Fig. 6. Standard, accelerated aging, and cold test germination for seed lots of hybrids D (sugary endosperm, SU; dotted regression line) and E (starchy endosperm, ST; dashed regression line) harvested at different developmental stages in 1999 and 2000 that were either unfrozen (solid symbols) or exposed to –6°C for 7 h (open symbols). The 95% confidence interval around regression lines can be used to compare differences among years.