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9. Characterization of wheat monogenic lines with known Srgenes and wheat cultivars for resistance to three new races of Puccinia graminisf. sp. triticiin China

Author

WU, Xian-xin, ZANG, Chao-qun, ZHANG, Ya-zhao, XU, Yi-wei, WANG, Shu, LI, Tian-ya, and GAO, Li

Abstract

Wheat stem rust, caused by Puccinia graminisf. sp. tritici(Pgt), is a potentially devastating fungal disease of wheat worldwide. The present study was to evaluate the resistance of 42 wheat monogenic lines with known stem rust resistance (Sr) genes and 69 wheat cultivars to three new Pgtraces (34C0MRGQM, 34C3MKGQM, and 34C6MTGSM) identified from aeciospores at the seedling and adult-plant stages. The phenotyping results revealed that monogenic lines harboring resistance genes Sr9e, Sr17, Sr21, Sr22, Sr26, Sr30, Sr31, Sr33, Sr35, Sr36, Sr37, Sr38, Sr47, SrTmp, and SrTt3were effectively resistant to all three Pgtraces at the seedling and adult-plant stages. In contrast, monogenic lines containing Sr5, Sr6, Sr7b, Sr9a, Sr9d, Sr9f, Sr9g, Sr9b, Sr16, Sr24, Sr28, and Sr39were highly susceptible to these races at both seedling and adult-plant stages. The other lines with Sr8a, Sr10, Sr11, Sr13, Sr14, Sr15, Sr18, Sr20, Sr19, Sr23, Sr25, Sr27, Sr29, Sr32, and Sr34, displayed variable levels of resistance to one or two of the tested races. Seedling infection types (ITs) and adult-plant infection responses (IRs) indicated that 41 (59.4%) of the wheat cultivars showed high resistance to all the three races. Molecular marker analysis showed that four wheat culitvars likely carried Sr2, 20 wheat culitvars likely carried Sr31, 9 wheat culitvars likely carried Sr38, and none of the cultivars carried Sr24, Sr25, and Sr26. Our results provide a scientific basis for rational utilization of the tested Srgenes and wheat cultivars against these novel Pgtraces.

Published
2023
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25. Evaluation and identification of stem rust resistance genes Sr2 , Sr24 , Sr25 , Sr26 , Sr31 and Sr38 in wheat lines from Gansu Province in China.

Author

Xu XF, Li DD, Liu Y, Gao Y, Wang ZY, Ma YC, Yang S, Cao YY, Xuan YH, and Li TY

Abstract

Wheat stem rust, caused by Puccinia granimis f. sp. tritici , severely affects wheat production, but it has been effectively controlled in China since the 1970s. However, the appearance and spread of wheat stem rust races Ug99 (TTKSK, virulence to Sr31 ), TKTTF (virulence to SrTmp ) and TTTTF (virulence to the cultivars carrying Sr9e and Sr13 ) have received attention. It is important to clarify the effectiveness of resistance genes in a timely manner, especially for the purpose of using new resistance genes in wheat cultivars for durable-resistance. However, little is known about the stem rust resistance genes present in widely used wheat cultivars from Gansu. This study aimed to determine the resistance level at the seedling stage of the main wheat cultivars in Gansu Province. A secondary objective was to assess the prevalence of Sr2 , Sr24 , Sr25 , Sr26 , Sr31 , and Sr38 using molecular markers. The results of the present study indicated that 38 (50.7%) wheat varieties displayed resistance to all the tested races of Puccinia graminis f. sp. tritici. The molecular marker analysis showed that 13 out of 75 major wheat cultivars likely carried Sr2 ; 25 wheat cultivars likely carried Sr31 ; and nine wheat cultivars likely carried Sr38 . No cultivar was found to have Sr25 and Sr26 , as expected. Surprisingly, no wheat cultivars carried Sr24 . The wheat lines with known stem rust resistance genes could be used as donor parent for further breeding programs., Competing Interests: The authors declare there are no competing interests.

Published
2017
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