C₄ Photosynthesis in Sodium-Deficient Plants

Abstract

The C₄ plants Kochia childsii Hort. and Chloris barbata Sw. showed symptoms characteristic of sodium deficiency. The δ¹³C value, CO₂ compensation point and percentage of ¹⁴C label in C₄ dicarboxylic acids in short-term photosynthesis were similar in sodium-deficient and normal plants. This is consistent with the operation of the C₄ pathway.