Complex traits such as flowering and seed production are modulated by genotype x environment interactions and the mechanistic basis of these interactions is still lacking. In this proposal, we seek to identify and tag genes that modulate the flowering time in sorghum in response to complex environmental interactions and elicidate the mechanistic basis of this response exploiting model system genetics. These studies will immensely contribute to the mechanistic realization of genotype x photoperiod x temperature interactions, in addition to leading to the production of novel sorghum varieties with desirable characteristics.