关键词: 刺槐, 刺槐, EST-SSR, PCR反应体系

Abstract: In order to compare the rooting of different clones and under different factors, a study on rootability of 17 superior clones of Populus deltoides hybrid offspring and 2 contrast varieties was done based on comparing their differences in different cutting parts, different substrates and different clones, and analyzed the data of rooting rate, root length and the number of fibrous roots. The results showed that the root of the clones grew faster in water culture, but the quality was poorer than that of the clones in the wet sand and perlite matrix. Roots were about 7 cm long in the water culture, and were about 5 cm long in the wet sand, the number of taproots of base cuttings in the wet sand was twice as many as that in the water culture. Because of the genetic differences, there were significant differences in rooting, the rooting ability of those superior clones was significantly higher than that of the control NL895 and 2025, and the root length and the taproots number of I-1000, which was the best one, were 9.48 cm and 15.31 respectively, almost three times over that of the control NL895. The number and the length of roots would reduce significantly when the cuttings were pulled out from the substrate repeatedly. The rooting quality of base cuttings was significantly better than that of the middle cuttings. To cultivate and popularize new fine varieties should depend on choosing suitable cutting substrate and base cuttings with strong rootablility and high-quality.