Evaluation of Reaction to Yellow Rust in Lines of Preliminary, Advanced, and Elite Regional Wheat Yield Trials of Temperate Zone (PRWYT, ARWYT, & ERWYT-M-82)
2005
Malihipour, Ali | Yassaei, Mohsen | Aghnoum, Reza | Safaei, Darioush | Ahmadian Moghaddam, Mohammad Sadegh | Houshyar, Rahim | Hassan Bayat, Zohreh | Najafian, Goudarz | Minoa, Javad | Tabei, Mohammad | Mofidi, Hosamaddin
In the present investigation, reaction of genotypes of preliminary and advanced regional wheat yield trials of 2003-2004 cropping season in moderate zone were evaluated to yellow rust for one year. A total of 517 accessions were evaluated at adult-plant stage in field under artificial epidemic conditions in different locations: a total of ~06 Preliminary Wheat Screening Nursery (PW8N), 231 Preliminary Regional Wheat Yield Trials CPR WYT), 60 Advanced Regional Wheat Yield Trials (ARWYT), and 20 Elite Regional Wheat Yield Trials (ERWYT) in six locations (Karaj, Zarghan, Mashhad, Kermanshah, Sari, and Miandoab). Wheat entries were planted during the last week of October 2003, at the rate of 8-10 g of seed in two 1m long rows and spaced 30cm apart. A susceptible cultivar (Bolani) was planted among the experimental entries (10 entry intervals) and also borders of the nurseries. Artificial inoculations of the nurseries were done 4-6 times in a period of two months starting at tillering stage using the relevant race of each location. The infection type (IT) of each entry was evaluated when the disease developed well on susceptible check. The percentage leaf area affected was also scored using Cobb's modified scale at the same time and coefficients of infection (Cl) were calculated. A heavy epidemics of the disease was established in all locations except Mashhad. Based on data collected, 128 (about 62%), 127 (about 55%), 47 (about 78%), and 16 (80%) genotypes of PWSN,PRWYT, ARWYT, and ERWYT were resistant to yellow rust in all locations, respectively.
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