Banana anthracnose caused by is a serious postharvest disease. Use of fungicides has potential adverse effects on the environment safety and human health. Application of biological control agents (BCA) is a promising strategy for managing postharvest fruit diseases. In this study, sp. XT34 was isolated from the banana rhizosphere soil and exhibited a strong antifungal activity against Combining the phenotypic and whole-genomic alignment, strain XT34 was identified as Strain XT34 extracts reduced the disease incidence of anthracnose and maintained the fruit quality of banana. Treatment of extracts reduced the colonization of on fruit surface. The activity inhibition of cell wall-degrading enzymes maintained the cell-wall strength of fruit. The activity increase of defense enzymes contributed to the low disease symptom. It was supported by the differentially expressed genes (DEGs) related to supramolecular fiber organization and flavonoid biosynthesis In addition, spore germination of was effectively inhibited by extracts. The morphology of mycelia and spore become wrinkled and ruptured. The treatment of extracts increased the optical density of A and soluble sugar and protein contents of . The integrity of cell membrane was also destroyed, reflecting on an increase in electrical conductivity and malondialdehyde. Several metabolites were found in the genome of strain XT34 using antiSMASH. Eleven volatile compounds were identified by gas chromatography-mass spectrometer (GC-MS). Notably, strain XT34 and extracts exhibited a broad-spectrum antifungal activity against eight phytopathogenic fungi. Hence, XT34 provides a potential BCA to control banana anthracnose

中文翻译：

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产色链霉菌XT34对香蕉炭疽病的生防效果及潜在机制

香蕉炭疽病是一种严重的采后病害。杀菌剂的使用对环境安全和人体健康具有潜在的不利影响。应用生物防治剂（BCA）是管理采后水果病害的一种有前途的策略。在这项研究中，sp。 XT34是从香蕉根际土壤中分离得到的，对香蕉炭疽病表现出较强的抗真菌活性，结合表型和全基因组比对，鉴定菌株XT34，菌株XT34提取物降低了香蕉炭疽病的发生率，保持了香蕉的果实品质。提取物的处理减少了果实表面的定殖。细胞壁降解酶活性的抑制维持了果实细胞壁的强度。防御酶活性的增加有助于减轻疾病症状。它得到了与超分子纤维组织和类黄酮生物合成相关的差异表达基因（DEG）的支持。此外，提取物还有效抑制了孢子萌发。菌丝体和孢子的形态变得起皱和破裂。提取物的处理增加了A的光密度以及可溶性糖和蛋白质的含量。细胞膜的完整性也被破坏，反映出电导率和丙二醛的增加。使用 antiSMASH 在菌株 XT34 的基因组中发现了几种代谢物。通过气相色谱-质谱仪 (GC-MS) 鉴定了 11 种挥发性化合物。值得注意的是，菌株 XT34 和提取物对八种植物病原真菌表现出广谱抗真菌活性。因此，XT34为控制香蕉炭疽病提供了潜在的BCA