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넝탕부,최기영,김일섭 (사) 한국생물환경조절학회 2014 시설원예‧식물공장 Vol.23 No.3
This study evaluated the effect of water content in the substrate during pre- and post-grafting period onthe survival rate and quality of tomato plug seedlings. Nine combinations of three water levels (high, medium, andlow) were set up in the substrate of both scion and rootstock. The water content in the substrate of the scion didnot affect the survival rate of grafted tomato seedlings, while the survival rate was statically different among thevarious water contents in the substrate of the rootstock. The maximum survival rates (100%) were observed inseedlings treated with high water levels in the substrate of the rootstock, and the survival rates declined withdecreasing water content in the rootstock substrate. The growth characteristics were not significantly affected bydifferent water content in the scion substrate, while they were statically different among the seedlings treated withvarious water contents in the rootstock substrate. The growth characteristics decreased with decreasing water contentin the rootstock substrate. The highest value of compactness was observed in grafted seedlings, which combinedmedium water level in the scion and high water level in the rootstock substrate treatment. The rootmorphology of tomato seedlings was also affected by water content in the rootstock substrate. The total root surfacearea, total root length, and number of root tips decreased with deceasing water content in the rootstock substrate.
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넝탕부,김승연,김시홍,최기영,김일섭 (사) 한국생물환경조절학회 2015 생물환경조절학회지 Vol.24 No.2
The objective of this study was to evaluate the effect of silicate fertilizer on growth, physiology and abiotic stress tolerance of Chinese cabbage seedlings. Five silicate concentrations (8, 16, 32, 64, and 128mM) and control (non-treatment) were applied to Chinese cabbage seedlings twice a week. Three weeks after application of silicate treatment, seedlings were used for treating abiotic stresses and were assessed for growth and physiological characteristics. Growth parameters significantly increased in 8, 16, and 32mM treatments except 64 and 128mM. Total root surface area, total root length, and number of root tips increased in 8, 16 and 32mM treatments, but they decreased in treated seedlings with 64 and 128mM of silicate. The highest growth parameters and root morphology were observed in 8mM treatment. As for the effect on the seedling physiology, transpiration rates decreased while stomatal diffusive resistance increased to increasing silicate concentration. The application of silicate reduced the electrical conductivity, heating and chilling injury index at high and low temperatures. Silicate enhanced drought tolerance of Chinese seedlings by delaying the starting time of wilting point. The starting time of wilting point in the control was 3 days after discontinuation of irrigation, while in the 8, 64 and 128mM of silicate treatments were 4 days, and the 16 and 32mM treatments were 5 days. All plants were wilted after 5 days in control without irrigation whereas it showed in 8mM treatment after 6 days, in 16, 32, 64, 128mM treatments after 7 days.
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김일섭,넝탕부,후앙텅부,최기영,김영식 (사) 한국생물환경조절학회 2015 시설원예‧식물공장 Vol.24 No.1
This study was conducted to evaluate influence of short-term application of abscisic acid (ABA) in nutrientsolution on growth and drought tolerance of tomato seedlings. The treatments included four ABA concentrations(0.5, 1, 2, 3mg·L-1) and control (non-treatment) were applied to the nutrient solution in a hydroponic system. On the5th and 10th day after growing in the nutrient solution containing ABA, seedlings were transferred to -5 bars of PEG-8000 in a growth chamber to induce water stress. Except for stem diameter and fresh and dry weight of root, therewere no statistical differences in other growth parameters among control, 0.5 and 1mg·L-1 of ABA treatments. Seedlingsgrowths were strongly inhibited in nutrient solution containing 2 and 3mg·L−1 of ABA. The root growth such asfresh and dry weigh of root, total root surface area, and average root diameter was slightly enhanced in 1mg·L−1 ofABA treatment. The elevation of ABA concentrations in nutrient solution resulted in the decrease in transpirationrate and increase in stomatal diffusive resistance and leaf temperature of tomato seedlings. The initiations of seedlingwilting after treating in -5 bars of PEG were delayed from 10 hrs in control to 30 hrs in ABA applied treatments. Additionally, the high percentages of recovered seedlings were observed in 0.5 and 1mg·L−1 of ABAtreatments after re-irrigation. Therefore, short-term application of 1mg·L−1 of ABA in the nutrient solution stimulatedthe root growth and drought tolerance of tomato seedlings by delaying the start time of wilting point andenhancing the recovery after re-irrigation.
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