楸树不同无性系根段扦插初步研究

Study on the Root Cuttings of Different Clone of Catalpa bungei

以楸树不同无性系根段为材料,沙藏过冬后截段消毒进行扦插,研究楸树根段扦插出苗情况,比较不同无性系根段扦插苗生长差异。结果发现:楸树根段扦插整体出苗率高,不同无性系出苗率在77%~95%,扦插30 d后根段凸起大量白点,根段两头均有大量透明愈伤,45 d后开始出现萌芽,60 d后皮层及根下部愈伤产生大量根系。不同无性系盆栽扦插苗一年生苗高在61~81 cm之间,地径在9.29~12.12 mm之间,不同系号间差异达到显著水平(P<0.05)。总体来说,根段扦插出苗率高,简单易操作,推广应用前景广阔。不同系号间出苗率及生长存在显著差异,具有极大的选育潜力。

The root segments were used as the experimental materials, buried in the sand over the winter, and then cut after intercept and disinfection. Aiming to research the emergence situation of the root cuttings and compare their differences of the growth in different families. The result showed that there were a high germination rate with root cuttings, it was from 77% to 95% . It was germinated significantly after 30 days and appeared a large number of raised white spots on the root,there were a lot of callus at both ends of the root segment. The buds began to appear after 45 days, large root was appeared in the cortex and callus after 60 days. The annual height was from 61 cm to 81 cm and the annual ground diameter was from 9.29 mm to 12.12 mm in different families,there were both significant differences in these families. In general, there were a high emergence rate with root cuttings, it was easy to operate and had a broad application prospects. The emergence rate and growth had significant differences in different families, it had a great value in breeding.