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KMID : 0368419980410040304
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Journal of Plant Biology
1998 Volume.41 No. 4 p.304 ~ p.311
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The Inrolling Phenomena of Petals During Senescence in Cut Carnations(Dianthus caryophyllus L. cv. Shinkibo)
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Kim, Eung Soo
Ki, Cheol Son/Lee, Sun Hi/Oh, Seung Eun
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Abstract
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The inward rolling of the petals is one of typical symptoms observed hi the process of climacteric corolla senescence. Inrolling was mimicked by treating the lower part of the petal instead of the whole petal of cut carnations (cv. Shinkibo) with exogenous ethylene. In these petal segments, the climacteric ethylene burst occurred right at the inrolling stage, indicating that these petal segments may be an excellent model system for examining corolla senescence. According to kinetic analysis, an asymmetry in the lengths of the adaxial and abaxial sides of petal segments appeared to be the direct cause of the inward rolling. While the length of the abaxial side of the transverse section of petal segments increased during the analysis, the ultimate length of the adaxial side was shrunken by the same ethylene action. Interestingly, the kinetics curve of the adaxial side consisted of two distinct phases. The rate of expansion/shrink of either side of the petal and the slope of each phase varied with the chemicals affected in the rolling process of the petal segments: e.g., n-octanoic acid, polyamines, and inhibitors of the Ca^(2+)-channel blocker.
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