Research on Grafting Breeding of Wild Prunus campanulata
To improve the reproductive coefficient of Prunus campanulata and better protect and utilize the wild germplasm resources of P.campanulata,the effects of grafting time,grafting method,and rootstock size on the grafting survival rate and growth of grafted seedlings were studied by using P.campanulata seedlings as rootstocks and wild P.campanulata superior plants as scions.The results showed the most suitable grafting time was mid-January in Meizhou,Guangdong,and the grafting survival rate was 93.33%,which was significantly higher than other grafting times(P<0.05).The grafting method significantly affected the grafting survival rate as well as the seedling height and ground diameter of grafted seedlings(P<0.05).The survival rate of grafting by cutting or side-scion grafting was higher,reaching 91.33% and 93.33%,respectively,which was better than 73.15% and 82.67% of split grafting and bud grafting.The grafting seedlings of the cut grafting method or the side-scion grafting method showed better growth performance,with an average seedling height of 166.27 cm and 170.05 cm,and an average ground diameter of 18.38 mm and 18.04 mm,respectively.The growth performance of grafted seedlings with embedded buds is the worst,with a seedling height of only 118.56 cm and a ground diameter of only 13.76 mm.The diameter of the rootstock had a significant effect on the grafting sur-vival rate and the growth of grafted seedlings of P.campanulata(P<0.05).The survival rate of rootstocks with a ground diameter>1.0 cm was significantly higher than that of rootstocks with a ground diameter<1.0 cm.The correlation analysis showed that rootstock diameter had a highly significant positive correlation with grafted seedling height and diameter.The larger the ground diameter of the rootstock,the better the growth of the height and ground diameter of the grafted seedlings.It is suggested that the 1-year-old seedlings with ground diameter>1.0 cm should be selected as rootstocks in production.
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