Contreras María José, Leal Karla, Bruna Pablo, Nuñez-Montero Kattia, Goméz-Espinoza Olman, Santos Andrés, Bravo León, Valenzuela Bernardita, Solis Francisco, Gahona Giovanni, Cayo Mayra, Dinamarca M Alejandro, Ibacache-Quiroga Claudia, Zamorano Pedro, Barrientos Leticia
Centro de Excelencia en Medicina Traslacional, Facultad de Medicina, Universidad de La Frontera, Temuco, Chile.
Instituto de Ciencias Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, Temuco, Chile.
Front Microbiol. 2023 Jul 19;14:1197399. doi: 10.3389/fmicb.2023.1197399. eCollection 2023.
Plant-microbiota interactions have significant effects on plant growth, health, and productivity. Rhizosphere microorganisms are involved in processes that promote physiological responses to biotic and abiotic stresses in plants. In recent years, the interest in microorganisms to improve plant productivity has increased, mainly aiming to find promising strains to overcome the impact of climate change on crops. In this work, we hypothesize that given the desertic environment of the Antarctic and the Atacama Desert, different plant species inhabiting these areas might share microbial taxa with functions associated with desiccation and drought stress tolerance. Therefore, in this study, we described and compared the composition of the rhizobacterial community associated with (Da), (Cq) from Antarctic territories, and (Cc), (Ei) and (Ns) from coastal Atacama Desert environments by using 16S rRNA amplicon sequencing. In addition, we evaluated the putative functions of that rhizobacterial community that are likely involved in nutrient acquisition and stress tolerance of these plants. Even though each plant microbial rhizosphere presents a unique taxonomic pattern of 3,019 different sequences, the distribution at the genus level showed a core microbiome with a higher abundance of , MND1 from the family, and unclassified taxa from and families in the rhizosphere of all samples analyzed (781 unique sequences). In addition, species and were shared by the core microbiome of both Antarctic and Desert plants. All the taxa mentioned above had been previously associated with beneficial effects in plants. Also, this microbial core composition converged with the functional prediction related to survival under harsh conditions, including chemoheterotrophy, ureolysis, phototrophy, nitrogen fixation, and chitinolysis. Therefore, this study provides relevant information for the exploration of rhizospheric microorganisms from plants in extreme conditions of the Atacama Desert and Antarctic as promising plant growth-promoting rhizobacteria.
植物与微生物群的相互作用对植物生长、健康和生产力具有重要影响。根际微生物参与促进植物对生物和非生物胁迫产生生理反应的过程。近年来，人们对利用微生物提高植物生产力的兴趣有所增加，主要目的是寻找有前景的菌株来克服气候变化对作物的影响。在本研究中，我们推测，鉴于南极和阿塔卡马沙漠的干旱环境，栖息于这些地区的不同植物物种可能共享具有与耐旱和干旱胁迫耐受性相关功能的微生物类群。因此，在本研究中，我们通过16S rRNA扩增子测序描述并比较了与南极地区的（Da）、（Cq）以及沿海阿塔卡马沙漠环境的（Cc）、（Ei）和（Ns）相关的根际细菌群落组成。此外，我们评估了该根际细菌群落可能参与这些植物养分获取和胁迫耐受性的假定功能。尽管每个植物的微生物根际呈现出3019个不同序列的独特分类模式，但在属水平上的分布显示出一个核心微生物群，在所有分析样本的根际中，来自科的、MND1以及来自科和科的未分类类群丰度更高（781个独特序列）。此外，南极和沙漠植物的核心微生物群共享物种和。上述所有类群此前都与对植物的有益作用相关。而且，这种微生物核心组成与在恶劣条件下生存的功能预测相符，包括化学异养、尿素分解、光能营养、固氮和几丁质分解。因此，本研究为探索阿塔卡马沙漠和南极极端条件下植物的根际微生物作为有前景的促生根际细菌提供了相关信息。
