The aim of this work was to evaluate the effect of Pratylenchus brachyurus parasitism on the vegetative and nematological parameters of soybean, as well as on the productivity, composition, isoflavone profile and antioxidant capacity of the grains. A completely randomized design with four nematode inoculum levels (0, 500, 1000 and 2000) was used. Plants without P. brachyurus presented higher productivity and lower values for vegetative parameters. Maximum reproduction of P. brachyurus (17,493 nematodes) was observed with the initial population of 1444 nematodes. With increasing inoculum level, the moisture, fiber, lipid and stachyose contents were reduced, while ashes, fructose, and sucrose levels were increased. The total phenolic compounds, total flavonoids and antioxidant capacity increased until an inoculum level of 1000 nematodes was reached. The highest concentration of isoflavones, namely, daidzein, genistin, genistein, glicitin, and acetyl-glicitin was detected at the inoculum level of 2000 nematodes. Therefore, the inoculum levels of P. brachyurus affected soybean development, as well as, the chemical composition of the grains.

这项工作的目的是评估Prattylenchus brachyurus寄生对大豆营养和血液学参数的影响，以及对谷物的生产力，组成，异黄酮谱和抗氧化能力的影响。使用具有四个线虫接种水平（0、500、1000和2000）的完全随机设计。没有P. brachyurus的植物表现出更高的生产力和更低的营养参数值。Brachyurus的最大繁殖观察到（17,493个线虫），初始种群为1444个。随着接种量的增加，水分，纤维，脂质和水苏糖的含量降低，而骨灰，果糖和蔗糖的含量则升高。总酚类化合物，总类黄酮和抗氧化能力增加，直到接种量达到1000个线虫。在接种量为2000个线虫的情况下，检测到最高的异黄酮浓度，即黄豆苷元，染料木素，染料木黄酮，glicitin和乙酰-glicitin。因此，腕果假单胞菌的接种量影响了大豆的发育以及谷物的化学组成。