Figure 8. The relationship between CO2 assimilation
(µmol CO2 m-2s-1)
and leaf δ13C isotope (‰) (P <0.01, r =
0.873); relationship between stomatal conductance (mol
H2O m-2s-1) and leaf
δ13C isotope (‰) (P <0.01, r = 0.807);
relationship between transpiration rate (mol H2O
m-2s-1) and leaf
δ13C isotope (‰) (P <0.05, r = 0.787) for
‘Honeycrisp‘ apple trees on B.9, M.9, G.969, CG.4292, G.210, G.87,
CG.5257, G.814, G.890 rootstocks. The lines indicate the adjusted linear
regression for the combined data points.