Correlation Studies of Slash Pine Tracheid Length
Abstract:Lengths of tracheids were measured on 3 increment cores at b.h. from each of 271 selected Pinus elliottii trees located in 15 geographic areas. Two random determinations were made on macerated summerwood portions from the combined 19th, 20th and 21st rings from the pith on each core. There were significant differences between cores within trees and between trees within geographic areas but no significant difference between geographic areas. Stepwise regression for each determination within each core with tracheid length as the dependent variable and 9 independent variables of site, growth and wood quality resulted in 6 similar prediction equations. For all 6 determinations, the only significant regression coefficients were for growth rate, specific gravity and site quality in that order. (Multiple correlation range: r = 0.33 to 0.44). A total stepwise regression of the means for each tree gave similar results. (Multiple correlation coefficient: r = 0.45). Various partial and simple correlations among the variables were discussed. Use of a tracheid length selection differential and knowledge of heritability obtained from other sources provides implications for tree breeding. Care must be used in selecting breeding trees with long tracheids because of its negative relationship with growth rate and specific gravity. A detailed procedure for the preparation of semi-permanent agar mounted tracheid slides is presented.
Document Type: Journal Article
Affiliations: Associate Professor, School of Forestry, University of Florida, Gainesville
Publication date: 1966-03-01
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