Acta Horticulturae Sinica ›› 2022, Vol. 49 ›› Issue (8): 1723-1734.doi: 10.16420/j.issn.0513-353x.2021-0508

• Research Papers • Previous Articles     Next Articles

Quantitative Evaluation and Genetic Variation of Flower Opening Angles in Spray Cut Chrysanthemums

YANG Xiuwei, SU Jiangshuo, ZHANG Fei, GUAN Zhiyong, FANG Weimin, CHEN Fadi*()   

  1. State Key Laboratory of Crop Genetics and Germplasm Enhancement,Key Laboratory of Landscaping,Ministry of Agriculture and Rural Affairs,Key Laboratory of Biology of Ornamental Plants in East China,National Forestry and Grassland Administration,College of Horticulture,Nanjing Agricultural University,Nanjing 210095,China
  • Received:2022-05-28 Revised:2022-07-27 Online:2022-08-25 Published:2022-09-05
  • Contact: CHEN Fadi


In this study,based on 203 representative spray cut chrysanthemum(Chrysanthemum morifolium Ramat.)varieties,the flower opening angle of spray cut chrysanthemum was quantitatively measured by image processing at full-bloom stage and 11 flower opening angle related traits such as leaf petiole angle and inflorescence diameter were investigated. The results indicated that there was abundant variation in flower opening angle of spray cut chrysanthemums,and the coefficient of variation was 22.87%.‘Nannong Xiufengche’exhibited the smallest opening angle(62.12°),while‘Q1-79’had the largest opening angle(218.29°). The flower opening angle was significantly negatively correlated with the corolla tube length(-0.46),the corolla tube merged degree(-0.45)and ray floret length(-0.21), whereas it was significantly positively correlated with the number of ray florets whorls (0.39),ray floret width(0.35)and center disc flower diameter(0.31). The optimal regression equation for flower opening angle of spray cut chrysanthemum was obtained by multiple regression analysis: Y (flower opening angle)= 85.59 + 30.28X4(inflorescence diameter)-63.66X7(ray floret length)+ 21.78X8(ray floret width)+ 21.57X9(the corolla tube length)-62.31X10(the corolla tube merged degree) with a coefficient of determination larger than 0.69,which could be potentially used to predict flower opening angle of spray cut chrysanthemum. Principal component analysis integrated the investigated 12 traits into five principal component factors,including ray floral related traits,inflorescence size and leaf angle,etc,and the cumulative contribution rate was 89.07%. According to phenotypic clustering,the tested 203 spray cut chrysanthemum varieties were divided into four groups,displaying significant difference on flower opening angle.

Key words: spray cut chrysanthemum, flower opening angle, quantified estimate, regression analysis, cluster analysis

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