Fig. 4.

Relationships between CO₂ compensation point (Г) and M/BS tissue area ratio (a), M/BS cell size ratio (b), the ratio of chloroplasts located in the inner half of BS cells (c), the ratio of mitochondria located in the inner half of BS cells (d), the ratio of mitochondria located in the inner position of M cells (e), size of BS mitochondria (f), number of chloroplasts per BS cell (g), and number of mitochondria per BS cell (h) in Chenopodium species. Filled circles, non-Kranz type; white circles, proto-Kranz type; triangles, Kranz-like type. Significant at P: * < 0.05; ** < 0.01; *** < 0.001