The invention discloses a tissue-culture-free
agrobacterium rhizogenes-mediated genetic transformation
system method for crape myrtle hairy roots, and relates to the technical field of
molecular biology.The method comprises the steps that an overexpression vector carrying an RUBY visual tag is constructed,
agrobacterium rhizogenes K599 is introduced, and a positive
engineering strain is obtained through resistance screening and molecular
verification; propagating the positive
engineering strain, centrifugally collecting thalli, resuspending by using a
buffer solution containing
acetosyringone, adjusting the concentration of a bacterial solution, and standing and activating to form a bacterial suspension for infection; the method comprises the following steps: selecting current-year semi-lignified branches of crape myrtle to prepare
cutting slips, retaining two pairs of
bud points, and performing incision treatment; the
cutting slips are completely immersed in the bacterial suspension for infection, and
agrobacterium tumefaciens-mediated genetic transformation is completed in combination with vacuum-assisted treatment; taking out the
cutting slips, temporarily dipping the cutting slips in a rooting
aqueous solution, and then cutting the cutting slips in a sterile substrate formed by mixing
vermiculite and
perlite; and culturing for 24 hours under a dark condition, and continuously culturing for 30 days in a high-temperature and high-
humidity environment.