Photoperiod and Temperature Effects on Corn

Photoperiod Sensitivity in Tropical Maize Accessions, Early Inbreds, and Their Crosses

“…It is probable that materials developed in the more northern latitudes have been selected, naturally or artificially, to have little or no delay in tassel Initiation under the long photoperlods in which they normally grow (Hunter et al, 1974). Maize genotypes exhibit photoperiod responses in that they have different critical daylengths (Hunter et al, 1974;Major, 1980;Rood and Major, 1980). The presence of sensitivity within genotypes of specific maturities is revealed by observing reactions of plants in growing seasons differing strongly in photoperiod but little in temperature (Aitken, 1974).…”

Identification of quantitative trait loci associated with flowering, vegetative traits and photoperiod response in maize (Zea mays L)

“…FLN tended to be affected by temperature and daylength for strains with the most leaves . Other studies found little change in leaf number in response to temperature (Hunter et al, 1974;Aitken, 1977;. The response to temperature seems therefore cultivar-specific.…”

“…The delay in anthesis was primarily due to the delay in the transition of the apical meristem, which enables production of extra phytomers and also to the elongation of the additional intemodes produced (VlàduÇu et al, 1999). Genotypes insensitive to photoperiod have approximately the same FLN regardless of photoperiod (Hunter et al, 1974). Based on the apical meristem development, three phases of development have been defined: juvenile, inductive, and reproductive.…”

“…In long-day environments, this type of maize flowers when daylength begins to shorten (Francis et al, 1969). Materials developed in temperate areas might have been selected naturally or artificially to avoid or reduce the flowering delay in long-days (Hunter et al, 1974). The sensitivity to daylength has generally hindered the transfer of tropical maize to higher latitudes (Kaan and Derieux, 1986), and slowed the use of temperate maize in the tropics (Salamini, 1985).…”

Adaptation of Corn for Whole-Plant Silage in Canada

“…l-es besoins d'adaptation sont donc moindres pour la production d'ensilage que pour la production dJgrain. (Hunter et al 1974 Cell division can continue at a reduced rate during stress (Gardner and Nieman 1964) but cell enlargement is essentially stopped at very slight stress levels (Hsaio 1970). Kleinendorst (1975) growing degree days above 5oC, and corn heat units (Brown 1963 (Primault 1969) in which temperature, radiation, and precipitation are combined.…”