1. The formation of enzymes of the oxidative and reductive pentose phosphate cycle was followed in developing rye seedlings. Ribulose diphosphate carboxylase and transketolase are absent in dry seeds; ribose phosphate isomerase is found only in trace amounts. In light as well as in the dark
In tissue cultures of Nicotiana tabacum L. ribulose-diphosphate carboxylase and NADP-dependent glyceraldehyde-3-phosphate dehydrogenase can be found only after transfer of the tissue to light. The increase of the activities of these enzymes parallels that of chlorophyll.The increase in
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