1. The adventive buds on the root-tuber of
Ipomoea Batatas are developed around the scars of the damaged lateral roots. They develop mostly after the root-tuber was harvested, but rarely while the root-tuber is still in the soil. In the latter case the development is related with the damage of the lateral roots or of the root-tuber itself.
2. The initial cells of the adventive buds are derived from the parenchymatous cells of the phelloderm of the root-tuber which were activated by the wound stimulus, probably the wound hormone and auxin. The initial cells project into the intercellular space where they develop as the primordium of the adventive bud. The roll of the humidity on the bud or root formation is to be studied from several standpoints, but I can say here that the wet condition suppresses the formation of the bud primordium while it promotes the development of the root primordium. The airy condition in the intercellular space underneath the cork layer supports the development of the bud primordium while it suppresses the development of the root primordium.
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