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Plant and Cell Physiology, 1979, Vol. 20, No. 8 1511-1522
© 1979

Article

Comparison between the preservation of chloroplast structure in the dark and the turnover rate of chlorophyll-protein complexes in a moss and two varieties of pea

Niina Valanne1, Arja Pennanen and Elina Vapaavuori

Department of Botany, University of Helsinki Unioninkatu 44, 00170 Helsinki 17, Finland

The senescence and preservation of the structure of the chloroplast in the dark was studied in the protonema of Ceratodon purpureus and in two varieties of pea, a tall variety "Dippe Maj" and a dwarf variety "Early low". The latter variety is better able to survive in darkness, probably because of the larger amount of starch in its chloroplasts. The integrity of the chloroplasts was better preserved in the moss than in the peas. During isolation of the chlorophyll-protein complexes, there was no decrease in the specific activity of the total lamellar extract in any of the dark-grown materials. This contrasts with the turnover of chlorophyll-protein complex (CP) II in the dark-grown moss. In the light, CP II had a half life of two weeks in both the moss and the higher plants, whereas no turnover was evident in CP I. The lack of turnover for CP I is connected with its decrease in senescence.

1Present address: Department of Botany, University of Turku, 20500 Turku 50, Finland.

(Received July 13, 1979; )
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