Scientia Agricultura Sinica ›› 2018, Vol. 51 ›› Issue (5): 964-976.doi: 10.3864/j.issn.0578-1752.2018.05.014

• HORTICULTURE • Previous Articles     Next Articles

Heterosis and Mixed Genetic Analysis of Green-Center Trait of Spray Cut Chrysanthemum

ZHAO QianRu, ZHONG XingHua, ZHANG Fei, FANG WeiMin, CHEN FaDi, TENG NianJun   

  1. College of Horticulture, Nanjing Agricultural University/Key Laboratory of Landscaping Agriculture, Ministry of Agriculture, Nanjing 210095
  • Received:2017-07-05 Online:2018-03-01 Published:2018-03-01

Abstract: 【Objective】 Green-center trait is an important ornamental trait of spray cut chrysanthemum, and the study of heterosis and genetic basis of green-center trait will provide an invaluable guidance for breeding program of spray cut chrysanthemum with green center. 【Method】In this study, inheritance and heterosis analyses were carried out for three green-center traits of spray cut chrysanthemum, i.e. the score of inflorescence center color (referred to as the inflorescence center color value, the same as below), the green-center relative area, and the period of inflorescence center keeping green, respectively. They were based on phenotypic data of 81 F1 population derived from yellow-center chrysanthemum cultivar ‘Nannongfengshou’ (female parent) and green-center chrysanthemum cultivar ‘Nannonghongxia’ (male parent), and 70 F1 population derived from green-center chrysanthemum cultivar ‘Nannonghongyun’ (female parent) and green-center chrysanthemum cultivar ‘Nannongxiaoqingxin’ (male parent) by using single generation segregation analysis method of major gene plus polygene mixed genetic model. 【Result】 The coefficient of variation of the two F1 hybrids was 24.88%-90.76%. The variation degree of Cross Combination I (yellow-center × green-center) was generally higher than that of Cross Combination II (green-center × green-center), but the average of Cross Combination II was generally better than that of Cross Combination I. In addition, the predominance of the inflorescence center color value, the green-center relative area, and the period of inflorescence center keeping green from Cross Combination I were -0.14, -3.42, and 0.11, respectively. The period of inflorescence center keeping green was positive, whereas other indicators of heterosis were negative. The predominance of the inflorescence center color value, the green-center relative area, and the period of inflorescence center keeping green from Cross Combination II were -0.11 -10.61 and -1.02, respectively. The over-parent heterosis of the period of inflorescence center keeping green was -0.52, which was worse than those of parents. There were positive and negative super-individuals in the two groups. The green inflorescence center color of F1 in Cross Combination I and Cross Combination II were 3.70% and 2.86%, respectively. The paternal flower color and the color which was one level lower than maternal flower color accounted for a similar proportion in the offspring and the proportion was more than 20.00%. The inflorescence center color value, the green-center relative area, and the period of inflorescence center keeping green were controlled by two pairs of major genes. The inflorescence center color value showed the negative effect, whereas the other two indicators showed positive effect. Furthermore, the inflorescence center color value, the green-center relative area, and the period of inflorescence center keeping green were 98.64%-98.83%, 95.04%-96.54%, and 66.73%-92.52%, respectively. Finally, there was a significant positive correlation among the inflorescence center color value, the green-center relative area, and the period of inflorescence center keeping green. 【Conclusion】 The heterosis and transgressive segregation of inflorescence traits commonly existed in F1 hybrid progenies of chrysanthemum, so we could choose individuals that were beneficial to the breeding. The genetic potential of the green inflorescence center color was weak, and we choose the cultivars as pollen donors in order to increase the numbers of green-center offspring. In addition, the heritabilities of the inflorescence center color value, the green-center relative area, and the period of inflorescence center keeping green were high, which was suitable for the selection in early generation. Finally, the positive correlation among the indicators was useful green-center chrysanthemum breeding.

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