Call it genetic engineering for trees. That’s how ArborGen, a Summerville-based biotech company, serves the nation’s forest industry. Using gene transfer techniques, tissue-freezing cryogenics labs and a foresight that penetrates decades into the forest industry’s future needs, ArborGen develops ways to improve the quality of wood and the growth and harvesting of trees. Producing faster-growing trees is one of the byproducts of our research,” says Dawn Parks, ArborGen’s government and public affairs manager. ”We focus mainly on improving wood quality, tree plantation productivity and pulp and paper manufacturing.