Plant hormones coordinate monolignol biosynthesis with seasonal changes in Populus tomentosa

Temperate woody plants suffer environmental stresses caused by seasonal changes. Seasonal changes affect tree cambium activity, resulting in the annual periodicity of growth. In present study, we provide a model for plant hormone coordination monolignol biosynthesis to cope with poplar species. First, 27 core lignin-related genes were identified Populus tomentosa, and co-expression lignifying tissues was identified. Combining spatial expression analysis dynamic hormones found that poplars reorganized (cytokinin；3-indoleacetic acid, IAA; abscisic ABA) transport pathways winter-down pattern, decreases cytokinin, IAA, ABA content cells. The same pattern also involved precursors biosynthesis. specific pathway PtoCAD1, 2, 8, PtoCCR1, 7 PtoF5H2 showed contrasting winter-up patterns. We propose 1) hormones， such as regulate activity coordinate biosynthesis, especially components upstream this pathway, tomentosa; 2) inhibition hydroxycinnamoyl-CoA esters accumulation winter are responsible surviving cold materials fast growth during following spring.