Fig. 6From: Seasonal variations of auxin and gibberellin A4 levels in cambial-region tissues of three conifers (Pinus elliottii, Chamaecyparis obtusa, and Cryptomeria japonica) with inherently different wood densitiesRelationships between IAA levels and tracheid formation in three conifers during early season. Sugi and hinoki data were from samples collected the following April. The plotted data represent the IAA levels in the following April and the number of tracheids formed in test period VBack to article page