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Subject: search.filters.subject.Ethephon

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    Evaluating variety and ethephon effect on banana fruit quality at different ripening stages: A comparative and multivariate approach
    (2025-03-01)
    Laryea, Damian
    ;
    Supapvanich, Suriyan
    ;
    Pinsirodom, Praphan
    ;
    Suwapanich, Rachit
    ;
    Arsa, Supeeraya
    The purpose of this study was to investigate the effect variety, ethephon and their interaction may have on banana fruit quality at different ripening stages using comparative and multivariate approach. Three varieties of banana (Musa AAB, Musa AAA, Musa AA) were treated with ethephon (0 mg/kg and 1000 mg/kg), allowed to ripen and analyzed at the fully ripe and overripe stages. Although varieties were significantly different in terms of their peel and pulp colour at the fully ripe and overripe stages, ethephon had no significant effect (p < 0.05) on these qualities except for the lightness (L∗) and whiteness index of the pulp. While variety significantly (p < 0.05) affected the TSS (Total soluble solids), pH, TA (Titratable acidity), TSS/TA ratio and firmness, ethephon only affected the firmness at the fully ripe stage and both firmness and TA at the overripe stage. There were significant differences (p < 0.05) observed among varieties in terms of their total phenols, flavonoids, antioxidant activity (DPPH and FRAP), total sugar and starch at the fully ripe and overripe stages. Ethephon significantly (p < 0.05) increased the total sugar at the fully ripe stage but at the overripe stage it caused a significant (p < 0.05) decrease in both total sugar and FRAP. In most of the quality characteristics assayed, the varieties responded in the same way to the ethephon treatment as shown by the interaction effect. Further multivariate analysis (PCA and HCA) concluded that ethephon treated (1000 mg/kg) samples were not significantly different from untreated (0 mg/kg) samples based on the quality characteristics explored in this study.
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    Influence of ethephon spraying on the growth and yield of Stevia (Stevia rebaudiana Bertoni.)
    (2023-05-01)
    Chumthong, B.
    ;
    Seesanong, S.
    ;
    Detpiratmongkol, S.
    The effects of ethephon spraying on the growth and yield of stevia (Stevia rebaudiana Bertoni) was investigated. The results indicated that spraying ethephon for three times leaded to the highest growth parameters in term of stem, leaf, root and total dried weight and yield, followed by spraying two and one times. The ethephon spraying to stevia at concentration of 200 ppm gave the highest total dried weight and yield. It is concluded that application of ethephon at concentration of 200 ppm to stevia for three times at 30, 60 and 90 DAT gave the highest vegetative growth and yield.
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    Effects of ethephon on growth and yield of sweet sorghum (Sorghum Bicolor L. Moench) at different growth stages
    (2019-09-01)
    Yoosukyingsataporn, Sommart
    ;
    Detpiratmongkol, Somyot
    There is little information about the effects of ethephon ripening hormone on the yield of sweet sorghum in Thailand. Therefore, this study aimed to evaluate the impact of ethephon hormone applied at different growth stages of three cultivars of sweet sorghum on its growth and yield. The experiment was conducted from December 2016 to May 2017 at a research plot of the Faculty of Agricultural Technology, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand. The experiment was designed as a split-plot design with three replications. Three sweet sorghum cultivars (Ethanol 2, KKU 40, and Cowley) were planted in the main plot. Ethephon was applied at five stages of growth of these cultivars: heading stage, panicle stage, milking stage, dough stage, harvesting stage. Ethephon applications at those stages and untreated control were the subplots. Results showed that Ethanol 2 cultivar exhibited a higher growth rate, plant height, stem diameter, grain yield, stem fresh weight, and yield, juice extract yield, and sugar content than those exhibited by KKU 40 and Cowley. Application of ethephon at the heading stage gave the lowest stem diameter, grain yield, stem fresh weight, and yield, whereas applying it at the harvesting stage gave the highest sugar yield. There were no significant correlations between sweet sorghum cultivars and the growth stages at which ethephon was applied. Based on these results, it might be concluded that Ethanol 2 cultivar should be treated with ethephon hormone at its harvesting stage.