JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (3): 117-126.doi: 10.12302/j.issn.1000-2006.202103038

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Phenotypic diversity of 21 Hibiscus cultivars

CHEN Han(), WANG Dongsheng, BAI Bing, LI Jiafeng, CHEN Kexin, CHENG Beibei*()   

  1. College of Horticulture Science and Technology, Hebei Key Laboratory of Horticultural Germplasm Excavation and Innovative Utilization,Hebei Normal University of Science and Technology, Qinhuangdao 066600, China
  • Received:2021-03-23 Accepted:2021-07-29 Online:2022-05-30 Published:2022-06-10
  • Contact: CHENG Beibei E-mail:1243553200@qq.com;beibei87613@126.com

Abstract:

【Objective】 This study focuses on the phenotypic diversity of germplasm resources and the upgrading of existing cultivars of Hibiscus syriacus, to provide theoretical support for developing new varieties. 【Method】 Through cluster analysis, correlation analysis and diversity analysis, ten quantitative characters and 24 quality characters were analyzed for 21 Hibiscus cultivars. 【Result】 Hibiscus cultivar resources have rich phenotypic diversity. The diversity index of 24 quality shapes is 4.175 8-4.392 3, and the diversity index of 10 quantitative characters is 4.217 9-4.384 7. Based on the cluster analysis of phenotypic characters, twenty-one Hibiscus cultivars can be divided into three types when the Euclidean distance is 22, namely light color, dark double valve and single valve. Through principal component analysis, the nine principal components, including the number of flower colors, the length of the petals, the internal secondary color of the petals, and the distribution of the secondary petal color, can reflect the basic characteristics of 29 personality traits. The eigenvalues are greater than 1, and the cumulative contribution rate is 88.960%, indicating that the larger the flowers, and the more colorful the Hibiscus cultivars, the stronger the ornamental ability. In terms of correlation, there was a significant positive correlation between flower traits such as the flower halo relative petal area size (HAS), the petal secondary color distribution (DPS), and the petal internal secondary color (ISCP), with the correlation coefficients being greater than 0.800. The length of the petiole (LP), the leaf length (LL), and leaf width (WL), there was a significant positive correlation between double petality (PS) and the petal cleft (PC), and the correlation coefficients were 0.673, 0.702 and 0.796,respectively. 【Conclusion】 There was found to be a rich phenotypic diversity in the 21 Hibiscus cultivars. The external shape and color of flowers form the basis for Hibiscus classification. Tree shapes, growth habit and leaf base shapes also had a substantial impact on its morphological classification, which laied the foundation for the protection,the use of Hibiscus germplasm resources and research into new varieties.

Key words: cultivar of Hibiscus syriacus, phenotypic diversity, principal component analysis (PCA), cluster analysis

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