Heterosis And Combining Ability Of11Radish Inbred Lines

Radish is one of the indispensable vegetable in our life. It can be eaten variety fresh, cooked, dried, salted or other ways. It has rich-nutrition, meat quality tight and crisp. Although China is one of the radish origin, and has abundant of germplasm resources, the current domestic market of radish seeds nearly is monopolized by Japan and South Korea, which radish have extremely resistant to bolting, beautiful shape and high yield traits.11radish inbred lines with high yield and extremely resistant to bolting traits had been selected from22radish inbred lines for years. According to the Griffing II (complete diallel cross), the experiment formulated55hybrid combinations, analysised heterosis of main traits, evaluated the combining combing ability and genetic effect of the parents and combinations. The aim is to provide a theoretical basis for radish breeding. The main results are as follows:1. The analysis of heterosis in the agronomic traits and quality traits:There are different levels of advantage trend between differen traits. Root weight, as the index of yield, the high-parent heterosis (HPH) reached96.4%. Plant height, plant width, root weight and root diameter had bigger advantage varies. In bolting traits,41%of combinations bolting time are between the two parents,40%of combinations bolting time are later than the latest bolting parents. In hollowness trait,45%of combinations are lower than the value of the parents. In quality traits, heterosis is relatively insignificant.2. The analysis of combining ability in main traits:A total of21agronomic traits had been mearsured,19traits were significantly variance, The traits of GCA variance and SGA variance of the traits had reached extremely significant level. P1, P2, P3, P5and P9are outstanding performance in the comprehensive traits. Different combinations in different traits on the SCA effect value were different significantly. There are28combinations are outstanding performance in the comprehensive traits.3. The analysis of genetic effect: Broad sense heritability of root weight, cellulose, carotenoid and chlorophyll (a+b) was significantly greater than narrow sense heritability. These traits were mianly for non-additive effects, and were relatively easily influenced by the environment In plant width, length leaf, width leaf, soluble solids and soluble protein of the broad heritability was similar to the narrow sense heritability values, and the effect is larger, due to the combined effects of additive effect and non-additive effect.