Abstract:

Combined chromosome doubling with interspecific crossing and pollen, seeds radiation, a number of artificial allotriploids of Populus tomentosa were bred firstly in the Institute of Populus tomentosa of Beijing Forestry University, China. The best one of allotriploids (clone B301) shows great increment of wood volume in 3m×3m spacing for 8 years old stands. Wood production of B301 obtains 399m³/hm² approximiatly 50 m³/hm² per year, as high as 3 times of the control, shows growth rapidly. But among the different clones of allotriploids their rates of growth are different, it shows the selection is a very important tool necessary not only for using in diploid tree population but also in triploid stands. The new achievements indicate that so far China has had already her own triploids of white poplars and used them in wood production.

Key words: Populus tomentosa, Triploid, Unreduced 2n pollen, Allotriploid