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Nitrogen Nutrition and Photosynthesis in Sugar Beet (Beta vulgaris L.)¹

Nitrogen deficiency was evaluated as an ecological factor affecting CO₂ assimilation in sugar beet (Beta vulgaris L.) leaves. Nitrogen deficiency reduced the chlorophyll concentration and photochemical capacity of the older leaves but not of young and recently mature leaves. The maximum rate of photosynthesis was reduced in leaves of all ages. This was correlated with a smaller leaf protein content and with an increase in CO₂ diffusion resistances. Although the rate of photosynthesis was reduced as much as 40% when plants were grown for 14 days without nitrogen, the effects were reversible, and activity could be restored to the normal rate within 4 days by adding nitrate nitrogen to the deficient nutrient solution.

Key Words: CO₂ diffusion resistance • N deficiency

² Department of Botany, Iowa State University, Ames 50010, and Department of Agronomy, University of California, Davis 95616.

Received for publication December 16, 1968.