Breeding report on‘CPR1',a replanting-tolerant rootstock for peach

China is the biggest peach-producing country in the world. Replanting is practically inevitable in main producing area,especially in protected-cultivation area. Peach replanting leads to growth recession even tree death,which is turning into a problem.‘CPR1',as a new replanting-tolerant rootstock for peach,derived from Prunus davidiana × Prunus persica. Compared with P. davidiana and P. persica,‘CPR1',as the hybrid of the two species,show markedly heterosis with well-developed root system,stronger growth vigor and obvious replanting tolerance.‘CPR1'seedlings are relatively even and segregated limitedly with good graft-compatibility with peach and nectarine varieties. The forepart of new‘CPR1'shoot is green,the sunny side turning to amaranthine when the shoot getting older. The leaves of‘CPR1'are also amaranthine. The internode length is medium with the average value 2.14 cm. The flower is showy with elliptic petals. The internal surface of the corolla is greenish yellow. The anther is claret-colored with abundant pollens. The fruit is small,rounded-shaped and freestone with thin sarcocarp,no edible value.The surface of peach pit is smooth with many rills and a cuspidal apex. The single dry seed with stone averagely weighs 2.19 g.‘CPR1'begins sprouting in the middle of February and flowering in the middle of March in Zhengzhou area,Henan Province. The fruit matures in August. The average yield of seeds with stone in full fruiting period is 2 970 kg·hm2,approximately 945 000 seeds.‘CPR1'can be multiplied by seeds or propagated by cutting or micro-propagation.