Effects of Drought Stress and Ectomycorrhizal Fungi on the Root Morphology and Exudates of Pinus massoniana Seedlings

被引：0
|
作者：
Li M. [1 ]
Zhao X. [1 ]
Wang H. [1 ]
Lu Z. [1 ]
Ding G. [1 ]
机构：
[1] Research Centre for Forest Resources & Environment of Guizhou Province, Key Laboratory of Forest Cultivation in Plateau mountain of Guizhou Province, College of Forestry, Guizhou University, Guiyang
来源：
Linye Kexue/Scientia Silvae Sinicae | 2022年 / 58卷 / 07期
关键词：
drought; ectomycorrhiza; Pinus massoniana; root exudates; soil enzyme;
D O I：
10.11707/j.1001-7488.20220707
中图分类号：
学科分类号：
摘要：
【Objective】 To study the effects of different ectomycorrhizal fungi inoculation under drought stress on the root growth, root exudates and rhizosphere soil enzyme activities of Pinus massoniana seedlings, and to understand the strategies of different ectomycorrhizal fungi to promote growth and resist stress. 【Method】 With the pot experiment in the greenhouse and two conditions of normal watering and drought stress, the difference in growth of above and below ground, root exudates and rhizosphere soil enzyme activities of different Pinus massoniana seedlings that respectively inoculated of Suillus placidus (Sp), Scleroderma citrinum (Sc) and uninoculated (CK) were studied. 【Result】 1) Drought stress inhibited growth and root vitality of P. massoniana seedlings, but Sc and Sp inoculation promoted seedling growth, biomass accumulation and root vitality, and also improved root morphology, with better performances in Sc inoculation seedlings. 2) A total of 6 types of organic substances, including acids, ketones, terpenoids, esters, alcohols and aldehydes, were detected in the root exudates, with a total of 28 compounds. The composition and relative content of secretions were regulated by inoculation and drought stress. Sc inoculation can increased the types of exudates while Sp inoculation decreased that; Drought stress increased the types of exudates and was not affected by inoculation; The relative content of various exudates responds obviously and differently to drought and inoculation treatments, and the change trends were related to the types of exudates. At the same time, the two ectomycorrhizal fungi also changed the relative content of various secretions under drought stress, mainly in inhibiting of the relative content of terpenoids, increasing of the relative content of aldehydes, and decreasing more in the relative content of acids. The effects of the two ectomycorrhizal fungi on the relative content of different compounds of the same component were also significantly different. 3) Sp inoculation treatment promoted plant growth and resists drought stress by increasing rhizosphere soil urease and invertase, while Sc treatment resisted drought stress by maintaining higher acid phosphatase and urease activities. 【Conclusion】Inoculation of Sp and Sc promoted the growth of P. massoniana and alleviate drought stress by improving root morphology, increasing root vitality and maintaining higher soil enzyme activities. Sc inoculation had the best effect on alleviating drought stress. Root traits and their changes under drought stress were complex and different after different mycorrhizal fungi inoculation. This is of great significance for understanding the mechanism of mycorrhizal fungi regulating root exudates in response to drought stress. © 2022 Chinese Society of Forestry. All rights reserved.
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页码：63 / 72
页数：9
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