Photoperiod × temperature interactions in contrasting wheat genotypes: Time to heading and final leaf number

This paper describes the effects of photoperiod (9, 12, 15, 17, 19 and 21 h) and temperature (2117 and 1612°C maximum/minimum) on time to heading in wheat. Two spring wheats (a non-segregating awned selection of Sunset, and Condor), a semiwinter wheat (Rosella), and a winter wheat (Cappelle Desprez) were used. The last three genotypes respond to vernalisation and so were exposed to 4°C for 60 d before transfer to the photoperiod and temperature...