.com" class="auth_mail" title="E-mail the corresponding author} ; Fu-Cheng Lin^a ; ^d ; ^{fuchenglin@zju.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Endophytic fungus ; Harpophora oryzae ; Agrobacterium tumefaciens-mediated transformation ; Insertional mutagenesis ; Gene deletion mutagenesis ; Sulfonylurea resistance
• 刊名：Microbiological Research
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：182
• 期：Complete
• 页码：40-48
• 全文大小：2160 K

文摘

The endophytic filamentous fungus Harpophora oryzae is a beneficial endosymbiont isolated from the wild rice. H. oryzae could not only effectively improve growth rate and biomass yield of rice crops, but also induce systemic resistance against the rice blast fungus, Magnaporthe oryzae. In this study, Agrobacterium tumefaciens-mediated transformation (ATMT) was employed and optimized to modify the H. oryzae genes by either random DNA fragment integration or targeted gene replacement. Our results showed that co-cultivation of H. oryzae conidia with A. tumefaciens in the presence of acetosyringone for 48 h at 22 °C could lead to a relatively highest frequency of transformation, and 200 μM acetosyringone (AS) pre-cultivation of A. tumefaciens is also suggested. ATMT-mediated knockout mutagenesis was accomplished with the gene-deletion cassettes using a yeast homologous recombination method with a yeast–Escherichia–Agrobacterium shuttle vector pKOHo. Using the ATMT-mediated knockout mutagenesis, we successfully deleted three genes of H. oryzae (HoATG5, HoATG7, and HoATG8), and then got the null mutants ΔHoatg5, ΔHoatg7, and ΔHoatg8. These results suggest that ATMT is an efficient tool for gene modification including randomly insertional mutagenesis and gene deletion mutagenesis in H. oryzae.