The relationship between flowering time and daylength and temperature
is described for L. angustifolius using multiple linear regression. Th
e main cultivar was Gungurru but cvv. Danja, Yorrel and the L. albus c
v. Kiev Mutant were also studied. Regression analyses were performed o
n time to flowering observations for lupins grown with serial sowings
at up to 12 sites over up to 5 years in Western Australia (there were
102 separate observations of time to flowering for Gungurru). Time to
flowering in the L. angustifolius cultivars was best explained by a mo
del incorporating terms for average temperature and daylength between
sowing and flowering. Models of this form were not satisfactory for L.
albus, probably because of vernalization requirements which the L. an
gustifolius cultivars do not have. Using data from the experiment with
the widest range of sowings, 94.6% of the variation in time to flower
ing was explained by the above model and an additional 3.5% was explai
ned by including an interaction term. The rate of progress through all
stages of development to flowering, except for the period between app
earance of the last leaf and flowering, was sensitive to temperature.
The rate of leaf appearance responded to both temperature and daylengt
h and the rate of progress through the period between appearance of th
e last leaf and flowering was sensitive only to daylength.