(A–H) eGFP fluorescence from endosperm cells (A, C, E, G) and iodine-stained starch granules (B, D, F, H) from developing grains (30 DAP) of plants with transgenic expression of HvGBSSIaWT-eGFP (A, B, E, F) or HvGBSSIaCDC_Alamo-eGFP (C, D, G, H) in the three waxy cultivars CDC Alamo (A–D), CDC Candle (E–H) and SB94912. The results for SB94912 were identical to those of CDC Candle, so for simplicity, only CDC Candle is shown. The scale bars in (A–H) are 50 µm. (I) Relative gene expression levels of HvGBSSIa determined by qPCR in developing grains (10 and 25 DAP) from plants with overexpression of either HvGBSSIaWT-eGFP or HvGBSSIaCDC_Alamo-eGFP (two different lines: 12 and 5) in the cultivars CDC Alamo and CDC Candle. (J) Amylose content in starch isolated from dry mature grains of plants expressing either HvGBSSIaWT-eGFP or HvGBSSIaCDC_Alamo-eGFP in CDC Alamo or CDC Candle.