Growth Phenotypes and Comprehensive Evaluation of 46 Tea Cultivars in Northern Guizhou

SUN Heng; YAO Hongjie; CHEN Yongkang; ZHANG Sha; GAO Manman

doi:10.13305/j.cnki.jts.2026.05.007

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Journal of Tea Science ›› 2026, Vol. 46 ›› Issue (5) : 821-830. DOI: 10.13305/j.cnki.jts.2026.05.007

Research Paper

Growth Phenotypes and Comprehensive Evaluation of 46 Tea Cultivars in Northern Guizhou

SUN Heng, YAO Hongjie, CHEN Yongkang, ZHANG Sha, GAO Manman^*

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Abstract

To comprehensively evaluate the growth performance of different tea cultivars in northern Guizhou and to screen for elite cultivars adapted to the local ecological environment, 13 growth phenotypic and quality indicators were measured using 46 tea cultivars as test materials. A comprehensive evaluation was conducted using the coefficient of variation, Shannon diversity index (H′), correlation analysis, principal component analysis and cluster analysis. The results showed that: ① There were highly significant differences (P<0.01) in the 13 indicators, with coefficients of variation ranging from 5.74% to 53.74%. Branch height (53.74%) and the phenol-to-amine ratio (30.68%) exhibited the greatest variation. The Shannon diversity index ranged from 1.72 to 2.04, indicating high genetic diversity. ② Free amino acid content was significantly negatively correlated with phenol-ammonia ratio and tea polyphenol content (P<0.001). 100-bud weight was significantly positively correlated with ground diameter, crown width, and leaf area (P<0.001), but significantly negatively correlated with germination density (P<0.001). ③ Six principal components were extracted by principal component analysis, with a cumulative contribution rate of 86.630%. The top five cultivars ranked by their comprehensive score were ‘Qianmei 601' ‘Zhongcha 108' ‘Yunkang 10' ‘Xueya 100', and ‘Zijuan'. ④ Cluster analysis divided the 46 cultivars into four groups, among which Group Ⅱ ‘Qianmei 601' ‘Zhongcha 108' ‘Yunkang 10' ‘Zijuan', and ‘Yujinxiang' exhibited strong growth vigor and high polyphenol content (18.41%). In conclusion, five cultivars including ‘Qianmei 601' demonstrated superior comprehensive traits and can be used as preferred materials for cultivar improvement and specialized product development in northern Guizhou.

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tea cultivars / growth phenotype / quality components / principal component analysis / cluster analysis

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SUN Heng, YAO Hongjie, CHEN Yongkang, ZHANG Sha, GAO Manman. Growth Phenotypes and Comprehensive Evaluation of 46 Tea Cultivars in Northern Guizhou[J]. Journal of Tea Science. 2026, 46(5): 821-830 https://doi.org/10.13305/j.cnki.jts.2026.05.007

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