highly significantp < 0.001
bursa-pastoris and parental species was positive and highly significant for all three tissues ( p < 0.001), and the slope was intermediate between what would be expected if there were either only cis -( β = 1) or only trans -regulatory ( β = 0) changes ( β = 0.37, 0.42 and 0.46, respectively for flowers, leaves and roots).