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Crop Science Abstract -

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


This article in CS

  1. Vol. 10 No. 5, p. 465-468
    Received: Jan 16, 1970

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  1. C. A. Francis,
  2. D. Sarria V.,
  3. D. D. Harpstead and
  4. C. Cassalett D.2



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.

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