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Abstract Transgenic poplar (Populus tremula x Populus alba) with antisense CCoAOMT was planted in field for four years. The Klason lignin content evaluation showed that the transgenic tree had decreased lignin content by about 13% comparing to the wild control, which means that the decrement of lignin content was maintained in 4-year-old transgenic poplar. The lignin structure analyses by Thioacidolysis and GC displayed that G/S ratio in transgenic poplar was slightly decreased comparing to control. Histology examination of stem section showed that most of vessels in transgenic tree were regular similar to that in wild control, but some vessels transgenic tree were deformed with inward sunk walls. There were no difference in plant height and stem diameter between transgenic trees and wild control during four years of growing.
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Received: 22 October 2007
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