|Author:||Hamam, K. A. ; Salman, A. M. A.|
|Book Group Author:||NA|
Thirty-four barley genotypes, and 2 local barley control cultivars, were tested for resistance to drought and corn leaf aphid (Rhopalosiphum maidis) infestation in Sohag, Egypt during 2004-05 and 2005-06. Irrigation was done 8 times after planting irrigation (once every 2 weeks, normal irrigation); and 4 times (once every 4 weeks) after planting irrigation. Irrigation intervals affected pest density. The pest appeared on January, then increased in number gradually, and the peak was reached on the last week of March. The resistance of the genotypes can be divided into 4: highly resistant (1, 3, 4, 21, 23, 34 and Giza 128); moderately resistant (33 and Giza 127); susceptible (2, 5 and 6); and highly susceptible. Genotypes 1, 3, 4, 21, 23, 33, 34, Giza 127 and Giza 128 showed high yield under normal and limited irrigation, with potentially high resistance to drought. Genotypes 4, 7, 13, 15 and 29 showed the highest number of kernels/spike. Genotypes 13, 14, 20, 22 and Giza 128 showed the highest number of spikes/plant. The highest 1000-kernel weight was obtained from genotypes 3, 8, 26, 30 and Giza 128. Yield was strongly and negatively correlated with aphid number under normal and water stress treatments. Normal irrigation was strongly and negatively correlated with aphid density.
|Pages:||327 - 340|
|Journal:||Annals of Agricultural Science (Cairo)|
barley, drought resistance, genetic diversity, geneticvariation, genotypes, insect pests, irrigation, pest resistance, plantgenetic resources, plant pests, plant water relations, water stress,yield components, Egypt, Hordeum vulgare, insects, Rhopalosiphum maidis,North Africa, Africa, Mediterranean Region, Middle East, DevelopingCountries, Hordeum, Poaceae, Cyperales, monocotyledons, angiosperms,Spermatophyta, plants, eukaryotes, Rhopalosiphum, Aphididae, Aphidoidea,Sternorrhyncha, Homoptera, Hemiptera, insects, Hexapoda, arthropods,invertebrates, animals, drought tolerance, genetic variability,genotypic variability, genotypic variation, watering, Field Crops(FF005) (New March 2000), Plant Breeding and Genetics (FF020), PlantWater Relations (FF062), Plant Pests (FF620) (New March 2000),Environmental Tolerance of Plants (FF900), Host Resistance and Immunity(HH600)