Some soil-borne microorganisms are known to have the ability to solubilize insoluble rock phosphate and this process often involves the excretion of organic acids. In this issue, we describe the characterization of a novel solubilizing mechanism used by a Streptomyces strain related to Streptomyces griseus isolated from Moroccan phosphate mines. This process involves the excretion of a compound belonging to the viridomycin family that was shown to play a major role in the rock phosphate bio weathering process. We propose that the chelation of the positively charged counter ions of phosphate constitutive of rock phosphate by this molecule leads to the destabilization of the structure of rock phosphate. This would result in the solubilization of the negatively charged phosphates, making them available for plant nutrition. Furthermore, this compound was shown to inhibit growth of fungi and Gram positive bacteria, and this antibiotic activity might be due to its strong ability to chelate iron, a metallic ion indispensable for microbial growth. Considering its interesting properties, this metabolite or strains producing it could contribute to the development of sustainable agriculture acting as a novel type of slow release bio-phosphate fertilizer that has also the interesting ability to limit the growth of some common plant pathogens.

中文翻译：

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源自灰链霉菌相关菌株的病毒霉素家族分子具有溶解岩石磷酸盐和抑制微生物生长的能力。

已知某些土壤传播的微生物具有溶解不溶性磷酸岩的能力，并且该过程通常涉及有机酸的排泄。在本期中，我们描述了与灰链霉菌相关的链霉菌菌株使用的新型增溶机制的表征从摩洛哥磷酸盐矿中分离出来。该过程涉及排泄属于病毒霉素家族的化合物，该化合物在磷酸盐岩生物风化过程中起主要作用。我们提出，由该分子对构成岩石磷酸盐的磷酸盐的带正电的抗衡离子的螯合导致磷酸盐岩石结构的不稳定。这将导致带负电荷的磷酸盐增溶，使其可用于植物营养。此外，该化合物显示出抑制真菌和革兰氏阳性细菌生长的能力，这种抗生素活性可能是由于其螯合铁的强大能力所致，铁是微生物生长必不可少的金属离子。考虑到它有趣的特性，