
%0 Journal Article
%A King, RW 
%T Photoperiodic Time Measurement and Effects of Temperature on Flowering in <I>Chenopodium rubrum</I> L
%J Functional Plant Biology
%D 1979/06/01
%V 6
%N 3
%P 417-422
%K 
%R https://doi.org/10.1071/PP9790417
%U https://www.publish.csiro.au/paper/PP9790417 
%X The critical dark period length (c. 8 h darkness) required for induction of flowering of C. rubrum is insensitive to temperature (Q10 c. 1.0) over the temperature range 10-25&#176;C. However, the period of a rhythm controlling floral induction is shown to be temperature sensitive (Q10 c. 1.4) over the temperature range 9-22&#176;C. The discrepancy in temperature dependence of these two parameters of photoperiodic time-measurement could reflect differences in their rates of adjustment after a temperature shift. By contrast, at least two other species (Pharbitis nil and Hyoscyamus niger) show marked temperature sensitivity of their critical daylength. Thus, there may be more than one time- keeper in the photoperiodic control of flowering. 
