نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه گیاهپزشکی، دانشکده علوم کشاورزی و صنایع غذایی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران.
2 موسسه تحقیقات اصلاح و تهیه بذر چغندرقند، سازمان تحقیقات، آموزش و ترویج کشاورزی؛ کرج، ایران.
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
The pathogen, Pythium aphanidermatum is one of the causal agents of sugar beet root rot in Iran. In order to evaluate the reaction of cultivars to the pathogen, at first, the screening method of evaluation was optimized. Then, a number of 24 cultivars that are commonly cultivated in Iran were evaluated against the pathogen. Three different evaluation methods in the greenhouse included three types of inoculation: grass leaf suspension, oospore suspension, and grass leaf suspension using through making wounds on the roots were compared with each other. A number of 12 cultivars were inoculated with these three inoculated methods. The results showed that positive and significant correlation of the three methods with each other. Then, 24 commercial sugar beet cultivars were evaluated with grass leaf suspension method in the greenhouse conditions. Based on the results of the evaluation of the 24 commercial cultivars of sugar beet and the comparison of the disease index of Pythium root rot based on Duncan's multi-range test, Ivano, Boomrang, Flores and Tous had the lowest rot index among the cultivars with the average index of 2.58, 2.65, 2.72 and 2.75 respectively and were introduced as resistant cultivars to the disease. Cultivars Jolgeh, Rasool, Shirin and Jam were categorized as susceptible.
کلیدواژه‌ها [English]
)