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Xiangdong Huang, Dong Xue, and Lian Xue

Tree peony ( Paeonia suffruticosa ), known as the “queen of flowers,” is one of the most famous horticultural plants and has been cultivated throughout the temperate regions of the world. China is the country of first domestication and the origin

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Morihiko Hamada, Takashi Hosoki, and Toshiyuki Maeda

Potted plants of `Taiyoh' and `Hanakisoi' tree peony (Paeonia suffruticosa Andr.) were treated with a foliar spray of uniconazole or paclobutrazol for shoot length control. Uniconazole sprays at 25 or 50 ppm upon sprouting effectively reduced shoot length in both cultivars. The retarding effect was greater in `Taiyoh' than in `Hanakisoi' at 25 ppm. Uniconazole treatment did not influence flower diameter or days to flowering in either cultivar. Paclobutrazol sprays at 500 and 1000 ppm were less effective in reducing `Hanakisoi' shoot length than uniconazole sprays at 25 and 50 ppm. Chemical names used: E-1-(4-chlorophenyl)-4,4-dimethyl-2-(l,2,4-triazol-l-yl)-l-pentan-3-ol (uniconazole); (1RS, 3RS)-1-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-l-yl)-l-pentan-3-ol (paclobutrazol).

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Zhi-li Suo, Xiao-qing Zhao, Jing-yu Sun, and Wen-hai Sun

There exist large accumulations of natural genetic diversifications under the natural and artificial selections on the flower among the Chinese tree peony cultivars incited by ornamental and medicinal uses in the past over 1500 years in China. Paeonia suffruticosa `Xiao Ci Wei' is a unique Chinese tree peony cultivar possessing special bicolored petals with tubular tip structure (Paeoniaceae). This natural mutant is not only a unique ornamental, but also a valuable material for scientific researches in Evodevotics.

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Zhi-li Suo, Xiao-qing Zhao, Jian-peng Zhao, Xiao-chong Zhao, and Fu-fei Chen

Large natural genetic diversifications have occurred among Chinese tree peony cultivars under the natural and artificial selections on the flower for ornamental and medicinal uses in the past over 1500 years in China. Paeonia suffruticosa ‘Zi Mei You Chun’ X.Q. Zhao & J.P. Zhao & X.Z. Zhao & X.C. Zhao & Q.X. Gao & Z.Q. Zhao & J.X. Zhao & Z.L. Suo (Paeoniaceae) is a unique cultivar possessing side flowers and bicolored floral disc belonging to the Central Plains tree peony cultivar group of China. This natural mutant is not only an outstanding ornamental, but also a valuable material for scientific research on evolution of tree peony cultivars, metabolic pathways of pigments in the floral disc, origin of floral disc in Paeoniaceae, and other issues in plant evolutionary and developmental genetics.

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Zhi-li Suo, Wen-ying Li, Juan Yao, Hui-jin Zhang, Zhi-ming Zhang, and Di-xuan Zhao

Tree peony cultivars are usually classified according to flower characteristics (flower form and flower color) which are commonly affected by environmental influences and developmental levels. Judgment of flower forms may also depend on the observer. Precise and rapid cultivar identification methods are also required to manage cultivar collections as well as tree peony breeding programs. The objective of this paper is to analyze the discriminatory ability of leaf morphology and Intersimple sequence repeat (ISSR) marker systems for tree peony cultivars. As a result, although there exist large variations of leaf morphology of tree peony cultivars, the morphological characteristics of biternately compound leaves 3, 4, and 5 from the base of a shoot at the middle part of a plant are relatively stable with smaller variations within cultivars (2.7% to 27.1%, 16.8% on average) and with larger differentiations among cultivars (72.9% to 97.3%, 83.2% on average). Statistical and principal components analyses indicate that 12 leaf morphological characteristics are valuable for cultivar classification. ISSR markers present a precisely discriminatory power in tree peony cultivar classification without environmental influences. The cultivars with multiple flower forms, which makes it difficult to make judgment by means of a flower-form-based classification system, have been significantly characterized using leaf morphology or ISSR markers.

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Lin Zhou, Qianqian Shi, Yan Wang, Kui Li, Baoqiang Zheng, and Kun Miao

. ( A ) Paeonia suffruticosa ‘Yu Ban Bai’ (white-flowered cultivar). ( B ) P. suffruticosa ‘Zhao Fen’ (pink-flowered cultivar). ( C–F ) Separate individuals with orange, yellow-green, yellow, and purple-red flowers within a wild population of P

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Yuee Tian, Zhiping Che, Di Sun, Jiaxuan He, Shengming Liu, and Xiaomin Lin

geographical clustering in Paeonia suffruticosa based on flower colour J. Hort. Sci. Biotechnol. 93 416 424 Hansen, M.A. 2009 Botrytis blight of peony. Virginia Cooperative Extension, Petersburg, VA Liu, S.M. Che, Z.P. Chen, G.Q. 2016 Multiple

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Mingyue Bao, Minmin Liu, Qingxia Zhang, Tonglin Wang, Xia Sun, and Jinguang Xu

on yellow camellia (section Chrysantha Chang), medicinal chrysanthemum ( Chrysanthemum morifolium Ramat), beach rose ( Rosa rugosa Thunb.), and tree peony ( Paeonia suffruticosa Andr.) have shown that the content and components of anthocyanin are

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Yuee Tian, Zhiping Che, Di Sun, Yuanyuan Yang, Xiaomin Lin, Shengming Liu, Xiaoyu Liu, and Jie Gao

Paeonia suffruticosa in Luoyang J. Plant Prot. 44 623 629 (in Chinese) Yuan, J.H. Cheng, F.Y. Zhou, S.L. 2012 Genetic structure of the Tree Peony ( Paeonia rockii ) and the Qinling mountains as a geographic barrier driving the fragmentation of a large

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Yanjie Wang, Yeqing Chen, Man Yuan, Zeyun Xue, Qijiang Jin, and Yingchun Xu

expression of early biosynthetic genes occurred at early flower developmental stage of different color cultivars in Senecio cruentus ( Hu et al., 2009 ), Chrysanthemum morifolium ( Chen et al., 2010 ), and Paeonia suffruticosa ( Zhao et al., 2015a