Morphological and anatomical study of 12-day-old wild-type and bsd2 mutant plants. a Morphology of 12-day-old wild type and bsd-2 mutant plants (scalebar:4cm). b Cross sections of the third leaf tip of the wild type and bsd2 plants. Scalebars:20μm. c Ultra structure of the BS and M chloroplasts in the third leaf of the wild type and bsd2 plants. BS: sheath cells, M: mesophyll cells. Scale bars: 2 μm (1 and 4) and 0.5 μm (2, 3, 5 and 6). Sg, starch granule, Od, osmiophilic droplet.