In most tree-breeding programs worldwide ... In addition, these transgenic trees have more numerous and longer xylem fibers than unmodified wild-type (wt) plants. Long fibers are desirable ...

Adam Vaughan/EPA-EFE Poplar trees next to Sefton Park Allotments in Liverpool cast long shadows in the evening sun. Mike Blake/Reuters Academy Awards host Conan O'Brien pushes the rolled red ...