Discrete character of the development of the photosynthetic apparatus in greening barley leaves |
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Authors: | Radyuk Mechislav S Homan Natalia M |
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Institution: | (1) National Academy of Sciences of Belarus, Institute of Photobiology, Akademicheskaya st. 27, Minsk, 220072, Belarus |
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Abstract: | Biogenesis of the photosynthetic apparatus in greening etiolated leaves of barley (Hordeum vulgare L) was investigated by an approach permitting investigation of this process under conditions that minimize differences in
plastid development. Distributions of barley leaves greening for 24 h as to chlorophyll content and of chloroplast grana as
to number of thylakoids were shown to be of a multimodal character. The shape of time-course curves of chlorophyll accumulation
in local sites of greening etiolated leaves was of a stepped or (at the end of greening) undulated character. The stepwise
accumulation of chlorophyll was accompanied by wave-like changes in chlorophyll b/a ratio, intensity of low-temperature chlorophyll fluorescence and photosynthetic activity with minima at the time points of
transition to accelerated chlorophyll accumulation. It is assumed that (1) development of the photosynthetic apparatus in
local sites of greening etiolated leaves occurs stepwise, from one steady level to another, but not as gradually as is generally
accepted, and (2) every separate step in development of the photosynthetic apparatus seems to begin with formation of photosystem
cores and to end with the synthesis of light-harvesting complexes.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | chloroplast development chlorophyll accumulation fluorescence oxygen evolution |
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