Postulation of seedling stem rust resistance genes of Yunnan wheat cultivars in China

Abstract

Li T.Y., Wu X.X., Xu X.F., Wang W.L., Cao Y.Y. (2016): Postulation of seedling stem rust resistance genes of Yunnan wheat cultivars in China. Plant Protect. Sci., 52: 242-249.To determine stem rust resistance genes of wheat varieties in Yunnan province, 11 Chinese strains of Puccinia graminis f.sp. tritici with different virulence and 1 artificial mutant strain were used in 110 wheat varieties. The results indicated that among the 45 Sr genes, Sr31, Sr5, SrTmp, Sr30, Sr36, Sr8a, Sr11, Sr24, Sr29, Sr34, Sr9e, Sr26, Sr38, Sr47, and SrTt3 were characterised in 55 wheat varieties singly or in combination. Sr5, Sr31, SrTmp, Sr36, and Sr30 were contained in 17, 16, 5, 5, and 3 cultivars, respectively. Six cultivars contained Sr24 and/or Sr34. Three plant materials likely contained one or more of Sr8a, Sr11, Sr34, and Sr23 genes as well as other unknown genes. The 16 immune or highly resistant varieties contained one or more of Sr9e, Sr26, Sr38, Sr47, SrTt3, and other unknown resistance genes. The reaction types on 22 of the tested cultivars were different from those on Sr genes tested, and their resistance genes could not be analysed. Additionally, 17 varieties were susceptible to all the tested strains, having no postulation value. Our study provides a basis for improved breeding of stem rust resistant wheat in China.

Mapping and Characterization of a Wheat Stem Rust Resistance Gene in Durum Wheat “Kronos”

“…Inoculation of the SrKN monogenic line Td31-5R and its sister line Td31-7S lacking SrKN with different Pgt races showed that this gene is ineffective against the evaluated races TTKSK, TKTTF, and JRCQC but confers resistance to the races BCCBC, TRTTF, 21C3CTTTM, 34MKGQM, 34MTGSM, and 34C3RTGQM (Supplementary Figure S3a; Table 3). Sr28 was evaluated against race TRTTF and another four races from China and was not effective against any of them (Li et al, 2016(Li et al, , 2018Babiker et al, 2017) (Table 3), supporting the conclusion from the genetic data that Sr28 and SrKN are two different genes.…”

Molecular marker dissection of stem rust resistance in Nebraska bread wheat germplasm

“…To confirm the presence of the expected genes in the tested nurseries we compared the infection type (IT) of the genotypes with the widely accepted IT of each gene illustrated by McIntosh et al . 34 , which has been reported as a fast and effective approach to determine stem rust resistance genes 35 . However, this may not always give an accurate prediction of a gene due to the epistatic interaction between the different resistance genes.…”

Journal of Plant Protection Research

“…This method, in combination with the use of molecular markers, can also be used to postulate the genes of adult plants (APR genes) (Wei et al 2015;Li et al 2018;Baidya et al 2019). A lot of work on the postulation of seedling leaf rust resistance genes has been done in China (Li et al 2010;Li et al 2016;Gebrewahid et al 2017). A similar approach, combined with the use of molecular markers, has been used by scientists from Egypt (Abouzied et al 2017).…”