Redistribution of 14C-Labeled Reserve Food in Young Red Pines During Shoot Elongation
To study the role of food reserves in shoot elongation, we fed 14CO2 photosynthetically to 1- and 2-year-old needles of young red pines late in the growing season and measured dry weight of plant parts and redistribution of 14C during the next season's elongation growth. We also measured CO2 exchange during initial elongation growth. No massive movement of 14C from either age class of needles into structural tissue of the developing shoot occurred under our conditions. However, 1-year-old needles appeared to be largely responsible for the initiation and maintenance of shoot elongation, and probably contributed in three ways: (1) by translocation of current photosynthate to the bud during the prior growing season, (2) by mobilization of reserves to meet immediate post-dormancy respiratory demands, and (3) by the provision of current photosynthate shortly after the beginning of bud extension. The relative importance of the three is probably heavily dependent on environmental conditions. Forest Sci. 16:14-20.
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Document Type: Journal Article
Affiliations: Plant Physiologists, North Central Forest Exp. Sta., Forest Service, U.S.D.A., Rhinelander, Wisconsin
Publication date: 1970-03-01
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