Evaluation of the morphological diversity of tea roses (Rosa x odorata) based on phenotypic traits

Abstract

Rosa x odorata (sect. Chinenses, Rosaceae) is an important species distributed only in Yunnan Province, China. There is an abundance of wild variation within the species. Using 22 germplasm resources collected from the wild, as well as R. chinensis var. spontanea, R. chinensis ‘Old Blush’ and R. lucidissima, this study involved morphological variation analysis, inter-trait correlation analysis, principal component analysis and clustering analysis based on 16 morphological traits. This study identified a high degree of morphological diversity in R. x odorata germplasm resources and the variation coefficients had a distribution range from 18.00 to 184.04%. The flower colour had the highest degree of variation, while leaflet length/width had the lowest degree of variation. Inter-trait correlation analysis revealed that there was an extremely significant positive correlation between leaflet length and leaflet width. There was also a significant positive correlation between the number of petals and duration of blooming, and the L* and a* values of flower colour were significantly negatively correlated. Principal component analysis screened five principal components with the highest cumulative contribution rate (81.679%) to population variance. Among the 16 morphological traits, style length, sepal width, flower diameter, flower colour, leaflet length and leaflet width were important indices that influenced the morphology of R. x odorata. This study offers guidance for the further development and utilization of R. x odorata germplasm resources.

Changes in Fruit Quality and Sugar Components of Wild Actinidia eriantha of Different Varieties (Lines) at the Ripening Stage

“…The larger the coefficient of variation of the trait, the greater the dispersion degree of the trait, indicating that the genetic background of the trait is richer, and that the selection space during breeding is also greater. On the contrary, the smaller the coefficient of variation, the smaller the discrete degree of the trait is, indicating that the stability of the trait is better [35]. The previous results of fruit quality determination and variation analysis of wild A. eriantha germplasm resources showed that the coefficients of variation among different fruit traits were quite different [15][16][17].…”

Comparative metabolomic analysis reveals nutritional properties and pigmentation mechanism of tea‐scented rosehips

“…Tea-scented roses, belonging to the genus Rosa in the family Rosaceae, are naturally distributed in Yunnan, China. 22,23 Located near the equator, Yunnan enjoys a warm and humid climate with diverse topography, including mountains, hills, basins, and valleys. This provides an excellent growth habitat for various roses, 24 including tea-scented roses, which enables researchers to gain a better understanding of their ecological characteristics, adaptability, and potential medicinal value, thus providing a scientific basis for their conservation and utilization.…”

“…23 Apart from their potential as materials for fragrance research and breeding, tea-scented roses also produce unique fruits. Compared to common rosehips such as R. canina and R. rugosa, tea-scented roses have both larger plants and larger flowers, 22 resulting in larger and more numerous fruits with a greater edible yield. The strong floral aroma of tea-scented roses also suggests that certain bioactive components in their flowers may also be found in their fruits, 25 enhancing the nutritional value of the rosehips and making them a potential source of functional foods.…”

“…Tea‐scented roses, belonging to the genus Rosa in the family Rosaceae, are naturally distributed in Yunnan, China 22,23 . Located near the equator, Yunnan enjoys a warm and humid climate with diverse topography, including mountains, hills, basins, and valleys.…”