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KMID : 1024519970060020125
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Journal of the Environmental Sciences
1997 Volume.6 No. 2 p.125 ~ p.131
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The Mechanism of Stomatal Closing by H₂O₂ in Epidermal Strips of Commelina communis L.
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Lee Joon-Sang
Jun Bang-Ook
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Abstract
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The mechanism of stomatal closing in response to was indirectly investigated by using which is the intermediate product of metabolites. Stomata in epidermal strips close in response to . The effect of on stomatal closing was dependent on the concentration of . 10 ppm showed a clear effect on stomatal closing and 1000 ppm induced complete stomatal closing after the treatment of 3 hours. Stomatal closing by in intact leaf was also observed by measuring the diffusion resistance with porometer. It was found that the stomatal closing by was not mediated by , and that was a different result observed in stomatal closing by water stress. Reversely, showed a great inhibition on stomatal closing. The leakage of K+ in epidermal strips was doubled in response to when it was campared to the control. 10 ppm decreased photosynthetic activity. Fv/Fm representing the activity of Photosystem II was reduced about 4 % in 10 ppm and 8 % in 100 ppm In the treatment of 1.5 hour. However, stomatal closing by 10 ppm was reduced about 56 %. According1y, it can be suggested that stomatal closing by is related with the decrease of photosynthetic activity, but it was chiefly induced by the change of the membrane permeability. Key words Commelina communis, stomatal closing, , , photosynthesis.
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KEYWORD
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Commelina communis, stomatal closing H₂O₂, Ca2+ photosynthesis
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