Rostaniha
Year:2002 | Volume:3 | Issue:1-4|Papers Count:16

The lichen specimens belonging to the order Lecanorales were collected from calcareous rocks in various areas of Mashhad. (Khorasan province). Specimens were taken back to the laboratory and identified. The identification of the species is based on morphology, anatomy and chemistry. They compose of 8 taxa belonging to 7 genera, namely, Lecanora conferta, L. muralis, Rhizocarpon umbilicatum, Dimelaena oreina, Toninia rosulata, Cetraria oakesiana, Candelariella sp. and Buellia sp., which are new reports for the Iranian lichen flora (Figs. 1-8).

Basidiocarps of species of Armillaria, Russula, Lactarius and Agaricus with fungal infection were collected from different regions of Iran. Portions of infected carpophores, were taken and cultured on PDA, PCA and MEA. Fungicolous isolates were identified on the basis of morphological characters such as: color and shape of colony, morphology and branching of conidiophores, manner of proliferation of the conidiogenous cells, conidial size, septation and ontogeny and forms of chlamydospores. The isolates were identified as: 1. Cladobotryum polypori (Dearness & house) Rogerson & Samuels (Fig. 2) From basidiocarp of Armillaria mellea, collected from Karaj, Tehran and basidiocarp of Lactarius vellerus, collected from Noor protected park, Mazandaran province. 2. Cladobotryum varium Nees (Fig. 3) From basidiocarp of Armillaria mellea, collected from Sisangan, Mazandaran province. 3. Cladobotryum verticillatum (Link) S. J. Hughes (Fig. 4) From carpophore of Russula sp., collected from Sisangan protected park, Mazandaran province. 4. Cladobotryum dendroides (Bulliard) W. Gams & Hoozemans From basidiocarp of Armillaria mellea, collected from Khosro-Shahr, E. Azarbaijan province, and Agaricus bisporus, collected from Karaj, Tehran province.

Seed dormancy has an important role in resistance and survival mechanisms of plants. Finding of some information about the range of primary dormancy and effective factors in dormancy breaking and optimal conditions of seed germination are necessary for weed control and other research purposes. In this research, the seeds of 10 species of grass weeds in Tehran province fields (Echinocloa crus-galli, Bromus tectorum, B. dantoniae, Hordeum glaucum, Setaria viridis, S. glauca, S. verticillata, Elymus repens, Phalaris minor and Sorghum halepense) have been studied. The results showed that seeds of all the species had high viability, The effects of some chemical, mechanical and temporal factors on seed dormancy breaking have been studied. Light had an inhibitory effect only in seed germination of Bromus spp. and H. glaucum and promoted germination in other species. Main factor of dormancy in all the species was in seed coat and pericarp. Of course there was a little of dormancy in embryo in some of them but B. dantoniae, S. halepense, E. repens and S. viridis specially had deep dormancy in embryo. Two different collected types of Ph. minor, had different primary dormancy in their seeds.

Following 3 species of Compositae are reported as new records to Iran: Cousinia pycnoloba, Lactuca dissecta and Launaea remotiflora. The collecting localities and their figures are given.

A new Cercospora species, namely, C. neriicola Ershad on Nerium oleander collected in Iran was described and illustrated. The new species was compared with C.nerii-indici, the other species on Nerium.

A new species of Tilletia, T. rostrariae Vanky & Ershad on Rostraria cristata is described and illustrated from Iran. It is compared with T. salzmannii, on the closely related Koeleria, and with the polyphagous T. bromi.

In this research, vascular plants of Bamu National Park (48000 ha.) situated In Fars province were studied. Analyses of all collected plants (450 species) showed that on account of climatic conditions, 94% of them were flowering in spring, also hemicryptophytes and therophytes possess abundant growth form with 39.6% and 23.5%, respectively. Phytogeographically, Irano- Turanian elements comprises 69% of species. Eighty eight species of the park are endemic in Iran. Finally, analyses of formations showed that cushion forms are abundant.

The taxonomy, morphology and distribution of rust species on Arundineae (Poaceae) in Iran was studied. Five species of Puccinia viz. P. magnusiana Korn., P. phragmitis (Schumach.)Korn., P. isiacae G. Winter, P. trabutii Roum. & Sacc. and P. akiyoshidanensis Morim. are described and illustrated. Of these, Puccinia akiyoshidanensis is considered as a distinct species and newly recorded for Iranian rust flora. Moreover, on the basis of examination of type and authentic materials, P. isiacae, P. trabutii, P. moriokaensis S. Ito and P. okatamaensis S. Ito are considered as distinct species. A distribution map and key to the identified Puccinia species on Arundineae in Iran is also given.

The effect of various NaCI treatments (0, 50, 100, 200 and 300 mM) at different growth and development stages (tillering, boot swelling, flowering and polination) of two wheat cultivars (Ghods : salt-sensitive; Boolani : salt-resistant) on proline concentration and the kinetic activity of proline dehydrogenase was studied under greenhouse conditions. Generally, in response to salinity treatments, the increase of proline level and the decrease of proline dehydrogenase activity in Ghods leaves were greater than in Boolani leaves. It is therefore concluded that, proline metabolism is probably one of the biochemical mechanisms influencing the response of these cultivars to salt stress.

Five taxa of Lepiota, namely, L. anthomyces, L. serena, L. metulaespora, L. roseoalba and L. cristata were collected from different localities are described in details. Microscopic and macroscopic descriptions along with drawings are given for all the five species. Of these L. anthomyces, L. serena, L. metulaespora and L. roseoalba, are newly recorded for Iranian fungus flora.