Many of these works had mature wood in focus. However, as recently reported by Li et al.
(2017) in Larix kaempferi (Lamb.) Carr., wood transcriptome varies along the life of the tree, so transcripts related to juvenile wood formation could have been missed in those studies.

【Transcriptomic analysis of juvenile wood formation during the growing season in Pinus
canariensis，Holzforschung 2017; 71(12): 919–937】

Wan-Feng Li^(*)，Wen-Hua Yang，Shou-Gong Zhang，Su-Ying Han，Li-Wang Qi^(*)，Transcriptome analysis provides insights into wood formation during larch tree aging，Tree Genetics & Genomes，2017.1.20，13（1）：19