Evolution of Brassica Crops( The U's Triangle) B nig n=8 b 展芥 Bcarinata B juncea n=17 n=18 bc b 埃塞俄比亚芥 芥菜型油菜 Boleracea B napus dampest n=9 n=19 n=10 ac 甘蓝 甘蓝型油菜 白菜型油菜 图1-1禹氏三角表明芸薹属基本种和 复合种的亲缘关系
Evolution of Brassica Crops( The U’s Triangle)
3. General characteristics of polyploid plants a) Giantness b)Low fertility c) More resistant to stresses Application of polyploidy in Plant Breeding 3x, 4x grape Big fruits, seedless 4x Tomato High vc content 3x watermelon Big fruit, seedless 3 x azalea杜鹃花 Big flower, long period of flowering
3. General characteristics of polyploid plants a) Giantness b) Low fertility c) More resistant to stresses 4. Application of Polyploidy in Plant Breeding • 3x, 4x grape Big fruits, seedless • 4x Tomato High Vc content • 3x watermelon Big fruit, seedless • 3x azalea 杜鹃花 Big flower, long period of flowering
§2 Polyploid Breeding多倍体育种 1. Selection of materials Agronomically superior Smaller chromosome number Capable of asexual fruit setting reat more varieties
§2 Polyploid Breeding 多倍体育种 1. Selection of Materials ▪ Agronomically superior ▪ Smaller Chromosome number ▪ Capable of asexual fruit setting ▪ Treat more varieties