Selection Of Superior Individual And Genetic Analysis Of The Main Characters In Radish

Two radishes with different characters were crossed for F1, and then self crossedfor F2segregating population. The study was carried out with this F2segregatingpopulation. The major economic characters and quality traits were measured to selectsuperior individual plants for the next breeding. The genetic modes of maincharacteristics were also discussed in order to provide the foundation for genetics andbreeding in radish. The main results were as followed.1. Four superior plants were selected according to overall selection method, whichwere F2-48, F2-46, F2-38and F2-29.2. Correlation analysis showed that the yield was highly correlated to the leaflength, leaf width, root length, root width, the correlation coefficient were0.474,0.478,0.550,0.576and0.920, respectively. Meanwhile the yield was also significantcorrelated to the plant height and width, the correlation coefficient were0.337and0.390, respectively. The results suggested that the yield of radish was correlated to theplant growth, usually the better growth the higher yield.3. Path analysis showed that the path coefficient of root width to the yield was0.7826, which indicated that root width was the most important factor to improve theyield and the root width should be the major character for high yield breeding in radish.The path coefficient of root length to the yield was0.2892, which showed that rootlength had significant effect on the yield. The path coefficient of leaf width was0.1463,so it was useful on the yield. The path coefficient of leaf number is0.0027, which hadlittle effect on yield, and then the selection criteria of leaf number could be relax. Thepath coefficient of leaf length and plant height is-0.1006and-0.01, show that it hasnegative effect on the yield, so it not suitable to select those with longer leaf and highindividuals. 4. Using the method of major gene plus polygene single inheritance model inquantitative traits of plants, the genetic model of some characters were analyzed. Itwas concluded that the optimal model of Vc content and root length was one additive-dominant major genes model, and the heritability of major genes were57.72%and95.58%. The optimal model of yield and total soluble sugar content was two additive-dominant-epistasis major genes model, and the heritability of major genes were95.71%and92.55%. The optimal model of soluble protein content of root and solublesolid state material content was one additive major genes model, and the heritability ofmajor genes were59.53%and50.30%. The optimal model of soluble protein contentof leaf was one negative dominant model, and the heritability of major genes were92.62%. The leaf width, plant height and chlorophyll content characters werequantitative characters, which were controlled by minorgene.