Fig. 4

The chloroplast ultrastructure was observed in the flag leaves of the rice varieties Purnendu (a, e), Swarnaprabha (b, f), IR64 (c, g), and IR8 (d, h) during the reproductive stage. (a–h) represent the chloroplasts in normal light (NL) and low light (LL) conditions, respectively. The differences were observed in the number of thylakoid membranes (Th), starch granules (Sg), and plastoglobulin (Pg) as indicated by arrowheads in NL and LL conditions.