Showing 4 results for Riahi
Somayeh Keypour, Hossein Riahi, Mostafa Ebadi, Ali Borhani, Mohammad Reza Asef Shayan, Naser Safaie,
Volume 5, Issue 4 (12-2018)
Abstract
The genus Ganoderma belongs to Polyporales, well-known for its medicinal properties and as a plant pathogen. The aim of this study was to identify the genetic variation between populations of two Ganoderma lucidum Karst. complex isolates using RAPD. For this purpose, four populations of G. resinaceum Boud. and eight populations of G. lucidum collected and purified during 2011-2012, were studied for the first time in Iran. Ten random primers were used for RAPD reaction. The result for RAPD-PCR studies of G. lucidum complex showed a wide range of diversity, as scores of 61.48 and 40.16 were estimated for the inter-specific diversity of G. lucidum and G. resinaceum, respectively. Cluster analysis confirmed the separation of two species populations in different clusters. In the analysis of genetic structure, two probable groups (K = 2) were identified in the studied germplasm which was also confirmed by the results of bar plot.
Mehrshid Riahi, Sima Dastbarjan, Negin Jahani Seghaleh,
Volume 6, Issue 4 (12-2019)
Abstract
The phylogenetic relationships among 39 species belonging to 12 sections of Astragalus from Iran were studied on the basis of 29 morphological characters. The cladistics analysis of the morphological data was performed using PAUP* 4.0b10 program. The obtained data were compared with the molecular systematics data obtained from nuclear DNA ITS. In contrast with previous molecular systematic studies, the morphological data placed the sect. Caraganella as paraphyletic clade to the sects. Cenantrum, Nuculiella, and Eremophysa. Our results were similar to those obtained by previous molecular systematic studies which specified sects. Astragalus, Alopecuroidei and Laxiflori as paraphyletic clades. In accordance with data presented in previous molecular systematic studies, the species of the sect. Caprini showed close relationship with those in sects. Pelta and Pendulina. The present analysis, consistent with molecular systematic studies, rejected the monophyly of most sections studied. Therefore, although the circumscription of those sections needs to be carried out on the basis of the results of widely accepted molecular and morphological phylogenetic studies, future studies are needed to clarify and resolve some remaining ambiguities.
Fatemeh Daemi, Farideh Attar, Asghar Zamani, Mehrshid Riahi,
Volume 7, Issue 4 (12-2020)
Abstract
In the present study, seed surface ornamentations in 31 species (34 populations) and the capsule surface sculpturing in five species of the genus Scrophularia L. distributed in Iran were examined using Scanning Electronic Microscopy. Based on the published seed surface terminologies, all examined seeds show the reticulate pattern with scalariform inner ornamentations. However, there is enough but untrustworthy variations in epidermal cell shapes and the walls’ characteristics to divide the seed surface sculpturing patterns into four different groups: (1) cells with completely irregular shape; (2) cells without distinct shape so that their boundaries are not clear; (3) reticulate polygonal cells bordered with distinct walls neither undulate nor vesiculate, divided in two subgroups; forming elongated narrow cells and wide cells; (4) reticulate polygonal cells bordered with undulated or sometimes vesiculate walls divided in two subgroups; forming elongated narrow cells and wide cells. In addition, all the species' seeds can be alveolate, ridged or without distinct alveoli or ridges regarding their surfaces. There have also been variations in size, shape and color of the seeds even in a single individual. There are no applicable features of capsule surface sculpturing analyzed here, based on which species could be classified in certain groups.
Nasrin Farasat, Masoud Sheidai, Hossein Riahi, Fahimeh Koohdar,
Volume 9, Issue 3 (12-2022)
Abstract
The genus Ulva L. (Sea lettuce), one of the most valuable marine macroalgae, is found in shallow coastal areas and in brackish and fresh water around the world. Ulva species have nutritional and medicinal values in addition to other applications, and contain various compounds such as lipids, proteins and carotenoids. These species have high phenotypic plasticity and varied in response to different environmental conditions. In this study, 38 populations of 10 species of Ulva from the coastal areas of the Persian Gulf and Oman Sea, from different areas of Bushehr, Hormozgan and Sistan and Baluchestan provinces, were studied and identified on the basis of morphological and anatomical traits. Different populations showed variations in characteristics such as height, shape and color of thallus, number of pyrenoids and cell dimensions. Metabolites such as total protein, total oil, chlorophyll a, b and carotenoids contents were measured and compared among the different populations. The results should that the percentage of protein was highest in U. prolifera of Shif Island from Bushehr province as compared with the Ulva species studied, with about 26.5% of dry weight, and the percentage of total oil was lowest in U. flexuosa of Hakhamanesh region from Hormozgan province as compared with the species studied, with about 4.8% of dry weight. These results show that different environmental conditions affect the morphological and anatomical structure of species and the content of their metabolites. Due to the high-protein and low-calorie content of the Ulva genus and the importance of finding new and sustainable resources for food and pharmaceutical industries, the species of this genus have valuable potentials.
