Agrobacterium-mediated transformation of rice
Japonica rice varieties Nipponbare and
Taichung 65 were used for transformation of
pPI01_B2S. Mature rice seeds were used for
callus induction for 4 weeks (Toki, 1997). The
scutellum-derived embryogenic calli from mature
rice seeds were subcultured using fresh induction
medium for 3–5 days. The subcultured calli were
infected with A. tumefaciens strain AGL1 harboring
pPI01_B2S and then co-cultivated for 3 days.
After 3-day co-cultivation, the calli were washed to
remove excess bacteria and then cultured on
selection medium supplemented with 15 mg/l
hygromycin and 150 mg/l timentin for 2 weeks.
Following the 1st selection, the calli were
transferred to the 2nd selection medium
supplemented with 30 mg/l hygromycin and 150
mg/l timentin and cultured for 2 weeks.
After 2 cycles of selection, the surviving calli
were transferred to regeneration medium
supplemented with 30 mg/l hygromycin and 150 mg/l
timentin and cultured at 28 2 oC with a 16 h
photoperiod and later subcultured every two weeks
until the calli were regenerated to plantlets. Then,
the plantlets were transferred to half-strength MS
medium for root formation (Sakulsingharoj et al.,
2014).