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The Breeding of Poinsettia by Seedling
Ten common cultivars in Taiwan of poinsettia cvs. "Garden cultivar","Annette Hegg Dark Red","Gutbier V-14 Red"," Annette Hegg Diva Starlight","Eckespoint Lilo Red" , "Gross Supjibi"," Viner Star","Petoy" ,"Eckespoint Freedom", "PLA Jacobsen Peterstar" were pollinated by cross or self each other in order to discuss the reasons of low sterility and to select good seedlings by the way.Pollens germination was affected by temperature. Under the temperature of 15C , pollens did not germinate. The optimum temperature for most of germination of poinsettia pollen was at 23C. The successful pollination was also around 23C. Pollen tube entered ovule after the 3-5th day of a successful pollination.Not only had the highest pollen germination rate but seeds harvested of poinsettia cultivars occurred in "Garden cultivar","Eckespoint Freedom" and "Eckespoint Lilo Red". On the other hand the lowest of that occurred in "Annette Hegg Diva Starlight" and "Petoy". The worst for breeding was on "Jacobsen Peterstar" ,it had few pollens and the pollen did not germinate on style. Fruit setting rate was 2.3% and 136 seeds were obtained in the first year. Seeds germination rate was 26% (including two from aseptic seed culture) and 19 plants with good characteristics were selected. Fruit setting rate was only 18% and 812 seeds were harvested in the second year. The capsules and seeds appearance characteristics were more similar to female parent than male parent. For example "Eckespoint Freedom"×"Garden cultivar" the capsules and seeds of next generation were similar to "Eckespoint Freedom". There cross of red cv., "Garden cultivar" ×"Eckespoint Freedom", "Garden cultivar" ×"Cross Supjibi" or "Garden cultivar"×"Garden cultivar", offspring with red or white bracts. In the experiment,11 seedlings were selected from offsprings which were pollinated in winter and sow in May. Furthermore 8 seedlings were selected from offapring which were pollinated in spring and sow in July.
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