Yuwalak Phaidee. In vitro plant multiplication of Gynura procumbens and chemical analysis of regenerants . Master's Degree(Plant Science). Mahidol University. : Mahidol University, 2008.
In vitro plant multiplication of Gynura procumbens and chemical analysis of regenerants
Abstract:
Gynura procumbens Merr. is widely used for the treatment of inflammation
skin rash, rheumatism, and viral diseases of the skin in traditional medicine. There
for, to increase the supply, in vitro direct and indirect shoot multiplication techniques
were developed in this research. The effects of plant growth regulators (TDZ, BA,
NAA, and 2,4-D), duration of culture, and explant types were investigated for
multiple shoot induction via direct and indirect shoot organogenesis. Multiple shoots
were directly induced from node explants cultured on MS with 9.08 μM TDZ for 6
weeks prior to transfer to culture on MS medium without plant growth regulator for 8
weeks. The maximum shoot regeneration rate was 202.50±20.75 shoots/responding
explant with a response rate of 100%. An efficient protocol for indirect shoot
induction of G. procumbens was culturing node explants on MS medium with 8.87
μM BA and 0.45 μM 2, 4-D for 8 weeks prior to transfer to culture on MS medium
with 4.44 μM BA for 4 weeks and further culture on MS medium without plant
growth regulator for 4 weeks. After the total of 16 weeks of culturing, maximum
shoot induction rates of 71.28±18.11 shoots/responding explant with a responding rate
of 100% were achieved. Indirect shoot organogenesis of leaf and internode explants
was also obtained, however, with lower induction and response rates than those of
node explants. Rooting was spontaneously revealed on MS medium without PGR.
Rooted plantlets were successfully transferred to a mixture of sand and rice shell ash
with 95% survival. The regenerants grew as normal under field conditions. The
amounts of stigmasteryl and sitosteryl-3-O-β-D-glucopyranosides from 2-5 monthsold
plant materials were between 0.42 to 0.74 mg/g dried weight (calculation based on
stigmasteryl-3-O-β-D-glucopyranoside). The established protocols can be used as a
guideline for the production of high quality plant material of Gynura procumbens for
the herbal industry.