جستجوی مقالات مرتبط با کلیدواژه « asthma » در نشریات گروه « محیط زیست »

Palynology as a multidisciplinary science can be provided data base for a wide range of sciences such as the Plant systematics, Quality control of honey (Melissopalynology), Aeropalynology, Stratigraphy palynology, Forensic palynology, Paleoclimate, prediction and simulation of past climatic events, Archaeology, phylogeny and etc. Because of several cultivated and ornamental species are classified as allergenic plants, so identification, classification, and preparation of their database has particular importance. So far, no comprehensive study has been carried out on palynology in Iran. Therefore, it seems that carrying out a palynological study and preparing its database in Tehran is the first step in allergy studies. The objectives of this study are to investigate the morphological and micro-morphological characteristics, classification and preparing palynological database in Tehran.

Tehran has an area of about 600 km2 due to its location on the southern slopes of the Alborz Mountainous Region, widely extended along north to south and east to west zones, so showing a variety of climatic conditions that include diverse species (e.g. ornamental and etc.). So, review the published flora and present information on green space data bases in area, target taxa were selected. The plant samples were collected by field samplings and were deposited on the basis of standard methods. Finally, the pollen grains were coated with gold material. Then, they were scanned with Scanning Electron Microscopy (SEM). Afterward, they identified by diverse pollen references on palynology.

The results of this study include the preparation of a native visual source about the pollen grains of 145 species of shrubs and Cultivated Herbaceous Plant Species in Tehran. These 145 plant species belong to 65 plant families, including 95 herbaceous species and 50 shrub species. Asteraceae (16 species) and Rosaceae (14 species) have the most species. Among 131 genera studied, 43 genera were reported to be allergic that Asteraceae with 5 genera and then Cupressaceae and Oleaceae with 3 genera have the highest frequency of allergenic species among the studied families. The results of this study show that allergenic shrubs are more abundant than allergenic herbaceous plants. However, trees and shrubs have more allergenic effects due to more pollen production and wind pollination. The pollen grains of these species are usually small and can be scattered over long distances and have a longer durability in the air. The results of this study show that allergic pollens also have a high morphological diversity, however, the significant effect of pollen grain micro-morphological characteristics on allergies requires more extensive studies.

The achievements of this study will serve as a pilot for the study of palynological study, especially in asthma and allergy in the country. The results of this study show that in Tehran, several plant species have been planted without considering allergenic considerations, which should be considered as an important warning for ecological managers of the city.