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Influence of Temperature and Photoperiod on Floral Initiation and Leaf Number in Sorghum 1
Author(s) -
Quinby J. R.,
Hesketh J. D.,
Voigt R. L.
Publication year - 1973
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1973.0011183x001300020028x
Subject(s) - phytotron , cultivar , biology , photoperiodism , sorghum , horticulture , agronomy , sorghum bicolor , botany
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.