Re: HYB: PBF history?

I aphylla was used by the French hybridizers very early in their program and came in via their plicata tetraploid introductions. Bob Schreiner wrote an article on aphylla inheritence in early tetraploids  way back when, can't find reference right now, documenting its history in the early black iris. I'm sure this brought PBF into the gene pool fairly early, as well as the many incursions with variagate. 

Many plants have developed PBF aparently as  protection against ultraviolet light. Thus many plants from higher altitudes have this characteristic. 
Some blue eyed grass clones have it and some other clones of the same species don't. 
In addition most plants have some beta-carotene in the foliage as a protector from sunburn. As does green tomatoes.

PBF in tetraploid bearded plants is a partial dominant, showing with three and four dosages of the genes, and showing occasionally with two dosages when climate conditions are correct.

Chuck Chapman

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