Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (10): 2220-2229.DOI: 10.3969/j.issn.1004-1524.2022.10.16

• Horticultural Science • Previous Articles     Next Articles

Content changes of cell wall composition during stem development in different varieties of Paeonia lactiflora

HOU Jinghan1(), WAN Yingling1, LIU Aiqing2, HONG Aiying2, LIU Yan1,*()   

  1. 1. Beijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, Beijing Laboratory of Urban and Rural Ecological Environment, School of Landscape Architecture, Beijing Forestry University, Beijing 100083, China
    2. Urban Management Development Center of Heze, Heze 274000, Shandong, China
  • Received:2022-02-09 Online:2022-10-25 Published:2022-10-26
  • Contact: LIU Yan

Abstract:

Straight stem is one of the vital standards to judge cut peony. However, the factors affecting stem verticality of Paeonia lactiflora are not clear at present. To clarify the changes of cell wall components in stem characteristics of varieties with different straightness, six varieties were studied, and three levels of straightness were divided based on the angle between flower and plumb line. The process from budding to flower blooming was divided into S1 to S5 stages. Then, the key stage of stem bending in varieties with different straightness and dynamic changes of cell wall components in five stages were studied. The results showed that two cut peonies, Dongfang Shaonv and Yangfei Chuyu had relatively most straight stems. Chifen and other two cultivars bent along with stem development from S2 stage, and Qingwen bent rapidly from S4 stage. Similar trends were found in various cultivars that lignin content increased along with development and water-soluble pectin decreased from S2 stage. Correlation analysis showed that there was a significant positive correlation between stem straightness and lignin content at early development stage. The stem straightness was positively correlated with lignin content and negatively correlated with propectin content in the middle stage of development. The stem straightness was positively correlated with hemicellulose content and lignin content, and negatively correlated with water-soluble pectin content. The result would provide a theoretical basis for breeding and cultivation regulation of cut herbaceous peonies.

Key words: Paeonia lactiflora, stem straightness, cellulose, hemicellulose, lignin, protopectin, water-soluble pectin

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