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To generate knockout mutants, Agrobacterium-mediated transformation of the rice cultivar Nipponbare is performed according
Generation gene knockout mutants and screening
to Hiei et al. [57]. Usually, 40–50 transgenic lines per TALEN pair are regenerated in order to obtain targeted mutants. Genomic
DNA from individual hygromycin-resistant plants is extracted using a DNA Quick Plant System (Tiangen). The same PCR/RE digestion assay used in the protoplasts is applied to screen for transgenic lines (Fig. 4A). Candidate mutants are further confirmed by DNA sequencing (Fig. 4B). If the TALEN activity is efficient enough, mono allelic mutations are observed in most cases, but in some cases bi-allelic mutations can also be obtained in T0 plants, particularly when the TALEN activities are high.
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