Shoot Culture And Somatic Embryogenesis In Aspen Clones

In this paper, a three-step micropropagation was successfully employed for 8 selected genotypes of aspen. At the same time, through the induction of embryogenic callus, Somatic embryogenesis was studied. It would be beneficial to establish a stable system of embryogenesis in poplar.The results of study on aspen shoot culture using node as explant show that percent bud regeneration of AG (Populus alba×P. grandidentata) and 3# (P. tremuloides×P. tre-mula) was lower than that of the other clones. Percentage of bud regeneration could be improved at vertical cutting. With the increasing of zeatin concentration, in vitro organogenesis was different. All clones were easy to induce rooting, especially AG and Ca, and number of roots was fit to estimate the effect on rooting of plantlet.Supplemented with l0mg/L 2,4-D, suspension cultures initiated from callus derived from petiole of aspen hybrid 3# produced embryogenic callus and a highest number of globular-shaped embryos, and cotyledonary-stage embryos originated from white callus of grey aspen Ca(P. ×canescens) shoot were first observed and embling were obtained. Genotypes and concentration of 2,4-D was critical to induce embryogenic and somatic embryogenesis. Morphogenesis of shoot was affected by culture temperature. Characteristic of callus produced embryogenic cell was heterogeneous, but potential ability to produce embryogenic cell was different.