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KMID : 0903619960370060767
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Journal of the Korean Society for Horticultural Science
1996 Volume.37 No. 6 p.767 ~ p.772
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Alleviation of Sulfur Dioxide Injury in Snap Bean Plts by Uniconazole
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구자형/Ku, Ja Hyeong
Krizek, Donald T./Mirecki, Roman M.
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Abstract
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This study was carried out to determine the effectiveness of uniconazole[(E)-(p-chlorophenyl)-4, 4-dimethyl-2-(1,2,4-triazol-1-yl)-penten-3-ol] in ameliorating SO₂ injury in snap bean plants in relation to superoxide dismutase (SOD) activity, malondialdehyde (MDA) accumulation, transpiration, chlorophyll concentration, variable chlorophyll fluorescence (Fv), vegetative growth, and yield. Plants were given a soil drench of 0, 0.005, 0.01, or 0.02 ㎎/pot uniconazole, and after 14 days, were fumigated with 1.5 μL/L SO₂ for 2 to 4 h. All concentrations of uniconazole provided protection against SO₂ injury. Higher uniconazole concentrations provided complete protection; little difference was found among the uniconazole treatments after 4 h of SO2. Higher concentrations of uniconazole reduced leaf enlargement and stem elongation by 42 and 53%, respectively, reduced whole plant transpiration, increased SOD activity and total chlorophyll concentration, decreased MDA accumulation, delayed flowering slightly (11.8 d), but had little or no effect on Fv or on number or dry weight of pods. The increase in SOD activity and the decrease in MDA in SO₂ fumigated plants treated with uniconazole were associated with a reduction in pollution injury. These results suggest that uniconazole-induced SO₂ tolerance may be attributed in part to increased antioxidant activity of the plant tissue, thereby reducing cellular damage from oxidative stress. Since stomatal resistance was unaffected by uniconazole treatment, stomatal closure was not a contributing factor to increased SO₂ tolerance.
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KEYWORD
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