در ايران UREDINALES جنبه هايي از بوم شناسي قارچهاي راسته

Some ecological aspects of rust fungi (Uredinales) in Iran

In this work the ecology of rust fungi in Iran is discussed on the basis of observations made in the field and relations between rusts and their hosts. The distribution and occurrence of the genera of rust fungi on the various Biotic provinces of Iran were studied. Some information regarding rust flora of halophytic plants in Iran is presented. Occurrence of some Iranian rust fungi in different habitats was studied and factors affecting the occurrence of rusts in Iran are discussed. The Iranian rusts are classified to montane rusts, hygrophilous rusts, drought resistant rusts, tolerant to the lower temperatures rusts and thermophilic rusts, on the basis of factors determining their occurrence in the different habitats. Some examples of stenotopic and eurytopic rust species in Iran are presented. The phenological rhythm of Tranzschelia discolor in Caspan biotic province was studied. Variations in the phenological rhythm have been observed between the populations of this species. The distance between the primary and secondary hosts in heteroecious rust species viz., Uromyces dactylidis, Puccinia recondita s ,l. and P. coronata was studied. The distance between the primary and secondary hosts was short in U dactylidis and P. recondita, while in P. coronata close vicinity of the primary and secondary hosts was not necessary for abundant infection. Some examples of collateral host Plants of rust fungi in Iran are recorded. The joint growth of Uromyces flectens and prasitic hyphomycete, Polythrinicum trifolii on the leaves of Trifolium sp. is recorded.