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Plant Physiology 46:247-249 (1970)
© 1970 American Society of Plant Biologists

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Articles

Photoinduced Changes in the Chlorophyll a to Chlorophyll b Ratio in Young Bean Plants

J. H. Argyroudi-Akoyunoglou and G. Akoyunoglou

a Nuclear Research Center "Democritus," Greek Atomic Energy Commission, Athens, Greece

An alternating light-dark system is described under which etiolated bean (Phaseolus vulgaris) leaves form selectively chlorophyll a.

This system consists of cycles of 2 minutes of white light alternating with 98-minute dark periods.

Etiolated tissue exposed to a series of such light-dark cycles accumulates chlorophyll a predominantly, with no lag phase in its biosynthesis. A very high ratio of chlorophyll a:chlorophyll b is thus established. The ratio increases with the number of light exposures up to about 45 such exposures and then it declines. Transfer of the etiolated tissue to continuous illumination after a number of such light exposures results in a dramatic drop of the chlorophyll a:chlorophyll b ratio to values normally found in green plants.




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L.-A. Tziveleka and J. H. Argyroudi-Akoyunoglou
Implications of a Developmental-Stage-Dependent Thylakoid-Bound Protease in the Stabilization of the Light-Harvesting Pigment-Protein Complex Serving Photosystem II during Thylakoid Biogenesis in Red Kidney Bean
Plant Physiology, July 1, 1998; 117(3): 961 - 970.
[Abstract] [Full Text]


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Copyright © 1970 by the American Society of Plant Biologists