Abstract:

For selecting new Zinnia elegans F1 variety to prettify Beijing landscape, which has some characteristics, such as dwarf forms (height 20~40 cm), big flower (flower diameter 7~10 cm), good double petal, powerful stress resistance, robust development, uniformity and stability, the hybridization breeding research of Zinnia male sterile line was conducted by using the gathered source of Z. elegans species. After having done some field experiments, the factors of high temperature, high humidity and continuous rainfall in Beijing summer were also be considered, the sowing time of male parent and female parent was confirmed separately at the midmonth and latten-day of May in the second year, and before seedlings were planted for seedlings growing more robust, the base fertilizer kind and concentration need to be increased to resist adverse environment. Meanwhile, a potential cross combination was obtained, which had a red filial generation F1 deriving from the cross of red male sterile line and red self-bred line. By means of character contrast test between a red filial generation F1 and the other domestic and overseas F1 varieties, it showed good double petal, bright flower color, no colour fading, developing healthy and strong, preferable resist-stress, on the other hand there were some weakness, such as loose plant type and higher stem length，so the parent need to be improved and purified, especially the increase of stress resistance. Moreover, the pair of cross combination would be optimization in order to insure the stable and fine heredity ability in later years.