$C_{C{O}_2}$	Carbon dioxide concentration $(mL L^{-1})$
DLI	Daily light integral $(mol m^{-2} da{y}^{-1})$
F	Intensity ratio corresponding to specific wavelengths in the form of $(\frac{PF{D}_{specific}}{PF{D}_{overall}})$ or $(\frac{I_{specific}}{I_{overall}})$
f	Mass rate of change $(g m^{-2} s^{-1})$
g	Conductance $(m s^{-1})$
I	Spectral irradiance integrated over wavelengths $(W m^{-2})$
PFD	Photon flux density $(\mu mol m^{-2} s^{-1})$
$R_I$	Ratio of spectral irradiance integrated over PAR+FR wavebands to a spectral irradiance reference value (R180 is considered as the reference) $(\frac{I_{PAR+FR}}{I_{PAR+FR,R180}})$
$r_{gr}$	Growth rate of structural material $(g m^{-2} s^{-1})$
SPFD	Spectral photon flux density $(\mu mol m^{-2} s^{-1} n{m}^{-1})$
T	Temperature $({}^{\circ }C)$
X	Dry Mass $(g m^{-2})$
Subscripts:
B	Blue light waveband $(400-500 nm)$
bnd	Boundary layer
car	Carboxylation
FR	Far-red light waveband $(700-750 nm)$
G	Green light waveband $(500-600 nm)$
K	Extinction coefficient
lar	Leaf area ratio
max	Saturation rate $(g m^{-2} s^{-1})$
nsdm	Non-structural dry mass $(g m^{-2})$
PAR	Photosynthetically active radiation $(400-700 nm)$
PPFD	Photosynthetic photon flux density $(\mu mol m^{-2} s^{-1})$
phot	Carbon dioxide photosynthesis (gm–2 s–1)
Q 10	Q 10 factor
R	Red light waveband (600 – 700 nm)
resp	Maintenance respiration (gm–2 s–1)
rt	Root
sdm	Structural dry mass (g m–2)
sht	Shoot
stm	Stomata
Greek Letters:
$\alpha$	Conversion of assimilated CO2
$\beta$	Yield factor
$\gamma$	Growth rate coefficient
$\text{Γ}$	CO2 compensation point (ml L–1)
$\epsilon$	Light-use efficiency $(g J^{-1})$
$\tau$	Ratio of root dry mass to total dry mass
$\omega$	Density of CO ${}_2$ $(g m^{-3})$