2.4.1 Growth and physiological traits
General linear models (GLMs) were used to assess the effects of seed source of region, soil moisture treatment and their interaction on growth traits (the number of tillers, plant height, aboveground biomass and belowground biomass) and physiological traits (Pn, Tr and Gs) in SPSS version 27.0 (IBM, USA). When the main factor effect (seed source of region, soil moisture treatment) is significant on a trait, the difference significance of the trait mean values among the main factor treatments was analyzed by Duncan’s multiple comparison. When the seed source of region × soil moisture treatment interactive effect is significant on a trait, pairwise comparisons of different levels of one factor for fixed levels of the other factors (sometimes called simple main effects) were analyzed by Duncan’s multiple comparison.