Abstract
SUMMARYThe conditioning of Pinus radiata D. Don seedlings to withstand transplanting stress involves the use of a mechanical root undercutting technique. Using the Avena coleoptile bioassay the differences in hormone levels in acidic extracts of the shoots and roots of conditioned and control seedlings were determined. Conditioned seedlings had roots with higher relative growth rates and lower levels of inhibitors per unit of root weight than non‐conditioned seedlings.
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