Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, Profesor Albareda 1, 18008 Granada, Spain.
J Plant Physiol. 2010 May 15;167(8):614-9. doi: 10.1016/j.jplph.2009.11.010. Epub 2009 Dec 30.
The growth of legume plants is usually enhanced by the dual symbiosis of arbuscular mycorrhizal (AM) fungi and Rhizobium bacteria. However, most reports on this topic have been carried out under optimal water regime conditions. Here, four Phaseolus vulgaris varieties were single or dual inoculated with two different AM fungus and/or two different Rhizobium strains. All plants were grown under moderate drought conditions. Surprisingly, most of the biological treatments involving one fungus and one Rhizobium together caused a deleterious effect on plant growth. However, these negative effects were dependent on the P. vulgaris variety used as well as on the symbionts implicated. The results showed that AM symbiosis inhibited nodule development and N(2) fixation, causing diminution of plant growth. Therefore, under moderate drought conditions, the dual symbiosis formed by AM fungi and Rhizobium can be deleterious to P. vulgaris growth depending on the plant variety and the symbionts involved. Thus, under these common stress conditions, selection for the appropriated symbionts to each P. vulgaris variety is needed.
豆科植物的生长通常通过丛枝菌根（AM）真菌和根瘤菌的双重共生来增强。然而，大多数关于这个主题的报告都是在最佳水培条件下进行的。在这里，四个菜豆品种分别或同时接种了两种不同的 AM 真菌和/或两种不同的根瘤菌菌株。所有植物都在中度干旱条件下生长。令人惊讶的是，大多数涉及一种真菌和一种根瘤菌的生物处理对植物生长都有不良影响。然而，这些负面影响取决于所使用的菜豆品种以及所涉及的共生体。结果表明，AM 共生抑制了根瘤的发育和 N2 固定，导致植物生长减少。因此，在中度干旱条件下，AM 真菌和根瘤菌形成的双重共生可能对菜豆生长有害，具体取决于植物品种和涉及的共生体。因此，在这些常见的胁迫条件下，需要为每种菜豆品种选择适当的共生体。
