Vernalisation and photoperiod responses of diverse wheat genotypes

Context Wheat (Triticum aestivum L.) adaptation is highly dependent on crop lifecycle duration, particularly the time at which flowering occurs in a specific environment. Frost, low solar radiation, heat and drought can significantly reduce yield if flowers too early or late. genotypes have different durations determined by plant responses to temperature (thermal accumulation vernalisation) photoperiod. These are largely controlled five phenology genes (two PPD1 three VRN1 genes). Advances modelling suggest that under field conditions could be accurately predicted with parameters derived from photoperiod vernalisation obtained environments. Aims This study quantified of 69 Australian wheat selected for diversity loci. Methods Spring winter were grown four environments constant 22°C (17 8 h) (0 weeks) treatments as factors. Key results Thermal coleoptile emergence spring was typically decreased more long than vernalisation; opposite true genotypes. sensitive contained allele Vrn-A1 locus. Conclusions There large phenological vernalisation, including among those matching multi-locus genotype. Implications Data this will used parameterise test model future study.