Blast disease is one of the most important diseases of rice with the fungus Magnaporthe oryzae as the causal agent. This research was carried out to evaluate the blast resistance in aerobic rice genotypes in comparison with Iranian lowland rice cultivars as a randomized complete block design by measuring area under the disease progress curve (AUDPC) on 53 rice genotypes with three replications in 2017 and 2018 years. Furthermore, molecular evaluation was done using 30 genes-based markers and linked SSR markers along with 60 random SSR markers. According to the results, aerobic rice genotypes, IR82310-B-B-67-2, IR82589-B-B-114-3, IR82616-B-B-64-3, IR82589-B-B-84-3, and IR82635-B-B-143–1 (ranged from 4.11 to 5.96) and Iranian rice cultivars Nemat, Sange-Tarom and Sepidroud (ranged from 4.46 to 4.72) had the lowest AUDPC, indicating they had the least infection severity during different stages of the experiment. Iranian native rice cultivars showed the most susceptibility, and association analysis via stepwise regression showed a significant relationship between some of the markers and AUDPC. Two gene-based markers of Pi5 and Pib and RM259 were detected in accordance with previous studies, and eight SSR markers (RM12091, RM217, and RM3498 with positive effect along with RM234, RM276 RM1300, RM8007 and RM480 with negative effect) were identified as informative markers in relationship with AUDPC for the first time. RM12091 and Pi5 had the highest adjusted R², accounting for 30.2% and 25.2% of AUDPC variation, respectively. The most effective identified markers could be considered in marker-assisted selection after final validation using different environments and genetic backgrounds. In addition, the results of this study can help demonstrate the significant potential of aerobic rice genotypes for resistance to blast disease.

稻瘟病是水稻的最重要的疾病的真菌的一个稻瘟病菌作为病因。这项研究旨在通过测量病程曲线下的面积（AUDPC）对53种水稻基因型在2017年和2018年的重复情况进行评估，与伊朗低地水稻品种相比，对有氧水稻基因型的抗瘟性进行了随机完整的块设计。 。此外，使用30个基于基因的标记和链接的SSR标记以及60个随机SSR标记进行了分子评估。根据结果​​，有氧水稻基因型IR82310-BB-67-2，IR82589-BB-114-3，IR82616-BB-64-3，IR82589-BB-84-3和IR82635-BB-143-1（伊朗水稻品种Nemat，Sange-Tarom和Sepidroud（范围从4.46至4.72）的AUDPC最低，表明它们在实验的不同阶段感染的严重性最低。伊朗本地水稻品种表现出最高的敏感性，通过逐步回归的关联分析显示某些标记与AUDPC之间存在显着关系。两种基于基因的标记根据先前的研究检测到了Pi5和Pib以及RM259，并鉴定了8个SSR标记（具有正效应的RM12091，RM217和RM3498以及具有负效应的RM234，RM276，RM1300，RM8007和RM480​​）作为与AUDPC相关的信息标记首次。RM12091和Pi5具有最高的调整后R ²，分别占AUDPC变化的30.2％和25.2％。在使用不同环境和遗传背景进行最终验证后，可以在标记辅助选择中考虑最有效的鉴定标记。此外，这项研究的结果可以帮助证明有氧水稻基因型具有抗稻瘟病的巨大潜力。