Abbreviations: Ci -intercellular CO2 concentration; E -transpiration rate; FM -fresh mass; Fv/Fm -maximum photochemical efficiency of PSII; gs -stomatal conductance; NPQ -nonphotochemical quenching; PN -net photosynthetic rate; SD -standard deviation; WUE -water-use efficiency; Y(II) -effective PSII quantum yield; Y(NO) -quantum yield of nonregulated energy dissipation; Y(NPQ)quantum yield of regulated energy dissipation; ФPSII -actual photochemical efficiency of PSII.