The ‘end‐of‐day’ phytochrome control of internode elongation in mustard: kinetics, interaction with the previous fluence rate, and ecological implications
In the experiments reported here we monitored the extension growth of the first internode of light-grown mustard seedlings in darkness after pulses which provided different Pfr/p. The interactions between Pfr/P and the PAR levels at which the plants were grown, was also investigated as the latter had previously been shown to modify the extent of several responses to end-of-day pulses. Finally, we compared, over the same period of darkness, the efficacy of a reduction in Pfr/P at the end of continuous WL with that of similar reduction during continuous WL or several hours after the WL to dark transition