2.6 Statistical analyses of data
To estimate the effects of population (the corresponding early- and
late-season WR populations), population pair (CD, DC and HJ from
different collecting sites) and transplant season (the EARLY and LATE
rice-cultivation season) on plant growth and development during the
common garden experiments, two-way ANOVA (analysis of variance) was used
to determine the factors affecting the plant growth and development
significantly. Four groups of ANOVAs conducted: (1) estimation of the
effects of population and population pair in the EARLY rice-cultivation
season (Table 1), (2) estimation of the effects of population and
population pair in the LATE rice-cultivation season (Table S4), (3)
estimation of the effect of transplant season and population pair in the
early-season weedy rice populations (Table S5), and (4) estimation of
the effect of transplant season and population pair in the late-season
weedy rice populations (Table S6). The first two groups of ANOVAs aimed
to estimate the differences in growth and development traits, which were
measured in common garden experiments, between the early- and
late-season WR populations in the early and late rice-cultivation
environments, respectively. The later two groups of ANOVAs aimed to
estimate the differences in growth and development of the same
population in different rice-cultivation seasons.
In addition, differences included in this study were tested based on the
student t test (Blalock, 1972), and the method of two-tails and equal
variance test of two samples were adopted. Two-way ANOVAs and t test
were both performed using the software IBM SPSS Statistics ver. 22.0 for
Windows (SPSS Inc., IBM Company Chicago, IL, USA, 2010).