Leaf blast, caused by the hemibiotrophic fungus Pyricularia oryzae , is the most important disease affecting rice production worldwide. The present study investigated the potential of using glutamate (Glu) to increase rice resistance to leaf blast. Rice plants (cultivar Metica-1) were non-supplied (−Glu) or supplied (10 mM) (+Glu) with Glu and non-inoculated or inoculated with P. oryzae . Leaf blast severity and the number of lesions per cm 2 of leaf were significantly lower by 55 and 50%, respectively, for +Glu plants in comparison to -Glu plants at 96 h after inoculation (hai). The area under the leaf blast progress curve was significantly lower by 70% for +Glu plants in comparison to -Glu plants. For inoculated +Glu plants, the activities of chitinase, β -1-3-glucanase, phenylalanine ammonia-lyase, and polyphenoloxidases as well as the concentrations of total soluble phenolics and lignin-thioglycolic acid derivatives were significantly higher for inoculated +Glu plants in comparison to inoculated -Glu ones. The use of glutamate may become an alternative to be used in the management of rice blast in the context of a sustainable agriculture.

中文翻译：

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谷氨酸增强水稻抗稻瘟病

叶瘟是由半生物营养真菌 Pyricularia oryzae 引起的，是影响全球水稻生产的最重要的病害。本研究调查了使用谷氨酸 (Glu) 提高水稻对叶瘟抗性的潜力。水稻植物（栽培品种 Metica-1）不提供 (-Glu) 或提供 (10 mM) (+Glu) Glu 并且不接种或接种米疟原虫。与 -Glu 植物相比，在接种后 96 小时时，+Glu 植物的叶瘟严重程度和每 cm 2 叶片的病斑数分别显着降低了 55% 和 50% (hai)。与-Glu植物相比，+Glu植物的叶瘟进展曲线下面积显着降低了70%。对于接种+Glu的植物，几丁质酶、β-1-3-葡聚糖酶、苯丙氨酸解氨酶、与接种 -Glu 植物相比，接种 +Glu 植物的多酚氧化酶以及总可溶性酚类物质和木质素-巯基乙酸衍生物的浓度显着更高。在可持续农业的背景下，谷氨酸的使用可能成为稻瘟病管理的替代方案。