Non-Specific Interactions of Rhizospheric Microbial Communities Support the Establishment of <i>Mimosa acutistipula</i> var. <i>ferrea</i> in an Amazon Rehabilitating Mineland
<i>Mimosa acutistipula</i> var. <i>ferrea</i> (Fabaceae) is endemic to ferruginous tropical rocky outcrops in the eastern Amazon, also known as <i>canga</i>. <i>Canga</i> are often associated with mining activities and are the target of protection and...
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| Autores principales: | , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/d830a5a660cb4464af19d8d323c92e11 |
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| Sumario: | <i>Mimosa acutistipula</i> var. <i>ferrea</i> (Fabaceae) is endemic to ferruginous tropical rocky outcrops in the eastern Amazon, also known as <i>canga</i>. <i>Canga</i> are often associated with mining activities and are the target of protection and rehabilitation projects. <i>M. acutistipula</i> stands out in this biodiversity hotspot with high growth rates, even in rehabilitating minelands (RMs). However, little is known about the diversity of soil microorganisms interacting with <i>M. acutistipula</i> in <i>canga</i> and RMs. This study analyzed the rhizosphere-associated bacterial and fungal microbial communities associated with <i>M. acutistipula</i> growing in an RM and a native shrub <i>canga</i>. The fungal phylum Ascomycota was the dominant taxa identified in the rhizosphere of the <i>canga</i> (RA: 98.1) and RM (RA: 93.1). The bacterial phyla Proteobacteria (RA: 54.3) and Acidobacteria (RA: 56.2) were the dominant taxa identified in the rhizosphere in the <i>canga</i> and RM, respectively. Beneficial genera such as <i>Bradyrhizobium, Rhodoplanes,</i> and <i>Paraconiothyrium</i> were identified in the rhizosphere of <i>M. acutistipula</i> in both areas. However, the analyses showed that the fungal and bacterial diversity differed between the rhizosphere of the <i>canga</i> and RM, and that the microbial taxa adapted to the <i>canga</i> (i.e., <i>Rasamsonia</i>, <i>Scytalidium</i>, <i>Roseiarcus</i>, and <i>Rhodomicrobium</i>) were lacking in the RM. This influences the microbe-mediated soil processes, affecting long-term rehabilitation success. The results showed that <i>M. acutistipula</i> established non-specific interactions with soil microorganisms, including beneficial taxa such as nitrogen-fixing bacteria, mycorrhizal fungi, and other beneficial endophytes, well known for their importance in plant adaptation and survival. High levels of microbe association and a plant’s ability to recruit a wide range of soil microorganisms help to explain <i>M. acutistipula</i>’s success in rehabilitating minelands. |
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