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Sweet corn with the  shrunken-2  ( sh2 ) gene is characterized by poor seed emergence and low seedling vigor. Also, this variety is sensitive to flooded conditions. Our objective was to determine the effects of aeration, during priming treatment, on germination and vigor. Priming consisted of aerating  sh2  maize seed during soaking then drying on a lab bench overnight under a fan. Fifty seeds at a time were soaked (25 ± 2C) in 100 ml deionized water. During this time they received either 75% O 2 : 25% N 2 , pure N 2 , pure CO 2 , or no gas (soak control) for up to 6 hours. The flow rates ranged from 0.35 to 2 standard liters per minute for 75% O 2 : 25% N 2 , 0.8 to 2.5 for N 2 , and 0.5 to 1.3 for CO 2 . Pressure was held constant at 1 psi. All samples were weighed before soaking, immediately after soaking, and again upon partial drying. Germination was counted after 7 days using the rolled paper towel method (25 ± 1C). Radicle lengths were measured after 72 hours. Oxygen (75%) increased vigor. Also, O 2  permitted greater water absorption ( P  &lt; 0.02). Carbon dioxide and N 2  both decreased vigor. Data suggest that aeration conditions (75% O 2 ) during the hydration treatment has beneficial effects.

EFFECTS OF GAS COMPOSITION DURING PRIMING OF sh2 MAIZE SEEDS