Genetic resources are of paramount importance for developing improved crop varieties, particularly for biotic and abiotic stress tolerance. Spot blotch (SB) is a destructive foliar disease of wheat prevalent in warm and humid regions of the world, especially in the eastern parts of South Asia. For the management of this disease, the most effective measure is the development of resistant cultivars. Thus, the present investigation was carried out to confirm SB resistance in 200 germplasm accessions based on phenotypic observations and molecular characterization. These elite breeding lines obtained from the International Centre for Maize and Wheat Improvement, Mexico, are developed deploying multiple parentages. These lines were screened for SB resistance in the field under artificially created epiphytotic conditions during 2014–15 and 2015–16 along with two susceptible checks (CIANO T79 and Sonalika) and two resistant checks (Chirya 3 and Francolin). Eighty-two out of 200 germplasm accessions were found resistant to SB and resistance in these lines was confirmed with a specific SSR marker Xgwm148. Three accessions, VORONA/CNO79, KAUZ*3//DOVE/BUC and JUP/BJY//URES/3/HD2206/HORK//BUC/BUL were observed possessing better resistance than the well-known SB-resistant genotype Chirya3. These newly identified resistant lines could be used by wheat breeders for developing SB-resistant wheat varieties.

中文翻译：

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优质面包小麦 (Triticum aestivum L.) 种质对斑斑病 Bipolaris sorokiniana (Sacc.) Shoemaker 抗性的表征

遗传资源对于开发改良作物品种至关重要，特别是对于生物和非生物胁迫耐受性。斑斑病（SB）是小麦的一种破坏性叶面病害，流行于世界温暖潮湿的地区，特别是在南亚东部地区。对于这种疾病的管理，最有效的措施是开发抗病品种。因此，根据表型观察和分子特征，进行本调查以确认 200 份种质材料中的 SB 抗性。这些从墨西哥国际玉米和小麦改良中心获得的优良育种品系是利用多种亲本开发的。这些品系在 2014-15 和 2015-16 期间在人工创建的附生条件下筛选了田间的 SB 抗性以及两个易感检查（CIANO T79 和 Sonalika）和两个抗性检查（Chirya 3 和 Francolin）。发现 200 份种质中的 82 份对 SB 具有抗性，这些品系中的抗性通过特定的 SSR 标记得到证实Xgwm148. 观察到三个种质VORONA/CNO79、KAUZ*3//DOVE/BUC和JUP/BJY//URES/3/HD2206/HORK//BUC/BUL具有比众所周知的SB抗性基因型Chirya3更好的抗性。这些新发现的抗性品系可被小麦育种者用于开发抗 SB 小麦品种。