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Principal component analysis between treatment and variable interaction. Comp.1, total chlorophyll content; Comp.2, net photosynthetic rate (PN); Comp.3, stomatal conductance (gs); Comp.4, transpiration rate (Tr); Comp.5, Fe concentration; Comp.6, nitrite reductase (NIR) activity; Comp.7, succinate dehydrogenase (SDH) activity; Comp.8, aconitase (ACO) activity.
