The invention provides a method for protecting and restoring
germplasm of citrus-Hunglongbing-infected citrus according to a two-
step method. The method comprises the steps of soaking seeds into
alcohol with concentration of 70% for one minute, soaking the seeds into NaOH with concentration of 5% for eliminating
pectin, then soaking the seeds into
sodium hypochlorite solution with concentration of 3% for 20 minutes, cleaning with
sterile water by 2-3 times, then immersing the seeds in normal-temperature water for 5-10 hours, then performing
thermal treatment on the seeds by means of wet-and-hot air with temperature of 50-55 DEG C for 40-60 minutes, then removing seed shells,
sowing the seeds into an MS medium in which
enrofloxacin sodium and sulfadimethoxine
sodium antibiotic are added,
transplanting seedlings into disinfected
nutrient soil after the seedlings are grown to a height of 5cm, and
grafting the newly grown
branch from a nursery stock as a scion on a stock
seedling which is grown from a stock
seedling which is processed in the same way. According to the method of the invention, the antibiotic composition which comprises the
enrofloxacin sodium and the sulfadimethoxine sodium antibiotic is utilized for reasonable mixing; and a two-
step method which comprises
thermal treatment and adding the antibiotic is firstly utilized for performing sterilization on the citrus-Hunglongbing-infected citrus, thereby realizing higher sterilization effect.