Blast, caused by Pyricularia oryzae, on wheat can negatively impact yield. This study investigated the effect of blast on seed germination and kernel weight of seeds obtained from the infected spikes of plants from the wheat cultivars BR-18 (moderately resistant) and BRS-Guamirim (susceptible). Spikes of each plant were inoculated at anthesis (0) as well as at 7, 14, and 21 days after anthesis (daa) with a conidial suspension of P. oryzae. Non-inoculated spikes served as the control treatment. Seed germination and the weight of 1000 seeds were determined. Based on regression analyses, blast severity was great both at anthesis and 7 daa causing great reductions on seed germination and weight of 1000 seeds. Blast severity in the spikes of plants from cultivar BR-18 was reduced by 38, 35, 45, and 41% at anthesis and at 7, 14, and 21 daa, respectively, in comparison to spikes from plants of cultivar BRS-Guamirim. Blast severity was lower on spikes from 14 to 21 daa in comparison to anthesis and caused less impact on seed germination and weight of 1000 seeds. In conclusion, the negative effect of blast on seed germination and weight of 1000 seeds was dependent on the level of basal resistance of each cultivar and the time when the spikes were infected by P. oryzae.

由稻瘟病菌引起的爆炸对小麦可能产生不利影响。这项研究调查了爆炸对小麦品种BR-18（中等抗性）和BRS-Guamirim（易感）的受感染穗状花序获得的种子发芽和种子粒重的影响。在开花期（0）以及开花后（daa）的第7、14和21天，用稻瘟病菌的分生孢子悬浮液接种每株植物的穗状花序。。未接种的刺突作为对照处理。测定种子发芽和1000粒种子的重量。根据回归分析，在花期和7天时，稻瘟病的严重程度都很高，导致种子发芽和1000粒种子的重量大大减少。与来自BRS-Guamirim品种的穗相比，在花期和7、14和21 daa时，来自BR-18品种的穗的爆炸强度分别降低38％，35、45和41％。与花粉相比，从14到21 daa的穗状花序的爆破严重性较低，并且对种子发芽和1000粒种子的重量造成的影响较小。总之，爆炸对种子萌发和1000颗种子重量的负面影响取决于每个品种的基础抗性水平以及穗被穗侵染的时间。米曲霉。