Table 2 Morphometric assessments of chloroplasts in expanded leaves of winter and summer (±SD, n = 36)

Number of chloroplasts per palisade cell section

10.7 ± 2.2^a

16.8 ± 3.5^b

Number of chloroplasts per spongy cell section

5.1 ± 1.4^a

8.8 ± 2.3^b

Relative volume (%) of grana per chloroplast

18.3 ± 5.5^a

42.1 ± 8.6^b

Relative volume (%) of starch grains per chloroplast

3.4. ± 1.2^a

14.5 ± 3.7^b

Relative volume (%) of plastoglobuli per chloroplast

6.8 ± 1.6^a

4.2 ± 0.9^b