Changes in Chlorophyll a and b Content in Dark-Incubated Cotyledons Excised from Illuminated Seedlings: THE EFFECT OF CALCIUM |
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Authors: | Tanaka A Tsuji H |
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Affiliation: | Laboratory for Plant Ecological Studies, Faculty of Science, Kyoto University, Kyoto 606, Japan. |
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Abstract: | Cucumber seedlings were illuminated for various time periods, cotyledons excised, placed in the dark, and changes in chlorophyll a and b content monitored. During the dark periods, chlorophyll b content decreased while chlorophyll a did not. When the illumination time was lengthened, the percentage of chlorophyll b decomposition from initial levels decreased. Ca2+ at 50 millimolar prevented the decrease in chlorophyll b and caused a decrease in chlorophyll a. The effect of Ca2+ decreased with increased illumination time. Cycloheximide and chloramphenicol inhibited chlorophyll b decrease, but did not induce chlorophyll a decrease. |
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