关键词: 杨树, 杂交, 育种, 策略

Abstract:

The resources of poplar tree in China were introduced briefly, and the achievements in poplar tree hybridization breeding of China were reviewed.The process of hybridization breeding in this tree species is divided into twoperiods.The problem of breed variety for poplar cultivation in north parts of China was solved during the first period.The current situation of planting poplar trees with the exotic clones directly in the regions from the south of the Yellow River to the middle and lower reaches of the Yangtze River was changed during the second period. However, there still exist the dangers of the potential breeding in the spreading of the clones with the close relatives because of the two period of breeding activities within a same generation, and lack of the procedure and method to be improved in hybridization breeding during euch a short period, always taking the species hybrid F₁ as the key of selecting clones, and the limitations of gene resources.The development of poplar breeding was stagnated as the plan was short of a combination of the long medium, and short period and the study on gene resources was not enough.Therefore, it was suggested that laying down the longterm plan based on the natural conditions of a region and the demand for species, strengthening the introduction of poplar tree resources from abroad, and tranfering breeding focal point from individual rapid growing to multiple characters and all directions will be the heart of the Chinese poplar breeding in the future.

Key words: Poplar, Hybridization, Breeding, Tactics