Detection of rust resistance in selected Zimbabwean and ICARDA bread wheat (Triticum aestivum) germplasm using conventional and molecular techniques
Host resistance is the most effective and economical method to minimise yield losses caused by rusts. The aim of this study was to detect the presence of resistance in 75 wheat genotypes. The presence of the genes Sr2, Sr24, Lr34, Lr37, Lr46 and Lr68 was investigated using simple sequence repeat and sequence tagged site markers. Quantitative aspects of resistance to leaf rust were assessed through infection response, disease severity, coefficient of infection (CI), disease incidence (DI), leaf tip necrosis (Ltn) and area under disease progress curve (AUDPC) under natural epidemics. Highly significant (p ≤ 0.001) differences were observed among the genotypes for CI, DI, AUDPC and relative AUDPC (rAUDPC). Twenty genotypes exhibited high levels of adult-plant resistance, showing CI less than 20% and AUDPC less than 300%, with moderately susceptible to susceptible reactions. The most frequently occurring gene was Lr46 (21%), followed by Lr68 (20%), Lr34 (19%), Lr37 (11%), and Sr24 (0%). Selection for Lr34 and Lr46 based on Ltn alone can sometimes be misleading because of its variable expression in different genetic backgrounds. Cultivars grown in Zimbabwe lacked important rust resistance genes.
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Title: Sources of resistance in durum wheat and its wild relatives to Russian wheat aphid (Hemiptea: Aphididae) Author: Al - Ghannoum, M. I.; 0000-0001-8945-3126; ORCIDDate: 2016-06-30Type: Journal ArticleStatus: Open accessRussian wheat aphid (RWA), Diuraphis noxia (Kurdjumov), is a serious pest of cereals in many parts of the world, particularly in dry areas. As limited resistance sources to this pest were previously identified in durum ...
Title: Evaluation of durum wheat for Russian wheat aphid resistance: Damage of Russian wheat aphid Author: El Bouhssini, Mustapha; 0000-0001-8945-3126; ORCIDDate: 2000-01-30Type: ImageStatus: Open accessimages of damage of Russian wheat aphid from IPM of insect pests - Russian Wheat Aphid project: Evaluation of durum wheat for Russian wheat aphid resistance experiment 2000.
Title: Evaluation of durum wheat for Russian wheat aphid resistance: Russian wheat aphid adults and leaf damage Author: El Bouhssini, Mustapha; 0000-0001-8945-3126; ORCIDDate: 2000-01-30Type: ImageStatus: Open accessImage of Russian wheat aphid adults and leaf damage from IPM of insect pests - Russian Wheat Aphid project: Evaluation of durum wheat for Russian wheat aphid resistance experiment 2000.