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. 1973 Feb;51(2):245–249. doi: 10.1104/pp.51.2.245

Functional and Structural Changes in Senescing Populus deltoides (Bartr.) Chloroplasts 1

Rubén Hernández-Gil a,2, Michail Schaedle a
PMCID: PMC366244  PMID: 16658309

Abstract

Chloroplasts isolated from Populus deltoides leaves were used to study age-dependent changes in the rate of cyclic photophosphorylation. Single leaves were used to measure CO2 fixation by leaf discs, chlorophyll concentration, and ATP synthesis. The ability of chloroplasts to synthesize ATP diminished steadily from the time of full leaf expansion, regardless whether the results are expressed on a leaf area or chlorophyll basis. This decline in the rates of ATP synthesis was paralleled by the decline in the rate of CO2 fixation. The results suggest that the efficiency of the membrane-bound ATP synthesizing system declines with age.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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