Fig. 1

Optical and scanning electron microscopy observation of grain phenotype and starch granule structure. a-c The sug-h mutant grain exhibits a phenotype that is intermediate between that of the wild type and sug-1. Bars = 4 mm. d-i Cross sections of wild-type, sug-1, and sug-h kernels at the mature stage. Sectioned seeds were stained with iodine solution. Bars = 0.5 mm. j-o SEM observations of wild-type, sug-1, and sug-h mutant endosperm. j-l Bars = 0.5 mm. (m-o) Bars = 10 μm. p-r SEM observations of starch granule structures in wild-type, sug-1, and sug-h mutant endosperm. Bars = 10 μm