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Pretreatment of plants with ethylenediurea (EDU, N-[2-(2-oxo-1-imidazolidinyl) ethyl]-N'-phenylurea) protects plants from foliar injury caused by ozone (O_3), but the fundamental mechanisms underlying... this protection are poorly understood. A low-temperature scanning electron microscope (LtSEM) study revealed that following O_3 treatment, plants treated with EDU as a soil drench 48h prior to O_3 exposure exhibited greater numbers of stomata with closed apertures than those exposed to O_3 without EDU pretreatment. Stomatal resistance was increased significantly by O_3 in control and EDU-treated plants; however, this increase was maximal in plants pretreated with EDU. Photosynthetic rate was reduced significantly in EDU pretreated plants exposed to O_3 than treated with O_3 only. These results suggest that EDU increased stomatal closure during O_3 exposure, and thereby decreased O_3 uptake and toxicity.続きを見る
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Mendeley出力
KJ00004506911