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.