application of culture filtrates of ophiostoma novo-ulmi and o. ulmi under in vitro condition as a bioassay to screen for disease tolerant ulmus parvifolia and ulmus campestris

کاربرد عصاره های فیلتر شده قارچ Ophiostoma novo-ulmi و در Ophiostoma ulmi در شرایط کشت بافت، به منظور غربال کردن و تحمل به بیماری مرگ هلندی نارون در نارون چینی (Ulmus parvifolia Jacq.) و اوجا(Ulmus campestris L.)

مقایسه ابعاد پریتسیوم دو گونه قارچ عامل بیماری مرگ نارون (Ophiostoma ulmi و O. novo-ulmi)

بیماری مرگ نارون یکی از مخرب‌ترین بیماری‌های پژمردگی آوندی در دنیا می‌باشد. دو قارچ Ophiostoma ulmi و O. novo-ulmi عوامل اصلی بیماری مرگ نارون در یک قرن گذشته بوده‌اند. این دو گونه امروزه براساس یک سری مشخصات مورفولوژیکی، فیزیولوژیکی و مولکولی از هم قابل تفکیک هستند. در این میان ابعاد پریتسیوم جدایه‌های دو گونه مزبور برروی محیط کشت عصاره مالت- آگار از مهم‌ترین عوامل تفکیک این دو گونه محسوب می‌ش...

Study on two species of Ophiostoma in relation with Dutch elm disease in Iran

An investigation was carried out in some areas of Golestan Province including: Loveh forest, Soosara, Daland forest park, Tooskestan; Gilan Province including Siahkal and Asalem forests; Arasbaran and landscape of urban trees during 1999–2007. In this investigation, based on some morphological, physiological and molecular characteristics and also comparison with standard isolates two species Op...

comparison of perithecium dimensions of ophiostoma ulmi and o. novo-ulmi, the causal agents of dutch elm disease

dutch elm disease is one of the most destructive vascular wilt diseases in the world. ophiosatoma ulmi and o. novo-ulmi had been the most important causal agents of the dutch elm disease in the last century. so, in order to manage of disease, their identification and distinction is necessary. these fungal species were distinguished based on morphological, physiological and molecular characters....

Influence of a Ceratocystis ulmi Toxin on Water Relations of Elm (Ulmus americana).

Water-soluble glycopeptides isolated from cultures of Ceratocystis ulmi have been reported to be toxins involved in Dutch elm disease. The influence of the glycopeptides on the water relations of Ulmus americana seedlings was tested by placing cut stems in glycopeptide preparations. After 4 hours in 200 micrograms per milliliter toxin the stem conductance of the seedlings was reduced by 79% and...

Genome-Wide Analysis of Secondary Metabolite Gene Clusters in Ophiostoma ulmi and Ophiostoma novo-ulmi Reveals a Fujikurin-Like Gene Cluster with a Putative Role in Infection

The emergence of new microbial pathogens can result in destructive outbreaks, since their hosts have limited resistance and pathogens may be excessively aggressive. Described as the major ecological incident of the twentieth century, Dutch elm disease, caused by ascomycete fungi from the Ophiostoma genus, has caused a significant decline in elm tree populations (Ulmus sp.) in North America and ...