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Author: search.filters.author.Jogloy, SanunHas files: No

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    Adaptive responses of Jerusalem artichoke to mid-season drought: effects on phenolic compounds and p-coumaric acid content
    (2025-12-01)
    Ruttanaprasert, Ruttanachira
    ;
    Jogloy, Sanun
    ;
    Janket, Anon
    ;
    Siripipatthana, Patthraporn
    ;
    Senawong, Thanaset
    Background: Drought stress can influence the accumulation of phenolic compounds in plants. This study investigated the adaptive response of Jerusalem artichoke to mid-season drought stress, focusing on changes in total phenolic content and p-coumaric acid contents. Methods: A pot experiment was conducted using a 2 × 5 factorial arrangement in a randomized complete block design with three replications. Factor A comprised two irrigation treatments: field capacity (FC) and mid-season drought stress (maintaining 50% available soil water [50% AW] from 31 to 60 days after transplanting). Factor B included five Jerusalem artichoke genotypes with varying levels of drought resistance: JA 3, JA 125, JA 15, JA 89, and CN52867. Results: Mid-season drought significantly decreased leaf relative water content at 60 days after transplanting of Jerusalem artichoke in both years (73.2% in year 1 and 74.2% in year 2). Drought significantly affects total phenolic content in leaf and stem at 90 DAT but does not affect TPC in tuber. Genotype JA 125 showed high total phenolic content under drought conditions in leaf (38.3 mg GAE/g dry weight), stem (24.3 mg GAE/g dry weight) and tuber (9.0 mg GAE/g dry weight), especially in the second year. The JA3 genotype showed stability for increased accumulation of total phenolic contents under drought stress and this genotype also accumulated the highest p-coumaric acid (15.4 mg GAE/g dry weight) under drought stress. These findings highlight the potential of Jerusalem artichoke as a source of bioactive compounds and these genotypes can serve as breeding sources to enhance the drought resistance and high phenolic content of Jerusalem artichoke.
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    Impact of Mid-Season Drought on Tuber Yield, Biomass, Harvest Index, and Water-Use Efficiency of Jerusalem Artichoke in Tropical Regions
    (2025-02-01)
    Ruttanaprasert, Ruttanachira
    ;
    Jogloy, Sanun
    ;
    Kaewkhieo-Ngam, Thanawat
    ;
    Janket, Anon
    ;
    Puttha, Ratchanee
    Mid-season drought is increasingly recognized as a major constraint on tuber production in Jerusalem artichoke. The ability of different genotypes to maintain high yields under such conditions is a critical component of drought tolerance. This study aimed to investigate the effects of mid-season drought on tuber yield, biomass, harvest index, tuber water-use efficiency (WUEt), and biomass water-use efficiency (WUEb) across various Jerusalem artichoke genotypes with differing levels of drought tolerance. The experiment was conducted in pots using a 2 × 5 factorial combination in a randomized complete block design with four replications over two years. Factor A consisted of two water regimes: field capacity (FC) and mid-season drought. Factor B included five genotypes: JA 3, JA 125, JA 15, JA 89, and CN 52867. Mid-season drought significantly reduced tuber dry weight, biomass, WUEt, and WUEb, while increasing the harvest index. Significant differences were observed among genotypes for tuber dry weight, biomass, harvest index, WUEt, and WUEb under both water regimes. CN 52867 and JA 89 were characterized as drought-tolerant genotypes with high water-use efficiency and high yield potential. JA 3 was also noted for its lower yield reduction under stress. These three genotypes serve as valuable genetic resources for breeding programs aimed at developing progeny populations with enhanced yield potential and drought tolerance, particularly for mid-season drought-prone environments.
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    Genotypic Variability of Total Phenolic Compounds and Antioxidant Activity in Jerusalem Artichoke (Helianthus tuberosus L.) Germplasm
    (2024-01-01)
    Ruttanaprasert, Ruttanachira
    ;
    Jogloy, Sanun
    ;
    Sennoi, Rattikarn
    ;
    Aninbon, Chorkaew
    ;
    Puttha, Ratchanee
    This research examines the variability in tuber yield, yield component, phenolic compounds, and antioxidant activity of twenty-five Jerusalem artichoke genotypes. The field experiment is arranged using a randomized complete block design with three replications. The plant tubers are harvested at maturity and recorded for tuber dry weight, total phenolic content, and antioxidant activity. The results show significant genetic variations in tuber dry weight, phenolic content, and antioxidant activity determined by FRAP and ABTS methods. Significant and positive correlations are found among individual tuber dry weight, number of tubers per plant, tuber dry weight, including phenolic content, and antioxidant activity determined by the FRAPmethod. Jerusalem artichoke genotypes are classified into five groups based on tuber dry weight, phenolic content, and antioxidant activity determined by DPPH and FRAP methods. KT504 is identified as the accession with high levels of tuber dry weight, phenolic content, and antioxidant activity, and this genotype might be used as a material source for the pharmaceutical industry. Total phenolic content in the tuber can serve as an index for selecting Jerusalem artichoke genotypes with direct high antioxidant activity.