Imbibitional Chilling Injury in Zea mays L. Altered by Initial Kernel Moisture and Maternal Parent1

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Abstract
The differential seedling growth of corn (Zea mays L.) hybrids after seeding at cold temperatures led to an evaluation of the effect of initial kernel moisture and parental lines on germination and seedling growth after cold imbibition. Low‐ and high‐moisture kernels were imbibed 0 to 21 days at 5C. Effects of cold during germination were evaluated by survival and growth of seedlings at 25C.Imbibition of low‐moisture (6%) kernels at 5C resulted in aborted radicles, proliferation of seminal roots, and delayed seedling growth. For certain inbreds and crosses, prolonged exposure to 5C resulted in reduced survival. Sensitivity to imbibitional chilling was partially or totally reversed when initial kernel moisture was 13 or 16%. Cornell M‐3 was sensitive to chilling while Pennsylvania 290 was relatively tolerant, but certain parental lines of both hybrids were sensitive. Sensitivity of reciprocal hybrids indicated maternal effects.

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