文献类型： 外文期刊

作者： Cao, Jinjin ¹ ; Zhu, Wei ¹ ; Zhang, Wei ¹ ; Chen, Xi ¹ ; Sun, Hongzhe ¹ ; Sun, Rongze ¹ ; Zhao, Jiageng ¹ ; Zhu, Shaocai ¹ ; Liu, Xiaofen ⁶ ; da Silva, Jaime A. Teixeira ⁴ ; Dong, Gangqiang ⁶ ; Yu, Xiaonan ¹ ;

作者机构： 1.Beijing Forestry Univ, Sch Landscape Architecture, Beijing 100083, Peoples R China

2.Beijing Key Lab Ornamental Plants Germplasm Innova, Beijing 100083, Peoples R China

3.Natl Engn Res Ctr Floriculture, Beijing 100083, Peoples R China

4.Beijing Lab Urban & Rural Ecol Environm, Beijing 100083, Peoples R China

5.Guangdong Acad Agr Sci, Environm Hort Res Inst, Guangdong Key Lab Ornamental Plant Germplasm Innov, Guangzhou 510640, Peoples R China

6.Amway China Bot R&D Ctr, Wuxi 214115, Peoples R China

关键词： Herbaceous peonies; Fleshy roots; Expansion; Environmental temperature; Physiological indices

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：4.3； 五年影响因子：4.5 ）

ISSN： 0304-4238

年卷期： 2024 年 331 卷

页码：

收录情况： SCI

摘要： The fleshy roots of herbaceous peonies serve as vital storage organs and are the primary source material for Chinese herbal medicine. Moreover, in certain cultivars, these roots can be propagated by root cuttings. However, the specific mechanisms governing the expansion and development of fleshy roots in herbaceous peonies currently remain unclear. To elucidate patterns of changes during the enlargement and development of herbaceous peony fleshy roots, this study assessed fleshy roots in six growth and development periods (P1-P6). By integrating environmental monitoring data, morphological, cytological, physiological and biochemical, as well as molecular characteristics across these developmental periods were compared. Both precipitation and temperature influenced the development of fleshy roots. The fastest enlargement of fleshy roots occurred under the following growth conditions: daily average precipitation = 5.6 mm; monthly average air temperature = 25.6 degrees C; monthly average soil temperature = 26.3 degrees C. Phloem and xylem, produced by the activity of vascular cambium, are important components of fleshy roots. Secondary xylem thickness consistently increased across the six developmental periods, resulting in the radial expansion of fleshy roots. When average monthly air and soil temperatures were about 26 degrees C, starch accumulated gradually in fleshy roots, and carbohydrates were mostly starch-based. However, when the average monthly air and soil temperatures decreased to about 11.0 degrees C, soluble sugar content increased. Endogenous hormones such as IAA, ZR, GA3, MeJA, and ABA played regulatory roles throughout the development of fleshy roots, and their levels and dynamic equilibrium were correlated with expansion rate. Elevated IAA and ZR content, and stabilized IAA/ABA and MeJA/ABA ratios, favored fleshy root expansion. Trends in the expression of three genes that play key roles in the expansion of fleshy roots (PlEXLB3, PlAUX1 and PlWRKY13) were consistent with morphological and physiological data, but PlHXK1 and PlIPT3 also play important roles. These findings lay a foundation for studying, in greater depth, the regulatory mechanisms governing the enlargement of herbaceous peony fleshy roots, and offer practical advice pertaining to field cultivation and management practices of this ornamental plant.