Effect of phytochrome activation followed by prolonged dark incubation on chloroplast development in etiolated cucumber cotyledons |
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Authors: | Lila Cohen Tova Arzee |
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Institution: | Dept of Botany, The George S. Wise Faculty of Life Sciences, Tel Aviv Univ., Tel Aviv 69978, Israel. |
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Abstract: | The inhibitory effect of a short red light pulse followed by prolonged dark incubation on chlorophyll accumulation in etiolated cucumber cotyledons ( Cucumis sativus L. cv. Elem) was reflected in the development of the internal membrane system of the mesophyll plastids. Dark incubation for 24 h after phytochrome activation produced the characteristic accelerating effect OB chlorophyll synthesis and chloroplast development. However, longer intervening dark periods (48, 72 and 96 h) before white light exposure resulted not only in a diminished capacity to concentrate chlorophyll, but also in an impaired ability to form grana. The absence of stacking was consistent with a high chlorophyll a to chlorophyll b ratio. |
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Keywords: | Chlorophyll Cucumis sativus etioplast protochlorophyll |
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