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    Ripening control of nam dok mai mango (Mangifera indica Linn.) with titanium dioxide
    (2019-01-01)
    Chaishome, Jedsada
    ;
    Tunsathitsak, Yossakorn
    ;
    Boonyaritthongchai, Panida
    ;
    Supapvanich, Suriyan
    — This research aims to slow down the release of ethylene of ‘Nam Dok Mai’ mango during shipment transportation by using titanium dioxide as an absorbent. The result found that the mango begin to the ripening process after stored at 13°C for 12 days (ethylene and carbon dioxide around 0.06910 µL C2H4/kg.hr and 32.10 mg CO2/kg.hr, respectively). Then, the appropriate titanium dioxide was tested by trial at 3, 5 and 10 grams. The result showed that titanium dioxide decreased ethylene but each treatment were not statistically different (p <0.05). Afterward, all fruits were stored at 13°C for 14 days and at 25°C for 4 days, respectively. The physical and chemical properties of fruit were analyzed during storage time. After 14 days at 13°C, firmness, color, titratable acidity, pH, total soluble solids and ripening index of the treatments of titanium dioxide and control treatment were significant different. After 4 days at 25°C, the ripening process of fruit between titanium dioxide treatment and control treatment were not significant differences.
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    Efficiency of antioxidant and absorbent on browning and the optimal factors of plant regeneration from young seed of gluta usitata (217 Mae Ka) by Tissue Culture
    (2018-11-01)
    Rakrawee, R.
    ;
    Kittibanpacha, K.
    ;
    Chareonsap, P. P.
    ;
    Poeaim, A.
    Gluta usitata (Anacardiaceae) is a lacquer tree and create lacquer varnish can be utilized in many aspects especially art and culture. Recently, its harvest faced troublesome and yields of varnish tree are decreased. Consequently, the conservation of plant has reduced, and this plant has become extinct. The experiment was chosen to use plant tissue culture technique to preserve and increase this plant. The experiment was compared the effect of Woody Plant Medium (WPM) combined with different concentration of antioxidants were 2, 4, 6, 8 g/L Poly Vinyl Pyrrolidone (PVP), 20, 30, 40, 60 mg/L ascorbic acid or citric acid and absorbents of 1, 2, 3 g/L activated charcoal to reduce browning of phenolic compound in the explants. The results showed that 2 g/L activated charcoal gave the lowest of browning on seed and medium (about 0.9±0.2 points). The addition of 40 mg/L ascorbic acid was generated the highest of shoots (approximately 1.88±0.4 shoots/seed) after culture for 4 weeks. in vitro propagation of seed germination on WPM supplemented with 0.5, 1, 1.5, 2 and 3 mg/L 6-Benzyl amino purine (BAP), Thidiazuron (TDZ) and meta-Topolin (mT) 3% sucrose and 0.2% phytagel was efficiently resulted. Other result revealed that 1.5 mg/L BAP, 2 mg/L TDZ and 2 mg/L mT gave the highest seed germination at 1.6±0.2, 1.8±0.2 and 1.6±0.2 shoots/seed, respectively. The best of plant growth regulators for seed germination was 2 mg/L of TDZ after 6 weeks.