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Check out a copy of Plant Propagation: Principles
and Practices by Hartmann and Kester. This book has excellent information
on all types of propagation; rooting cuttings, seeds, grafting,
budding. I think it said most callus comes from the rootstock, but some
does come from the scion. However, T-buds are pretty much entirely
callused from the rootstock. As for scion dormancy I don't know. I
seem to have a harder time rooting (callusing) grapes when the buds have
already swollen.
Mark
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