The Studies Of Germ Plasm Among Some Allium Lines And The Analysis Of Main Characters

The experiment was conducted in Shandong academy of agricultural science, using 38 cultivars collected by breeding office of vegetable graduate school of SAAS. We classified these welsh-onions and conducted analysis on main quantitative characters of these cultivars. The study establishes the theoretic foundation for the class and the breed of the welsh-onion. Results indicated: 1.The study observed and stated 11characters on 23 straight welsh-onion cultivars coming from different areas. The welsh-onion cultivars can be divided into four groups: long-thick type,long-thin type,short-thick type and short-thin type. The leaf width and the stalk index character which divide these four groups are selected from step discrimination. The estimate functions are: long-thin type :z1=-747.5+274.7x6+31x9 short-thin type: z2=-538.2+238.3x6+25.6x9 short-thick: z3=-687.5+278.5x6+27.3x9 long-thick type:z4=-710.5+278.1x6+28.7x9 The percent of right is 91.3%, so the estimate function is effective. 2. The study observed and stated 10 agronomic characters on 21 straight welsh-onion cultivars and 38 groups. Correlation analysis,path analysis,,main component analysis and regress analysis are carried out. The results are that: stem length, stalk length, stalk width, leaf length, leaf width, leaf numbers, distance of the adjacent leafs are related to the yield of plant positively; stalk length, stalk width, leaf width, leaf numbers are important factors for the yield of the plant. Principal component â… contained 55.55 percent of total genetic information, we considered principal component â… as welsh-onion length factor. Principal component â…¡contained 21.28 percent of total genetic information, we considered principal component â…¡as welsh-onion width factor. Principal component â…¢contained 9.37 percent of total genetic information, we considered principal component â…¢as welsh-onion photosynthesis factor. By using factor load of main characters within each component and correlation coefficients of different characters with aim character we can decide selection direction and select out materials which can meet breeding aims. 3. 38 welsh-onion cultivars were analysed by RAPD markers. Four 10 bp...