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© 1975 Oxford University Press

RESEARCH-ARTICLE

Root Initiation in Cuttings of Pinus radiata Seedlings

I. DEVELOPMENTAL SEQUENCE

DALE R. SMITH and TREVOR A. THORPE

Department of Biology, University of Calgary Calgary, Alberta T2N IN4, Canada

Adventitious root initiation in hypocotyls of Pinus radiata D. Don consists of three distinct phases. In the pre-initiative phase, following selection of the cuttings, no histological changes are observed. The initiative phase begins with swelling of a single parenchymatous cell, the meristematic locus. Distinct cytoplasmic changes within the meristematic locus are followed by cytoplasmic migration and asymmetric division in the surrounding cortical or peripheral cells. The third, or post-initiative, phase includes continued division of derivatives of the peripheral cells to form meristemoids which subsequently differentiate into root primordia.


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