A nursery comprising 25 elite bread wheat genotypes were evaluated to identify the sources of resistance to wheat blast caused by Magnaporthe oryzae pathotype Triticum (MoT), under artificial and natural infection experiments in three consecutive years from 2018 to 2020 in two different locations of Bangladesh. Seedling evaluation results revealed the absence of resistant and most genotypes displayed moderately susceptible to susceptible reaction. In the adult-plant field testing, six genotypes namely Borlaug 100, BARI Gom 33, BAW 1272, BAW 1280, BAW 1286, and BAW 1297 consistently showed resistant response to wheat head blast (WHB) infection with low levels of disease severity ranging from 0.2 to 8.1%. Among the remaining genotypes, some were moderately resistant, and the others exhibited various levels of susceptibility. The resistant genotypes that were most promising showed good agronomic performance under inoculated field trials. A significant positive correlation was observed between seedling and adult plant resistance. The above mentioned six genotypes also showed resistant reaction to WHB infection under controlled conditions when tested with three selected MoT isolates. The presence of 2NS/2AS translocation conferring WHB resistance was confirmed in four of the tested genotypes. Three (BAW 1272, BAW 1286, and BAW 1297) lines having non-2NS background exhibited good blast resistance under both the field and controlled conditions. These results will be useful for breeders and pathologists in exploiting the 2NS and non-2NS based resistant sources to pyramid and develop broad genetic based resistant germplasm.

对包含 25 个优良面包小麦基因型的苗圃进行评估，以确定由稻瘟病菌致病型小麦引起的小麦稻瘟病抗性来源(MoT)，从 2018 年到 2020 年连续三年在孟加拉国的两个不同地点进行了人工和自然感染实验。幼苗评估结果显示不存在抗性，并且大多数基因型对敏感反应表现出中度敏感。在成株田间试验中，六种基因型，即 Borlaug 100、BARI Gom 33、BAW 1272、BAW 1280、BAW 1286 和 BAW 1297 一致显示对小麦头瘟 (WHB) 感染的抗性反应，疾病严重程度较低0.2 至 8.1%。在剩余的基因型中，一些具有中度耐药性，而另一些则表现出不同程度的易感性。最有希望的抗性基因型在接种田间试验中表现出良好的农艺性能。在幼苗和成株抗性之间观察到显着的正相关。当用三种选定的 MoT 分离株进行测试时，上述六种基因型在受控条件下也显示出对 WHB 感染的抗性反应。在四种测试基因型中证实存在赋予 WHB 抗性的 2NS/2AS 易位。具有非 2NS 背景的三个（BAW 1272、BAW 1286 和 BAW 1297）品系在野外和受控条件下都表现出良好的抗爆性。这些结果将有助于育种者和病理学家利用基于 2NS 和非 2NS 的抗性来源来积累和开发基于遗传的广泛抗性种质。当用三种选定的 MoT 分离株进行测试时，上述六种基因型在受控条件下也显示出对 WHB 感染的抗性反应。在四种测试基因型中证实存在赋予 WHB 抗性的 2NS/2AS 易位。具有非 2NS 背景的三个（BAW 1272、BAW 1286 和 BAW 1297）品系在野外和受控条件下都表现出良好的抗爆性。这些结果将有助于育种者和病理学家利用基于 2NS 和非 2NS 的抗性来源来积累和开发基于遗传的广泛抗性种质。当用三种选定的 MoT 分离株进行测试时，上述六种基因型在受控条件下也显示出对 WHB 感染的抗性反应。在四种测试基因型中证实存在赋予 WHB 抗性的 2NS/2AS 易位。具有非 2NS 背景的三个（BAW 1272、BAW 1286 和 BAW 1297）品系在野外和受控条件下都表现出良好的抗爆性。这些结果将有助于育种者和病理学家利用基于 2NS 和非 2NS 的抗性来源来积累和开发基于遗传的广泛抗性种质。和 BAW 1297) 具有非 2NS 背景的线在现场和受控条件下都表现出良好的抗爆性。这些结果将有助于育种者和病理学家利用基于 2NS 和非 2NS 的抗性来源来积累和开发基于遗传的广泛抗性种质。和 BAW 1297) 具有非 2NS 背景的线在现场和受控条件下都表现出良好的抗爆性。这些结果将有助于育种者和病理学家利用基于 2NS 和非 2NS 的抗性来源来积累和开发基于遗传的广泛抗性种质。