Brassica rapa is a crop belonging to the Brasicaceae family, which is widely grown throughout the world. Cultivation of crops of the species B. rapa are subjected to stressors that cause a decrease in production, such as drought or black rot caused by the bacterium Xanthomonas campestris. The need to find more sustainable alternatives to maintain production linked to intrinsic characteristics of the Brassica genus, such as the absence of relationships with mycorrhizal fungi, make brassica crops ideal to study the impact of endophytic fungi promoting plant growth. Endophytic fungi have been shown to improve plant performance and adaptation, whether under optimal or stressful conditions. In this paper, the fungal endophytic microbiome of the roots of five varieties of B. rapa has been isolated, identified and studied. A subset of fungi was selected, and preliminary inoculation tests were performed. The bioactivity of the selected fungi has been tested under optimal conditions, against X. campestris and drought stress. The inoculation assays show that the fungus Botrytis sp. (Br421) can be potentially useful to promote growth, while the fungi Alternaria sp. (Br261) can act as biological control agent against X. campestris as it delays the onset of disease symptoms. However, none of the fungus improved plant performance under drought conditions.

中文翻译：

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从萝卜 （Brassica rapa subsp. rapa） 根中分离的可培养内生真菌的多样性和生物活性


Brassica rapa 是属于 Brasicaceae 家族的一种作物，在世界各地广泛种植。B. rapa 物种作物的种植受到导致产量下降的压力源，例如由 Xanthomonas campestris 细菌引起的干旱或黑腐病。需要寻找更可持续的替代品来维持与芸苔属内在特征相关的生产，例如与菌根真菌没有关系，这使得芸苔属作物成为研究内生真菌促进植物生长的影响的理想选择。内生真菌已被证明可以提高植物的性能和适应能力，无论是在最佳条件下还是在胁迫条件下。在本文中，分离、鉴定和研究了 5 种 B. rapa 根的真菌内生微生物组。选择真菌的一个子集，并进行初步接种试验。所选真菌的生物活性已在最佳条件下进行了测试，对抗 X. campestris 和干旱胁迫。接种试验表明，真菌灰霉菌属 （Br421） 可能有助于促进生长，而真菌链格孢属 （Br261） 可以作为针对油菜霉的生物防治剂，因为它可以延缓疾病症状的发作。然而，在干旱条件下，这些真菌都没有改善植物的性能。