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Zhang, Yuqin; Guo, Cun; Hu, Jing; Liu, Fangyu; Fu, Sha; Guo, Xiaomeng; Chen, Qian; Zhang, Li; Zhu, Lixiang; Hou, Xin
Agriculture (Basel), 02/2023, Volume: 13, Issue: 2Journal Article
Increasing shoot branch numbers of Chrysanthemum morifolium Ramat cv. Hangbaiju (Hangbaiju) is crucial for producing high flower yields. Pot experiments were designed to evaluate the effects of foliar application of 6-benzylaminopurine (6-BA) combined with prohexadione-Ca (Pro-Ca) on the yield and quality of Hangbaiju flowers. Foliar application of 6-BA combined with Pro-Ca typically increased leaf chlorophyll content and decreased leaf soluble sugar and soluble protein contents throughout the floral organ growth phase. At the bud formation phenophase stage (August), the contents of gibberellin (GA), indole-3-acetic acid (IAA), and zeatin (ZA) decreased (except for GA content in the 10 mg Lsup.−1 6-BA combined with 100 mg Lsup.−1 Pro-Ca treatment), but abscisic acid (ABA) content increased. The yield of Hangbaiju flowers was found higher in plants treated with foliar application of 6-BA combined with Pro-Ca. Higher yields were found in the 6-BAsub.5 + Casub.100 and 6-BAsub.10 + Casub.100 treatments than in the 6-BAsub.5 + Casub.50 and 6-BAsub.10 + Casub.50 treatments, and the highest yield was observed in the 6-Basub.5 + Casub.100 treatment both in 2019 and 2020. Nutritional indices such as soluble sugar, soluble protein, total amino acid, and water extract increased, and medicinal indices such as flavonoid, total phenolics, chlorogenic acid, cynaroside, and 3,5-dicaffeoyl quinic acid slightly decreased after foliar application of 6-BA combined with Pro-Ca; however, they were all higher than the standards recorded in the Chinese Pharmacopeia. Overall, foliar application of 6-BA combined with Pro-Ca could increase the yield and nutritional quality of Hangbaiju flowers, enhancing its tea quality.
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