Table 2.

Duplicated HSP90 genes, selection pressure estimates, and the dating of gene duplication in olive tree

Gene 1	Gene 2	aKs	Ka	Ka/Ks	bDate (Mya)
OeHSP90-5	OeHSP90-11	0.291	0.027	0.093	80.833
OeHSP90-8	OeHSP90-4	0.490	0.039	0.080	136.111
OeHSP90-6	OeHSP90-3	0.009	0.002	0.222	2.5
OeHSP90-2	OeHSP90-1	0.362	0.011	0.030	100.556
OeHSP90-10	OeHSP90-12	0.330	0.022	0.067	91.667

^aKa and Ks were calculated using the program MEGA 5.05

^bThe divergence time was estimated according to formula: T = Ks/2λ. The clock like rate (λ) was 1.8 × 10⁻⁹ substitutions per site per year. Mya, million years ago