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Subject: search.filters.subject.Plant growth regulator

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    Paclobutrazol enhances yield and secondary compound accumulation in Curcuma longa L.
    (2024-11-01)
    Montri, N.
    ;
    Chauytam, S.
    ;
    Deewatthanawong, R.
    ;
    Bunya-Atichart, K.
    The results indicated that the application of different concentrations of PBZ at 60 days preharvest had an impact on yield after harvest at 9 months while the color of turmeric remained relatively consistent. In all treatments, the rhizome color was yellow to orange. The fresh weight of the rhizome showed no significant differences within the range of 0-800 mg/L PBZ treatments, with the lowest yield observed in 1,200 mg/L PBZ treatment. The dry weight percentage was highest when treated with 800 mg/L PBZ for the mother rhizome and 600 mg/L PBZ for the finger rhizome. Regarding the accumulation of secondary compounds, highly significant differences among the treatments were found for the content of total flavonoids and total phenolics while curcumin showed significant differences. The treatment with 1,200 mg/L PBZ had the highest total phenolics content at 78.18 mg GAE/gDW and total flavonoids at 295.54 mg QUE/gDW. PBZ-treated plants also showed higher curcumin content and percentage than the non-treated plants. These findings indicated that the application of PBZ has the potential to improve both the yield and quality of turmeric, which is advantageous for cultivating this valuable medicinal plant.
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    Effect of paclobutrazol on growth retarding in potted chrysanthemum (Dendranthema grandiflora)
    (2024-03-01)
    Piphatwatthanakul, P.
    ;
    Boonkamjat, T.
    ;
    Saetiew, K.
    Paclobutrazol application was compared to the control. It showed a positive influence in reducing stem height, canopy width, internode length, node number, and flower size. Besides, methods of application were insignificantly found. As for the second experiment, decreased concentrations to 0, 100, 200, 300, and 400 ppm of paclobutrazol were tested, using the same manner of application as in the first experiment. It appeared that all concentrations of paclobutrazol decreased canopy width, stem length, internode length, and node number when compared with the control treatment, similar to results of the experiment 1. Nevertheless, it occurred in Prakaimat variety that both foliar spraying and soil drenching of paclobutrazol led to increasing chlorophyll content and carotenoid level. Meanwhile, Fiona chrysanthemum responded better to foliar spraying method than of soil drenching.
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    Influence of plant growth regulators on shoot development of Chrysanthemums
    (2024-01-01)
    Boonkamjat, T.
    ;
    Saetiew, K.
    ;
    Teerarak, M.
    Plant nodes were cultured on MS mediums supplemented with multiple concentrations of plant growth regulators. Sunny Snow produced the largest callus of 1.19×1.19 cm and obtained 93.33% of new shoots with 10 . 0 0 shoots per callus, and 0. 84 g callus fresh weight, when grew in MS medium supplemented with 1 mg/l BA + 0.1 mg/l IAA as compared to the control which no callus was produced. After 20 weeks of culturing, the second set showed that the control treatment of Sunny Snow gave the highest stem growth and the best canopy size of 9.00 and 5.60 cm respectively. Chompoo Phan gave the highest scores of chlorophyll content, i.e., chl a 652.14 µg/g FW, chl b 332.47 µg/g FW and carotenoid 165.92 µg/g FW. Besides, MDA appeared to be highest, 17.37 nmol/g FW when cultured on MS medium supplemented with 1 mg/l BA + 0.1 mg/l IAA.
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    Effect of growth regulator on shoot induction from protocorm of Dendrobium Anna
    (2020-12-01)
    Anuchai, J.
    ;
    Sasiangdee, A.
    Result showed that after 8 weeks of culture, treatment which supplemented with BA 2 mg/l was revealed to be suitable as a medium in tissue culture of Dendrobium. It showed the highest number of shoot (19.6 shoots), shoot length (1.30 cm), fresh weight (1.82 g), dry weight (0.28 g), chlorophyll A and chlorophyll B (0.19 and 0.11 mg/g FW, respectively) in treatment which supplemented with BA 2 mg/l. Total non-structural carbohydrate (TNC) showed the highest value in treatment which supplemented with NAA 0.5 and BA 0 mg/l (5.54 mg/FW). Therefore, the supplemented with BA 2 mg/l enhanced shoot induction of Dendrobium from protocorm culture and recommended for commercial production.