Selection and breeding of Magnolia 'Xiaodian Jiafen' based on genetic diversity

Ming-Zhu Liu, Hu Zhou, Rui He, Yan Tian, Wen-Xiao Tian, Qing-Min Wang, Gong-Yuan Xu, Zhou Yu, Yong-Jun Yu, Qing-Lin Liu
In order to understand the diversity of Magnolia germplasm and to assist in the breeding and selection of new cultivars, 48 traits of distinctness, uniformity and stability (DUS) for 98 individual magnolia plants found in Nanzhao County were investigated. A principal component analysis revealed that 18 principal traits were selected from 48 traits, which is enough to describe the magnolia plants. Of the 18 traits, approximately 78% related to flowers, such as the number of tepals and their color patterns. These flower traits proved to be the most important objectives for identifying new cultivars. An R-type cluster analysis proved that the 48 traits are independent or slightly related so as to be selected reasonably. A Q-type cluster analysis showed that the genotype could be used as higher criteria for cultivar classification, the tepal color could be the secondary criteria. The result showed that magnolia cultivars can be established only when the Square Euclidean Distance to similar cultivars ≥2.5. Based on the analysis described above, we scored 29 plants and analyzed their mean value. Finally, a new cultivar Magnolia 'Xiaodian Jiafen' was selected and granted PBR among three candidate cultivars.
Liu, Ming-Zhu, Zhou, Hu, He, Rui, Tian, Yan, Tian, Wen-Xiao, Wang, Qing-Min, Xu, Gong-Yuan, Yu, Zhou, Yu, Yong-Jun and Liu, Qing-Lin (2021). Selection and breeding of Magnolia 'Xiaodian Jiafen' based on genetic diversity. Acta Hortic. 1331, 21-34
DOI: 10.17660/ActaHortic.2021.1331.3
DUS traits, cluster analysis, cultivar classification, cultivar establishment

Acta Horticulturae