Partial resistance to powdery mildew and leaf rust of wheat in Egyptian and CIMMYT genotypes | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 7, Volume 99, Issue 1, March 2021, Page 61-76 PDF (1.24 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2021.56575.1070 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Ibrahim S. Draz   1; Thanaa H. Abd El-Kreem2
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| 1Wheat Disease Research Department, Plant Pathology Research Institute, Agricultural Research Center, Giza, Egypt | ||||
| 2Wheat Research Department, Field Crop Research Institute, Agricultural Research Center, Giza, Egypt | ||||
| Abstract | ||||
| Powdery mildew caused by Blumeria graminis f. sp. tritici and leaf rust caused by Puccinia triticina are among the most important widespread diseases of wheat (Triticum spp.). Seedling and adult plant partial resistance were assessed for both diseases in 46 wheat genotypes, including 20 Egyptian cultivars and 26 CIMMYT genotypes, during two growing seasons (2018/19 and 2019/20) in Egypt. Four Egyptian cultivars (cvs), Misr-1, Misr-2, Misr-3, Giza-171 and eight CIMMYT genotypes, Jupateco-73-R, Pavon-F-76, Opata-85, Thew, Kiskadee-1, Chewink-1, Exchange, Quaiu-1 showed partial resistance to both diseases at the seedling stage. They recorded the longest incubation period (IP) and latent period (LP) for both diseases. Seven Egyptian cvs, Misr-1, Misr-2, Misr-3, Giza-168, Giza-171, Sids-13, Sids-14 and ten CIMMYT genotypes, Lee, Otane, Pavon-F-76, Opata-85, Tatara, Janz, Gatcher, Kenya-Sunbird, Exchange, Quaiu-1 appear to have consistently effective adult plant partial resistance to both diseases. They exhibited the lowest values of average disease index (ADI), average coefficient of infection (ACI), AUDPC, r-AUDPC. Strong inverse correlations observed between each of IP, LP and ADI, ACI and r-AUDPC indicate that seedling partial resistance traits (IP, LP) contribute to curbing the process of epidemic development under field conditions. Strong correlations observed between each of ADI, ACI and r-AUDPC imply that wheat breeders and pathologists may be able to assess their lines by a single scoring at an appropriate time. Cultivars with seedlings and adult plant partial resistance may be of value in breeding for durable resistance to powdery mildew and leaf rust under Egyptian field conditions. | ||||
| Keywords | ||||
| Wheat; Powdery mildew; Leaf rust; Partial resistance; Correlation Coefficient | ||||
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