Introduction
Forest trees have wide range of commercial uses including timber, paper and pulp production and as an energy source.
Limits of forest- tree breeding
1)Long generation time.
2)Limited knowledge of genetic mapsof most forest trees.
3)Identification and control of suitable parents.
4)Size and area required for field trials.
Genetic Transformation of forest trees
Most common tools used are Agrobacterium and particle acceleration.
Targets for forest- tree engineering
1)Modifying lignin content and composition
-CAD (cinnamyl alcohol dehydrogenase)
2)Altering tree form, quality and performance
-rolC gene and rolABC gene fragment
3)Herbicide resistance
-aroA gene
4)Insect resistance
-Bt toxin or insect-digestive-system-inhibitor genes
5)Restricting gene flow and early flowering
6)Phytoremediation
