TABLE 3.

Ultrastructural parameters for the bundle sheath cells in cross section of two C₄ species and three C₃ species from the Nyctagineae tribe of the Nyctaginaceae.

	A. incarnata	An. gypsogenus	B. coccinea	C. scandens	N. capitata
	C4	C3	C4	C3	C3
Cell area, μm2	427 ± 169 a	727 ± 339 a	557 ± 183 a	505 ± 199 a	944 ± 389 a
% Cell covered by chloroplast,%	28.3 ± 5.9 b	2.3 ± 0.9 a	35.2 ± 11.5 b	13.8 ± 4.6 a	6.5 ± 4.2 a
% Cell area covered by mitochondria,%	3.6 ± 1.7 b	0.4 ± 0.2 a	1.2 ± 0.5 a	0.6 ± 0.3 a	0.5 ± 0.4 a
Number of chloroplasts per cell	16 (5–24) b	5 (2–11) a	18 (3–37) c	10 (7–15) b	10 (5–17) b
Number of mitochondria per cell	45 (12–111) c	14 (4–57) a	28 (4.8–75) b	13 (5–30) a	11 (7–52) a
Area per chloroplast, μm2	8.3 ± 3 c	2.9 ± 1.1 ab	11.4 ± 3.8 c	6.1 ± 2.1 bc	5.3 ± 1.2 bc
Area per mitochondria, μm2	0.7 ± 0.2 b	0.3 ± 0.1 a	0.4 ± 0.1 a	0.5 ± 0.2 ab	0.3 ± 0.2 a

Means ± SE, or median ± range for organelle numbers. N = 3–5. Letters besides values indicate statistically distinct groups by Kruskal Wallis test followed by a Dunn’s test except for organelle numbers which are evaluated using a Poisson regression for count data (number of organelles per cell). Abbreviations: A, Allionia; An, Anulocaulis; B, Boerhavia, C, Commicarpus; N, Nyctaginia.