نشریه رستنیها
سال چهارم شماره 2 (پیاپی 17، پاییز و زمستان 1382)

In this study, four specimens belonging to Karaj mycoflora were examined. According to the results, two form – species; Diplosporonema delastrei, on Silene latifolia subsp. persica and Piggotia ulmi, on Ulmus sp. are reported with new names. For some of the identified fungal specimens, new hosts (matrix nova) are introduced. Moreover, many taxa such as , Marssonina kriegeriana on Salix sp., Septoria polygonorum on Polygonum persicaria, Stagonospora dolosa on Phragmites communis, Platychora ulmi on Ulmus sp., Polystigmina sp. on Cerasus sp. and Ramularia decipiens on Rumex sp., are studied and documented as less – known form – species.

In the continuation of studies on Alternaria species, some 500 isolates were obtained from seeds, soil and plant parts from various localities of Iran. Prior to morphological examination, pure cultures were obtained by single conidium and single chain methods. Descriptions for each taxon are based on cultures developed on potato carrot agar. Inoculated plates were incubated at 23-25°C under a cool-white fluorescent light/dark cycle of ca. 8/16 hrs. Microscopic examinations were carried out after 5-7 days. Conidiophores, conidia and sporulation patterns were studied and recorded. Seven species of Alternaria are introduced and described in the present investigation, five of which (A. chlamydospora, A. cinereariae, A. infectoria, A. mouchaccae and A. porri) are new to the mycoflora of Iran. Other two species, A. brassicae and A. japonicae, that have been reported from Iran previously, are described here with.

Effect of various NaCl treatments (0, 50, 100, 200, and 300 mM) at different growth and development stages (tillering, boot swellen, flowering and anthesis) in two wheat cultivars (Ghods: salt – sensitive, Boolani: salt – resistant) on SDS-PAGE electrophoretic pattern of leaf proteins was studied under greenhouse conditions. Generally, in response to salinity treatments, the decrease in protein synthesis in Ghods was more than that of Boolani and the increase of protein bands in Boolani was more than that of Ghods. Therefore, it seemed that Boolani had more ability in maintaining its leaf proteins in response to salt. Thus, from biochemical point of view, Boolani was introduced as a cultivar with more resistance to salinity stress.

Based on the floristic study of rust fungus flora (Uredinales) ofGolestan National Park, located in the Northeast of Iran, 68 rust taxa were recognized. Of these, one subspecies and five species viz. Phragmidium sanguisorbae subsp. mediterraneum on Sanguiosorba minor, Puccinia difformis on Galium aparine, P. jasmini on Jasminum fruticans, P. rhylismoides on Thalictrum isopyroides, Uromyces mogianensis on Fri/ii/aria gibbosa and U. transcaspicus on As/raga/us citrinus are recorded as new additions to Iranian rust flora. Moreover, Thalictrum isopyroides and Fri/ii/aria gibbosa are recorded as new hosts (Matrix Nova) for Puccinia rhytismoides and Uromyces mogianensis, respectively.

To study the phylogenetic relationships between Erysiphe s. lat. and Microsphaera, the nucleotide sequences of internal transcribed spacers ofrDNA including 5.8S rDNA gene were determined for 23 taxa. The results showed that Erysiphe. section Erysiphe and Microsphaera are closely related and clustered together with strong bootstrap support (100%). All oftaxa belonging to this group produce conidia singly. Whereas, these genera are distinguished by the morphology of appendages which is dichotomously branched in Microsphaera and mycelioid in Erysiphe. Erysiphe. sect. Golovinomyces and Erysiphe. sect. Galeopsidis, both of which are well characterized by conidia produced in chains, formed two different groups. The percentages of sequence divergence ranged from 2 to 7.8% between Microsphaera and Erysiphe. sect. Erysiphe.

A new Alcea species A. ilamica (Malvaceae), is described from Ilam province of Iran. The new species belongs to the sect. Pterocarpa. Differences from other Iranian species and its geographical distribution are discussed. SEM study of penicillate hairs showed that, A. ilamica is very similar to A. aucheri but has advanced characters. Illustrations and a distribution map are given '>A new Alcea species A. ilamica (Malvaceae), is described from Ilam province of Iran. The new species belongs to the sect. Pterocarpa. Differences from other Iranian species and its geographical distribution are discussed. SEM study of penicillate hairs showed that, A. ilamica is very similar to A. aucheri but has advanced characters. Illustrations and a distribution map are given.