Experimental study investigation hybridization ...

The objective of this study was to investigate and evaluate possible breeding, propagating values of the isolated population of laurel leaf poplars in Zuunsaikhan mountain of Gobi-Altai. As being southernmost and only natural stand of P.laurifolia in Gobi region of Mongolia, this small population amidst of dry Gobi region presented the value of use in tree improvement programs for drought resistant poplar varieties. During our work it was observed that in Ulaanbaatar city, flowering began since 1 of May and seed dispersal on 14 of June, which equals 40 days after flowering. Also in one seedpod of P.suaveolens counted 28-32 seeds, while in branch culture it was 8-12 seeds per seedpod. Seeds germinated within 36 hours after it put on wet tissue paper. We used 2 different approaches to grow poplar seedlings first half were grown in ordinary seedbed ground of greenhouse, the other half were grown in containers. In greenhouse condition, containerized seedlings had slightly more growth than seedlings grown in open ground. Poplar growth was most intensive in July and August. Highest containerized seedling was 41 cm and highest bareroot seedling was 33.5 cm. Apecal growth stops by 15 August, foliage begins on 15 September and by 4 December seedlings completed winter bud dormancy. Pollen collection: Collected pollens were stored in glass tube until the artificial pollination whit-250C. Pollen grain of Laurel leaf poplar is of orange color, 24-32 mkm, round shaped. Pollen grains that not round shaped are dead pollen unable to fertilize the egg cell.