Relationship of wood structure to compartmentalization of discoloured wood in hybrid poplar

Abstract

Xylem in hybrid poplar trees (Populusdeltoides Marsh × P. trichocarpa Hook) that had small columns of discolored wood associated with wounds (strong compartmentalization) was different from xylem in trees that had large columns (weak compartmentalization). Vessel systemshad the most obvious differences. Strong-compartmentalizing trees had fewer and smaller vessels with fewer connections to other vessels than the weak-compartmentalizing trees. These anatomical differences may aid in selecting, at an early age, strong-compartmentalizing trees resistant to defects.