Gene Effects Analysis Of Specially-long Pod Length In Resynthesized Brassica Napus

Six genetic populations (P₁, P₂, F₁, F₂, B₁, B₂) of two hybrid combinations of Brassica napus L. H218×Zhongyou 821, H218×MSP334 were used to study the gene effect and the genetic model of related traits of 3 silique, namely the full pod length, the pod body length and the pod beak length. The correlation of the seeds number per pod and the length pod were also analyzed. The major results were as follows:1. The variance analysis indicated that the full pod length, the pod body length and the pod beak length had highly significant difference in every generation of two combinations, but there was no significant difference in the repetitions. It was showed that the genetic structure in different generation population is different.2. There were significant differences in average values of the three traits- the full pod length, the pod body length and the pod beak length between six generations. The order of the average values in the three traits was P₁>B₁>F₁>F₂>B₂>P₂. It was shown that the higher the value of parents genetic component was in the offspring, the higher the value of it was in pod lengths.3. Correlation analysis with F₂ population of the two combinations showed that the full pod length was highly significantly correlated to the pod body length, the pod beak length. and the seeds number per pod. The results indicated that the long pod character was of great significance in rapeseed breeding.4. The three traits frequency of F₂ population in the two combinations had a continuous normal distribution, indicating that these traits were quantitative traits controlled by polygene.5. The preliminary study of gene effect analysis and genetic model by generation average method showed that the three traits in combination H218×MSP334 and the pod beak length in combination H218×Zhongyou 821 fit the additive-dominant-epistatic model. [d]+[i]>[h]+ [l]of in the three traits showed that over-high parent were difficult to obtain for the three traits in F₁, and [d] + [h]>[i] + [j] + [1] showed that additive...