Figure Captions
Figure 1 – Diurnal air temperature (T), photosynthetically active
radiation (Q), and relative humidity (RH) used for modellingAnet in all species. Dates indicate the
environmental conditions at the University of New Mexico in 2018. Grey
regions indicate night.
Figure 2 – Diurnal variation of apparent Vcmax(a, b, c) and Jmax (d, e, f) show consistent
declines by the end of day at 25 °C in Populus deltoides (a, d;N = 6), Capsicum annuum (b, e; N = 6), Malus
domestica (b, e; N = 6), Populus trichocarpa (b, e;N = 4) but not Pinus ponderosa (c, f; N = 3). At 30
°C there are diurnal declines in photosynthetic capacity inAsclepias speciosa (Jmax only; d; N= 6), Quercus muehlenbergii (a, d; N = 5), Rosa
grandiflora (b, e; N = 6), and Ginkgo biloba (c, f;N = 3) but not in Cedrus deodar (c, f; N = 4). Data
presented as means ± s.e.m.
Figure 3 – Apparent Jmax is strongly correlated
with apparent Vcmax across all species. Data
presented as means for each timepoint for each species; s.e.m. was not
included for clarity.
Figure 4 – Relative Vcmax (a-c) andJmax (d-f) for all species shown in Fig. 1. Data
presented as means ± s.e.m.
Figure 5 – Modelled diurnal Anet forAsclepias speciosa (a), Capsicum annuum (b), Malus
domestica (c), Quercus muehlenbergii (d), Populus
deltoides (e), Populus trichocarpa (f), Rosa grandiflora(g), Ginkgo biloba (h), Pinus ponderosa (i), andCedrus deodar (j) under conditions of constant maximumVcmax and Jmax (Peak), and
diurnally changing Vcmax andJmax (Changing), constant meanVcmax and Jmax (Average),
and constant minimum Vcmax andJmax .
Figure 6 – Apparent Vcmax (a),Jmax (b), and Anet (c) did
not decline significantly after 5 one-minute clamps on the same leaf
spot of individuals of Populus deltoides , Capsicum annuum ,
and Populus trichocarpa. N = 6, data presented as means ±
s.e.m.
Figure 7 – Modelled versus measured net CO2assimilation (Anet ) (a) and stomatal conductance
(gs ). Solid line indicates 1:1 relationship. See
text for statistics.