Seedling and Slow Rusting Resistance to Stripe Rust in Chinese Common Wheats

Abstract

Identification of seedling and slow stripe rust resistance genes is important for gene pyramiding, gene deployment, and developing slow-rusting wheat cultivars to control the disease. A total of 98 Chinese lines were inoculated with 26 pathotypes of Puccinia striiformis f. sp. tritici for postulation of stripe rust resistance genes effective at the seedling stage. A total of 135 wheat lines were planted at two locations to characterize their slow rusting responses to stripe rust in the 2003-2004 and 2004-2005 cropping seasons. Genes Yr2, Yr3a, Yr4a, Yr6, Yr7, Yr9, Yr26, Yr27, and YrSD, either singly or in combinations, were postulated in 72 lines, whereas known resistance genes were not identified in the other 26 accessions. The resistance genes Yr9 and Yr26 were found in 42 and 19 accessions, respectively. Yr3a and Yr4a were detected in two lines, and four lines may contain Yr6. Three lines were postulated to possess YrSD, one carried Yr27, and one may possess Yr7. Thirty-three lines showed slow stripe rusting resistance at two locations in both seasons.

Evaluation of Ethiopian sorghum accessions for resistance against Colletotrichum sublineolum

“…However, all parameters correlated significantly and therefore FAS may be recommended as a time efficient method to evaluate sorghum genotypes for resistance to anthracnose. This is in agreement with previous studies that recommend single disease scoring as an efficient evaluation criterion in other pathosystems (Li et al 2006).…”

Characterization of a wheat HSP70 gene and its expression in response to stripe rust infection and abiotic stresses

“…Suwon11 displays HR upon infection with strain CYR23, but is susceptible to CYR31. Suwon 11 is presumed to contain the stripe rust resistant gene YrSu [28,29]. Wheat plants were grown and maintained following the description of Kang and Li [30].…”

Identification of Seedling Resistance Genes to Stripe Rust and Analysis of Adult Plant Resistance in 82 Wheat Cultivars from Gansu Province in China

“…Furthermore, the deduced cultivars and sources lost their resistance to stripe rust in field, causing serious outbreaks in many major wheat-growing regions since 1985. Previous studies determined that nine and nineteen Chinese wheat cultivars carried Yr9, approximately 19.39% and 21.43% of the totals, respectively (Wang et al, 1994;Li et al, 2006); thirteen commercial wheat cultivars of 52 varieties were from the Yunnan Province in China . In this study, only Longyuan 992 (No.…”