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Identification of Photoperiod Insensitive Strains of Maize (Zea mays L.). II. Field Tests in the Tropics with Artificial Lights¹

Maize genotypes adapted to tropical regions were tested in the field for sensitivity to a change in photoperiod. Near the equator, with naturally equal light-dark periods, materials were evaluated by a technique which extended day length and created an intensity gradient with artificial light. Some genotypes, including one temperate-zone hybrid, were relatively insensitive to day length or intensity differences. Most genotypes showed a delay in floral differentiation, when grown in extended days with light intensities above one or two critical levels (5 and 1 to 2 fc, or 54 and 11 to 22 lux). The technique permits evaluation of numerous strains in the field, and has possible applications during the winter in higher latitudes.

Key Words: Photoperiod • Day length • Light sensitivity • Corn

² Maize Breeder, C.I.A.T. (formerly research assistant, Cornell Univ.); Maize Geneticist, I.C.A., Palmira; Chairman, Department of Crops and Soil Science, Michigan State University (formerly with C.I.A.T.); and Director, Colombian Maize Program, I.C.A., Medellin, Colombia. The assistance of Dr. C. O. Grogan was sincerely appreciated.

Received for publication January 16, 1970.

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