Abbreviation	Parameter (units)
A	Net photosynthetic rate (mmol CO2 m−2 s−1)
AL	Leaf area (m2)
AR	Root area (m2)
ACR	Mean cross-sectional area of the trunk (cm2)
dL	Xylem lumen diameter (mm)
E	Leaf transpiration rate (mmol H2O m−2 s−1)
Ec	Canopy transpiration rate (mmol H2O vine−1 s−1)
Ea	Ambient vapour pressure (kPa)
Es	Saturation vapour pressure (kPa)
Kc	Crop coefficient
gs	Stomatal conductance to water vapour (mmol m−2 s−1)
gmax	Maximum stomatal conductance to water vapour (mmol m−2 s−1)
kR	Root hydraulic conductance (kg MPa−1 s−1)
kL	Leaf specific root hydraulic conductance (kg MPa−1 s−1 m−2)
Kr	Hydraulic conductivity of excised root segments (kg m MPa−1 s−1)
L0	Most common vessel length (m)
Lm	Maximum vessel length (m)
NV	Number of vessels per cross-sectional area of root xylem (no. mm−2)
NR	Number of first order roots (no. trunk−1)
Nsfv	Number of silicon filled vessels per root cross-section
Px	Frequency distribution of vessels in specific length classes (%)
Td	Roostock trunk diameter (mm)
Tleaf	Leaf temperature (°C)
Ψcrit	Stem water potential at which xylem cavitation ensues (MPa)
ΨLmin	Leaf water potential at which stomata begin to close (MPa)
ΨPD	Pre-dawn leaf water potential (MPa)
ΨL	Midday leaf water potential (MPa)
VPD	Air vapour pressure deficit (kPa).
VPDleaf	Leaf to air vapour pressure deficit (kPa)