Fig. 2

Cellular analyses of spikelet hull and endosperm of PYZX and P02428 grains. a Cross-section of spikelet hull. Upper: cross-section of spikelet hull (100×). Dotted line indicates position of cross-section. Lower: magnified view of spikelet hull cross-section. b Comparison of total cell number and mean cell length in the cross-section of outer glume cell layers of spikelet hull. c Scanning electron microscopy photos of outer glume surfaces (500×). d Comparison of total cell number and mean cell length in the outer glume surface of spikelet hull. e Scanning electron microscopy images of transverse sections from the endosperm bellies of mature seeds (3000×). ***P < 0.001; Student’s t test was used to generate the P values in (b) and (d)