Poster: Biology & Disease Mgmt: Genetics of Resistance
Monitoring of Leaf rust in seventeen Egyptian wheat cultivars during 2013/2014 and 2014/2015 seasons.
A. ABDELRHIM (1), M. Abou-Zeid (2), H. Abd-Alla (3), C. Cowger (4), A. El-Bana (3), M. Ismail (3) (1) North Carolina State University, U.S.A.; (2) Agriculture research center, Giza, Egypt, Egypt; (3) Minia University, Egypt; (4) North Carolina State Unive
Wheat cultivars’ response to leaf rust caused by Puccinia triticina Eriks. vary between seasons; some cultivars lose resistance over time due to factors such as appearance of new pathogen races that have new virulence genes which overcome Lr-genes. This study monitored leaf rust development for adult plant stage of 17 Egyptian wheat cultivars, expressed in terms of infection type, final rust severity, area under disease progress curve and rate of disease increase (r- value) during 2013/2014 and 2014/2015 growing season in Sids research stations, Egypt. According to the results, only two varieties (Sakha94 and Misr1) exhibited adult plant resistance, three varieties (Gemmiza9, and 10, and Misr2) were moderately susceptible, and twelve varieties (Sakha93, Giza168, and 171, Gemmiza7, and 11, Sids1, 12, and 13, Shandwile1, and Bani-Swif1, 5, and 6) were susceptible during 2013-2014 and 2014-2015 growing seasons. However, nine varieties (Sakha94, Misr1, and 2, Giza 168, and 171, Gemmiza 9, and 10, Sids 12 and 13) recorded low AUDPC up to 310 and the rest varied between 320:1120. Only five varieties (Sakha94, Misr1, Giza 168, and 171, and Gemmiza 9) recorded r-value up to 0.092, while the rest ranged from 0.11 to 0.195 in both seasons. These data may help researchers and breeders by shedding light on the response of some Egyptian varieties to leaf rust in the last two growing seasons, and helping track the virulence genes in P. triticina during the same seasons.