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Plant Physiology 87:46-49 (1988)
© 1988 American Society of Plant Biologists

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Metabolism and Enzymology

Regulation of Photosynthesis in Nitrogen Deficient Wheat Seedlings

Felix Mächler, Astrid Oberson, Anton Grub and Josef Nösberger

Institut für Pflanzenwissenschaften, Eidgenössische Technische Hochschule, Universitätstrasse 2, CH-8092 Zürich, Switzerland

Nitrogen effects on the regulation of photosynthesis in wheat (Triticum aestivum L., cv Remia) seedlings were examined. Ribulose 1,5-bisphosphate carboxylase/oxygenase was rapidly extracted and tested for initial activity and for activity after incubation in presence of CO2 and Mg2+. Freeze clamped leaf segments were extracted for determinations of foliar steady state levels of ribulose 1,5-bisphosphate, triose phosphate, 3-phosphoglycerate, ATP, and ADP. Nitrogen deficient leaves showed increased ATP/ADP and triose phosphate/3-phosphoglycerate ratios suggesting increased assimilatory power. Ribulose 1,5-bisphosphate levels were decreased due to reduced pentose phosphate reductive cycle activity. Nevertheless, photosynthesis appeared to be limited by ribulose 1,5-bisphosphate carboxylase/oxygenase, independent of nitrogen nutrition. Its degree of activation was increased in nitrogen deficient plants and provided for maximum photosynthesis at decreased enzyme protein levels. It is suggested that ribulose 1,5-bisphosphate carboxylase/oxygenase activity is regulated according to the amount of assimilatory power.




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