Vol. 32

Title:
THE ROOTING STIMULUS IN PINE CUTTINGS

Author:
Bruce E. Haissig

pp: 625-638

Abstract:
Occurrence, distribution, and function of the "endogenous root-forming stimulus" (ERS) were examined in jack pine (Pinus banksiana Lamb.) seedling cuttings via surgical treatment and application of indole-3-butyric acid (IBA). Removal of terminals or needles markedly reduced rooting, indicating that both terminals and needles contained substantial amounts of ERS and that ERS was rather generally distributed in the cuttings. However, terminals contained much more ERS per unit dry weight, compared to needles. ERS consisted of an auxin and non-auxin component. Applied IBA did not replace the effects of terminals on rooting and, therefore, was largely ineffective when non-auxin ERS was limiting. Auxin ERS was initially required for the development of callus in which primordia initiated. Subsequently, auxin and non-auxin ERS were required for primordium development. However, limiting the supply of non-auxin ERS was primarily responsible for reduced rooting after terminals were removed.

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