What are resin ducts in pine needles?

Resin ducts in pine needles are specialized channels that produce and transport resin, a sticky substance that serves various functions in the plant. These ducts help protect the tree from herbivores and pathogens, as the resin can deter insects and seal wounds. The presence of resin ducts is a characteristic feature of many conifers, aiding in their survival in harsh environments. Additionally, resin plays a role in water retention and can assist in the healing of damaged tissues.