Acta Agriculturae Zhejiangensis ›› 2024, Vol. 36 ›› Issue (3): 527-533.DOI: 10.3969/j.issn.1004-1524.20230492

• Horticultural Science • Previous Articles     Next Articles

Major gene plus polygene inheritance analysis of curd sitting height in cauliflower

CAI Shiyi1(), YU Huifang2, WANG Jiansheng2, ZHU Biao1, SHEN Yusen2, GU Honghui2, SHENG Xiaoguang2,*()   

  1. 1. College of Horticulture Science, Zhejiang A&F University, Hangzhou 311300, China
    2. Institute of Vegetable, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2023-04-17 Online:2024-03-25 Published:2024-04-09

Abstract:

The “curd sitting height” is one of the important agronomic traits for evaluating the suitability of cauliflower varieties for mechanized harvesting. In order to analyze the genetic pattern of the “curd sitting height” trait in cauliflower, 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 spacing. 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 continuous 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 additive-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 preliminary research foundation for further locating and exploring the key genes controlling the “curd sitting height” of cauliflower, and ultimately using biotechnology to cultivate new varieties of cauliflower suitable for mechanized harvesting.

Key words: cauliflower, curd sitting height, six-generation populations, main gene plus polygene genetic analysis, quantitative trait

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