Effects of Root Exudates from Picea asperata Seedlings on the Seed Germination and Seedling Growth of Two Herb Species

被引：0
|
作者：
Jiang Z. [1 ,3 ]
Yu Q. [1 ,4 ]
Qiao M. [1 ,2 ]
Xiao J. [5 ]
Zhang Z. [1 ,3 ]
Yin H. [1 ,5 ]
机构：
[1] CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu
[2] Sichuan Tourism University, Chengdu
[3] University of Chinese Academy of Sciences, Beijing
[4] Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu
[5] College of Environmental Science and Engineering, China West Normal University, Nanchong
来源：
Linye Kexue/Scientia Silvae Sinicae | 2019年 / 55卷 / 06期
关键词：
Root exudates; Seed germination; Seedling growth; Subalpine coniferous plantation;
D O I：
10.11707/j.1001-7488.20190619
中图分类号：
学科分类号：
摘要：
Objective: This study aimed to investigate the ecological effects of root exudates input on herb species from seed germination and seedling growth.Method: We performed an experiment on acceptors(Trifolium repens and Medicago sativa) in which in situ exudates were collected from Picea asperata seedlings.Result: 1) Root exudates decreased the germination rate, germination vigor and germination index of the two herb species seeds, and significant differences were observed on the M. sativa seedlings. 2) Similarly, both the fresh weight and dry weight of two herb species seedlings were decreased under root exudates treatments, and significant differences were also observed on M. sativa seedlings. 3) Root exudates additions reduced the total length, total surface area and total volume of two herb species seedlings. Among them, significant differences were found only for the total length. 4) Synthesis effect was a vital index of allelopathy. Further analysis showed that the synthesis effects of root exudates on seed germination and seedling growth of two herb species seedlings were negative. And the allelopathy to M. sativa was stronger than that to T. repens. 5) The analysis of root exudates showed that numerous phenolic acids were found in the root exudates of P. asperata seedlings.Conclusion: 1) Our result manifested that the root exudates from P. asperata seedlings had obvious inhibitory effects on the seed germination and seedling growth of the herb species. 2) Numerous phenolic acids in the root exudates maybe one of major reasons for the observed inhibiting effects of root exudates. © 2019, Editorial Department of Scientia Silvae Sinicae. All right reserved.
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页码：160 / 166
页数：6
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