Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 13:243-246 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Influence of Temperature and Photoperiod on Floral Initiation and Leaf Number in Sorghum1

J. R. Quinby, J. D. Hesketh and R. L. Voigt2

Twelve sorghum [Sorghum bicolor (L.) Moench] cultivars were grown in the field at two elevations in Arizona and in two day lengths and five temperature regimes in phytotron greenhouses in an effort to obtain a better understanding of the influence of photoperiod and temperature on time of floral initiation and leaf number in sorghum.

Maturity genotypes were known for seven of the cultivars tested. Alleles at all four maturity loci responded differently to temperature. All cultivars responded to differences in temperature differently in the two photoperiods, indicating interaction between temperature and photoperiod.

Regardless of length of photoperiod, most cultivars produced more leaves in the warmer night temperature regime of 32/29 C than in the 32/23 C regime, but leaf numbers also tended to be high in the cold 17/11 C regime. Plastochrons varied among cultivars.

Key Words: Maturity genes • Plastochrons • Degree-day concept

1 Contribution from Pioneer Hi-Bred Company, Plainview, Texas; the Southern Region, Agricultural Research Service, USDA in cooperation with the Mississippi Agricultural and Forestry Experiment Station (Journal Paper No. 2417); and the Arizona Agricultural Experiment Station (Journal Paper 1962).

2 Consultant, Pioneer Hi-Bred Company; Research Soil Scientist, USDA, Department of Biological and Agricultural Engineering, North Carolina State University, Raleigh 27607, formerly Agronomy Department, Mississippi State University, State College; and Professor, Department of Agronomy and Plant Genetics, The University of Arizona, Tucson 85721, respectively.

Received for publication August 17, 1972.




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