Evaluation of resistance to cercospora in tolerant lines and cultivares in greenhouse condition and infected areas.
2008
Aqaei Zadeh, Mohsen | Sharifi, Hamid | Khodadadi, Shahram | Ranji, Zabih Ol-Lah | Kakuei Nezhad, Mozhdeh | Dastjerdi, Vali Ol-Lah | Keshavarz, Karim | Katal, Gholam Reza | A`rab Zadeh, Morteza | A`rab Salmani, Fatemeh | Mahmudi, Baqer
Sugar beet leaf spot disease is the most destructive foliage disease of this crop which causes heavy loss of root yield and sugar content in warm and wet condition. Breeding of resistant varieties is the best solution to overcome the disease. Determination of resistant sources is necessary for breeding desired varieties that can be obtained by evaluation of sugar beet germplasm. 200 sugar beet genotypes including monogerm and multigerm otypes (male strility maintainer) and pollinators were assessed for resistance to the disease during four years. Each year, some of the genotypes along with two resistant and two susceptible checks were evaluated in in vitro condition using leaf disk method. The Evaluation was carried out based on completely randomized design with three replications and each replication included 10 dispatched leaf disks belong to 10 leaves. The number of spots on the leaf disks was counted and the average number of each genotype was used for clustering them. The genotypes which were in the same category of resistant checks were evaluated in the field condition. The trial was carried out as observation trial using randomized complete block design with four replications to check the resistance of the selected genotypes. The treatments were scored twice based on 1-9 KWS scale. The scores were applied for cluster analysis and the genotypes of the resistant checks category were determined as tolerant materials. Two multigerm and one monogerm otypes along with one monogerm pollinator were the resistant genotypes which have resulted from this project.
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