Major gene plus polygene inheritance analysis of curd sitting height in cauliflower
The"curd sitting height"is one of the important agronomic traits for evaluating the suitability of cauliflow-er varieties for mechanized harvesting.In order to analyze the genetic pattern of the"curd sitting height"trait in cau-liflower,the F7 inbred line of cauliflower(ZAASC4101,early-maturing and compact type)and the F6 inbred line of Chinese kale(ZAASJ1401)were used as parents to construct six combined populations including P1,P2,F1,F2,B1 and B2.The"curd sitting height"trait was anchored using two indicators:main stem height and leaf scar spac-ing.The results of this study showed that there was a significant correlation between the main stem height and the leaf scar spacing in the F2 population(the correlation coefficient was 0.652).And the two indicators were both continu-ous and approximately normal distribution,which was consistent with the characteristics of quantitative inheritance.The genetic analysis of the six-generation populations for the main stem height and the F2 population for the leaf scar spacing both showed that the optimal genetic model of"curd sitting height"trait in cauliflower was two pairs of addi-tive-dominance-epistatic major genes + additive-dominance-epistatic polygenes genetic model,indicating that this trait was mainly controlled by two pairs of major genes + multiple minor genes,and the heritability reached 97.84%.Therefore,it is possible to use the linkage molecular markers to assist selection and genetic improvement of the"curd sitting height"trait in cauliflower in early generations.In summary,the results of this study laid a prelimi-nary research foundation for further locating and exploring the key genes controlling the"curd sitting height"of cauli-flower,and ultimately using biotechnology to cultivate new varieties of cauliflower suitable for mechanized harvesting.
cauliflowercurd sitting heightsix-generation populationsmain gene plus polygene genetic analysisquantitative trait
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