Abstract
The effects of temporary immersion system (TIS) culture on the growth and quality of Siraitia grosvenorii plantlets were investigated. The TIS promoted the growth and quality of S. grosvenorii plantlets. Proliferation rate, shoot length, fresh weight (FW) and dry weight (DW) of shoots, and total biomass production were significantly (P ≤ 0.05) higher in the TIS than in gelled and liquid medium, respectively. The TIS also decreased callus formation at the base of shoots. Callus diameter was significantly (P ≤ 0.05) lower in the TIS (3.30 mm) than in gelled medium (6.31 mm) and liquid medium (6.77 mm), respectively. FW (50.83 mg) and DW (7.08 mg) of callus in the TIS were also significantly (P ≤ 0.05) lower than those in gelled medium (80.00 and 10.56 mg, respectively) and liquid medium (218.75 and 23.75 mg, respectively). During rhizogenesis, minimal callus was evident at the base of shoots in the TIS, with a well-developed root system. However, the plantlets in gelled medium just produced thick, brown and easily broken roots with obvious callus and fewer secondary roots. The natural-like plantlets of S. grosvenorii obtained in the TIS would probably have positive effects on ex vitro rooting and transplanting in large-scale commercial production.
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