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Arbuscular Mycorrhizal Fungi Adjusts Root Architecture to Promote Leaf Nitrogen Accumulation and Reduce Leaf Carbon-Nitrogen Ratio of Mulberry Seedlings

文献类型： 外文期刊

作者： Zhang, Huirong 1 ; Cheng, Hongguang 3 ; Twagirayezu, Gratien 3 ; Zhang, Fang 2 ; Shi, Yanjin 2 ; Luo, Chaobin 2 ; Yan, Fan 1 ; Wang, Zhenhong 1 ; Xing, Dan 2 ;

作者机构： 1.Changan Univ, Key Lab Subsurface Hydrol & Ecol Effects Arid Reg, Minist Educ, Xian 710054, Peoples R China

2.Guizhou Acad Agr Sci, Inst Sericulture, Guiyang 550006, Peoples R China

3.Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China

4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

关键词： rocky desertification; arbuscular mycorrhizal fungi; root morphology; carbon-nitrogen ratio

期刊名称：FORESTS （ 影响因子：2.9； 五年影响因子：3.0 ）

ISSN：

年卷期： 2023 年 14 卷 12 期

页码：

收录情况： SCI

摘要： In the initial stages of restoring rocky desertification, the proliferation of nutrients strongly influences plant survival. The carbon-nitrogen doctrine in plants argues that a lower leaf carbon-nitrogen (C:N) ratio enhances the growth of plant nutrients. However, the mechanisms by which inoculation with arbuscular mycorrhizal fungi (AMF) can influence plants during the restoration of rocky desertification are not thoroughly understood. This study used mulberry as a suitable example of a mycorrhizal plant in desertification areas to examine changes in growth, leaf carbon, nitrogen accumulation, and the carbon-nitrogen ratio post inoculation using AMF. The correlation between leaf carbon-nitrogen ratio and root morphology following AMF inoculation was also examined. The results demonstrated that inoculating mulberry with the dominant strains Funneliformis mosseae (Fm) and Rhizophagus intraradices (Ri) not only enhanced above-ground growth and improved carbon and nitrogen nutrient absorption but also had a more pronounced effect on leaf nitrogen accumulation than on carbon accumulation, resulting in a potential decrease in the leaf C:N ratio by 42.13%. It also significantly improved root morphology by exponentially increasing the number of connections and crossings by 120.5% and 109.8%, respectively. Further analysis revealed a negative correlation between leaf C:N ratio and root morphology, as well as between root length and the number of connections. Plants with more developed root systems exhibited greater competitiveness for nitrogen, resulting in a lower leaf C:N ratio. This study suggests that the inoculation of AMF could enhance leaf nitrogen accumulation and reduce the leaf C:N ratio by expanding the spatial absorption range of the root through positive changes in root morphology, thereby promoting plant nutrient growth. This study forms a fundamental scientific basis for the successful management of desertification.

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