Re: TB, "I" gene
As the breeder of Age of Innocence, a white with a blue edge around the falls, I am confident that the "I" inhibitor is not responsible for this pattern, which is usually called the Emma Cook pattern (EC)after one of the first TBs showing this pattern. What does seem responsible for the pattern is four doses of the dominant amoena gene. EC pattern X EC pattern gives all EC patterns. EC X blue self gives amoenas. EC X amoena can give both ECs and amoenas if the amoena parent carries at least two dominant amoena genes. If the amoena parent carries only one amoena gene the offspring will all be amoenas. The following are EC patterns from my breeding lines: Christiana Baker, Victoria Circle, Queen's Circle, Sappphire Halo (2003). It is also possible to have the pattern on a yellow, orange or pink background with the edge color altered to red to brown shades:
Added Color, Bold Vision, Dear Jean, Kiss of Kisses, Lena Baker are from my lines. A cross of Gypsy Woman, an EC pattern, with Silverado resulted in Ivory Goddess which is neither an EC nor an amoena, because the sap pigment was suppressed by "I" from the Silverado parent.
I doubt the "I" gene has anything to do with pigment distribution on the petal, only with the intensity of the blue pigment.
Fred Kerr
Rainbow Acres
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