Document Type : Original Article
Authors
1
Wheat Dis. Res. Dept., Plant Pathol. Res. Inst., A.R.C., Egypt
2
Plant Pathol. Dept., Fac. Agric., Zagazig Univ., Egypt
3
Wheat Res. Dept., Field Crop Res. Inst., A.R.C., Egypt
Abstract
Stem rust caused by Puccinia graminis Pers. f. sp. tritici Eriks. & E. Henn., has become a globally important disease for durum wheat (Triticum turgidum subsp. durum). The major obstacle in the control of such disease is the rapid loss of host genetic resistance, due to the high evolutionary potentiality of pathogen population that enables it to evolve new virulent pathotypes. Therefore, this study was carried out to characterize partial resistance (PR), as a more durable form of resistance in eight Egyptian durum wheat cultivars, compared to the check variety (Morocco) during seedling and adult plant stages. At seedling stage, TKTTC virulent race was used to study the components of partial resistant under greenhouse conditions. Partially resistance in cv. Sohag 3, characterized by its capacity to reduce both number of pustules/cm2 in leaf area, a pustule eruption percentage (%), and consequently prolonged latent period (LP). Out of the tested cultivars, four cvs., Sohag 5, Bani sweif 4, Bani sweif 6 and Sohag 3 proved to have an adequate and high level of PR, compared to the highly susceptible check, Morocco, as they exhibited low levels of stem rust severity under field conditions (3.99, 4.33, 7.49, 9.165, and 76.66%, respectively). The final rust severity (FRS%) percentages and area under disease progress curve (AUDPC) estimates, were found to be lower in its magnitude on PR cultivars than those in the highly susceptible ones, under field conditions in the two growing seasons: 2014/2015 and 2015/2016.
Keywords
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