Studies On The Introduction And Crossbreeding Of Wild Primula L. From The Southwest Of China

There are about 500 species in genus Primula in the world, of which approximately 300 species distribute in China, and most of them are famous alpine perennials with beautiful flowers and can be cultivated as garden plants and pot flowers. A lot of perfect horticultural varieties have been relased abroad, and most of their central parents came from China. But up to now our precious germplasm resources are still leaved in wild without sufficient researches on the breeding and horticultural culture. Base on the work of 2001 research team, two investigation on the wild Primula. was made in Yunnan successively, and 13 species were introduced to Beijing. P. denticulata ssp.sinodenticulata, P. bulleyana, P. beesiana, and P. pulverulenta with high value of enjoy and distributed growing in relatively lower altitude were studied deeply In the recent three years our work mostly concentrated on 3 aspects: 1) study on the cultivation technology in greenhouse, the biological characters, and the photosynthesis characteristics; 2) research on the heat-resistant ability of the 4 species of Primula; 3) test of cross–breeding and the AFLP analysis on some species of Primula. The results are indicated as follows:1. The technology system was founded on P. denticulata ssp.sinodenticulata, P. bulleyana, P. beesiana, and P. pulverulenta including the propagation, environment control, prevention and cure of the plant diseases and insect pests. Under this technology system we can get perfect pot flower of Primula.2. The results of biological characters research showed that, the ecological adaptability of the four Primula species have high relativity with the anatomic structure of the leaves and the root system. There are no obvious differentiation of the spongy and palisade tissues, and the parenchyma cell are arranged loosely, this means that the high humidity of the soil and the atmosphere are needed by the Primula species. The different sizes of pollen and stigma papillae ulteriorly showed that the Primula species are Cross- pollination plants. The best temperature for seed germination is 20-25℃. Ranging between 0 and 500 mg/L, high concentration of GA is beneficial to germination, and light can also...