Responses of Leaf and Tiller Emergence and Primordium Initiation in Wheat and Barley to Interchanged Photoperiod

The influence of constant (9, 13 and 19 h) and reciprocally-interchanged photoperiods [at terminal spikelet (TS) or triple mound (TM)] on leaf, tiller and primordium development were examined using photoperiod-responsive cultivars of spring wheat, ‘UQ 189’ and spring barley, ‘Arapiles’. In both species, constant longer photoperiod reduced the duration from sowing (S) to double ridge (DR), as expected. However, photoperiod sensitivity was not...