Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 12:369-373 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Imbibitional Chilling Injury in Zea mays L. Altered by Initial Kernel Moisture and Maternal Parent1

J. P. Cal and R. L. Obendorf2

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.

Key Words: Germination • Seedling vigor • Growth of corn • seed moisture

1 Contribution from the Department of Agronomy, New York State College of Agriculture, Cornell University, Ithaca, N.Y. 14850. Part of a thesis submitted by the senior author as partial fulfillment of the requirements for a Ph.D, degree. We gratefully acknowledge assistance from Dr. C. O. Grogan, Department of Plant Breeding and Biometry, for the contribution of seedstocks used in this study.

2 Graduate Research Assistant (Present address: Central Farm Research Station, British Honduras) and Associate Professor, Department of Agronomy, Cornell University, Ithaca, N.Y. 14850.

Received for publication November 27, 1971.


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