Publisher's Synopsis
Excerpt from Experimental Air-Layering of Shortleaf and Loblolly Pine
These experiments in air-layering shortleaf and loblolly pine show that the general branch method can be successfully applied to young trees. With older trees, this method shows much the same lack of success as the rooted cuttings method does; so reliance must still be placed on grafting for vegeta tively propagating older material. The much better results obtained with air-layering than with the rooting of severed cuttings can, of course, be attributed to the continuity of xylem tissue from parent tree to the treated branch. The benefit may be interpreted as an adequate source of water and nutrients, permitting uninterrupted transpiration and normal metabolism. Full sunlight can be utilized for maximum photosynthesis to provide high accumulations of food in tissue from which roots originate.
Further studies, with the air-layering technique used as a tool, will attempt to find out why we get roots from the xylem connected air-layered branch but few or none from the severed cutting. Eventually, it is hoped, techniques of rooting can be modified for successful use in forest genetics.
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