Leaf dimension growing process is driven by a plant elongation rate is PER (cm d-1). PER depends on thermal time and it is influenced by water stress (Inman-Bamber, 1991; Inman-Bamber, 1994b):

where SWDF2 is the stress factor for expansive growth (see Abiotic stresses section), dPERdT is a ecotype parameter representing the unstressed plant extension rate (mm°C h-1), Tmean is mean daily temperature, and TBASEPER is an ecotype parameter for plant extension base temperature (°C).

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