The influence of daylength on final leaf number in spring wheat

The influence of daylength on final leaf number was determined in four field-sown wheat cultivars with no vernalisation requirement. Leaf and primordium appearance was monitored in plots sown at two-month intervals during an annual cycle. The timing of the response to daylength varied substantially among cultivars. In one, final commitment of the last leaf primordium occurred close to the time of initiation of that primordium while, in another...