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Articles

Chloroplast Aldolase is Controlled by a Nuclear Gene ¹

^a Department of Biological Sciences, University of Illinois at Chicago Circle, Chicago, Illinois 60680

Variant chloroplast fructose 1,6-diphosphate aldolases were found in Pisum sativum when 10 commercial varieties were examined for electrophoretically distinct species of chloroplast triose phosphate isomerase, phosphoglyceric acid kinase, glyceraldehyde 3-phosphate dehydrogenase, and aldolase. When reciprocal crosses are made, both aldolases appear in individuals in the F₁ generation. Backcrossing gives offspring having aldolases characteristic of the homozygous or of the heterozygous parent; the inheritance is therefore not maternal but Mendelian. Clearly this chloroplast reductive pentose phosphate cycle enzyme is under nuclear gene control in P. sativum.

¹ Supported by National Science Foundation Grants GB 8626 and GB 6743.