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Supplemental Text
Supplemental Text 1.
We used an experiment manipulating parental and offspring environment salinity levels
and neighbouring plant presence using 12 genotypes originating from non-saline and
saline environments in Tunisia to test the effects of soil origin, salinity exposure of
parents and offspring, and neighbours on vegetative traits and reproduction. Parental
environment did not significantly affect individual seed mass, nor did initial root length
differ for seedlings in either offspring environment or neighbour treatment. Seed mass
was not altered by PE (F(1,84) = 0.02, P = 0.9024) nor by the interaction between soil
origin and PE (F(1,84) = 0.69, P = 0.4082), though it was affected by history of selection as
seeds from non-saline-origin genotypes (4.96 mg ± 0.18 SE) were 17.4% heavier than
seeds from saline-origin genotypes (4.22 mg ± 0.11 SE; F(1, 84) = 12.19, P = 0.0008).
Soil origin differences in seed mass were however not correlated with differences in
initial root length between non-saline and saline-origin genotypes (Origin: (F(1, 78) = 0.09,
P = 0.7650, non-saline-origin: 4.66 mm ± 0.93 SE, saline-origin: 4.95 mm ± 0.32 SE).
Moreover, initial root length was not influenced by PE (F(1, 78) = 0.03, P = 0.8544), nor by
interactions between PE and soil origin (F(1, 78) = 0.27, P = 0.6076).
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