Effects of arbuscular mycorrhizal fungi and nitrogen addition on nitrogen uptake of rice genotypes with different root morphologies

Ma, J.; Min, Xin; Xu, Chenchao; Zhu, Wanying; MAO, Chuan-Zao; Chen, Xin; Cheng, Leping

doi:10.17521/cjpe.2021.0155

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“…The morphology of the root plays a pivotal role in determining the capacity of the plant to locate and uptake nutrients from its growth medium [13]. The nitrogen uptake capacity of plants, as distinguished by their varied root morphology, was identified using nitrogen isotope labeling techniques [14]. Nevertheless, these techniques contribute to the expansion of the root absorption area.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang,

Cheng,

Twagirayezu

et al. 2023

Forests

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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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Section: Introductionmentioning

confidence: 99%