Papers by maneezheh pakravan
Iranian Journal of Botany, 2016
Mitotic chromosomes of 13 species from four sections (Cracca, Ervillia, Ervum and Variegata) of t... more Mitotic chromosomes of 13 species from four sections (Cracca, Ervillia, Ervum and Variegata) of the genus Vicia subgenus Vicilla were studied. Chromosome numbers of two species: V. armena, (2n=10) and V. multijuga (2n=10) are reported for the first time. 2n=14 for V. ciceroidea is a new count for this species, the previous report was 2n=28. Karyological data are presented for all the studied species. The chromosomes of all species were mainly metacentric to submetacentric. Based on Stebbines karyotype classification, the studied Vicia species were placed in three classes: 2A, 3A and 1B. V. monantha had the most symmetrical karyotype and could be considered more primitive than other studied species. Five species namely V. armena, V. aucheri, V. akhmaganica, V. persica and V. variegata showed 2n= 10 chromosomes and also had similar karyotype characters.
The morphology of 11 species of the genus Vicia from Iran was studied using Scanning Electron Mic... more The morphology of 11 species of the genus Vicia from Iran was studied using Scanning Electron Microscopy (SEM). The main pattern in seed coat sculpturing in the species was papillose, but the size and the number of side ribs in papillae and the density of papillae, were different in various species. Four morphological characters of seeds: relative hilum length and shape, relative position of the lens to hilum and seed circumference were constant. The results indicate that seed morphology is not useful in circumscribing sections in Vicia, but applicable in delimiting species and seed coat microsculpturing and testa patterns and that can provide additional characters for delimiting natural groups. However, the variation of these characters was too little to be applied for separating close species.
Alcea tiliacea is reduced into a variety of Alcea rhyticarpa. This new combination was made on th... more Alcea tiliacea is reduced into a variety of Alcea rhyticarpa. This new combination was made on the base of extensive morphological studies and SEM study of the seed coat surface. Main characters of both varietas and their geographical distributions are presented.
Rostaniha, Feb 24, 2003
A new Alcea species A. ilamica (Ma1vaceae), is described from Ilam province of Iran. The new spec... more A new Alcea species A. ilamica (Ma1vaceae), 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.
یافتههای نوین در علوم زیستی, Dec 1, 2018
The genus Zoegea L. belongs to Asteraceae family and has about 10 species in the world. This genu... more The genus Zoegea L. belongs to Asteraceae family and has about 10 species in the world. This genus is considered to be an Irano-Turanian and Mediterranean element and is distributed in south-western and central Asia and in the central, southern, north-western and south-western parts of Iran as well. The subspecies classification of the genus is not consensus and various classifications could be found in different taxonomy resources. In this study various specimens from different regions of Iran were studied. In addition, anatomical and palynological characters were used to perform a cluster analysis in order to determine species groups. In the end, our results confirmed that Z. baldschuanica and Z. glabricaulis were distinct species.
Pollen grains in seven species of Salix are studied with light Microscope and Scanning Electron M... more Pollen grains in seven species of Salix are studied with light Microscope and Scanning Electron Microscope. The results of LM showed that pollen grains are tricolpate and the overall shape is spherical to subprolate. In polar view, most of pollen grains were 3-lobed with convex lobes. The size of pollen was very variable. The Exine was reticulate. The characters of muri such as shape and size of lumen were varied in different species. The lumen was isodiametric or heteromorphic and the patterns were orbicular, elliptic or polygonal with rounded angle. Based on former studies the pollen grains in this study were referable to the following types: Salix alba type 6, S. issatissensis type 1, S. acmophylla, S. zygostemon and S. cinerea type 2, S. elbursensis type 5, S. excelsa type 3 and 6. Our results showed that shape and size of pollen grins are similar but the exine sculpturing is different and can be used for distinguishing the species. In addition, the exine pattern in S. zygostemon which is a hybrid species showed that S. cinerea is the male parent of this hybrid and the female parent is S. elbursensis.
Pakistan Journal of Biological Sciences, Jul 15, 2007
ﺟﻠﺪ 24 ﺷﻤﺎره ، 2 ﺻﻔﺤﻪ ، 403-392) 1396 (وﻳﮋﮔﻲ از ﺑﺮﺧﻲ ﺑﺮرﺳﻲ در اﻧﺪﻣﻴﻚ ﻣﺮﺗﻌﻲ ﮔ... more ﺟﻠﺪ 24 ﺷﻤﺎره ، 2 ﺻﻔﺤﻪ ، 403-392) 1396 (وﻳﮋﮔﻲ از ﺑﺮﺧﻲ ﺑﺮرﺳﻲ در اﻧﺪﻣﻴﻚ ﻣﺮﺗﻌﻲ ﮔﻮﻧﻪ ﺳﻪ روﻳﺸﻲ و ﻣﺤﻴﻄﻲ ﻫﺎي آذرﺑﺎﻳﺠﺎن اﺳﺘﺎن ﺷﺮﻗﻲ ﻃﻴﺐ ﻧﺎزﻳﻼ ﻧﮋاد 1 ﻋﺼﺮي ﻳﻮﻧﺲ ، 2 * ﭘﺎﻛﺮوان ﻣﻨﻴﮋه ، 3 ﻧﺠﻴﺐ ﻣﺤﻤﺪرﺿﺎ و زاده 4 ﺟﻠﺪ اﻳﺮان ﺑﻴﺎﺑﺎن و ﻣﺮﺗﻊ ﺗﺤﻘﻴﻘﺎت ﻓﺼﻠﻨﺎﻣﻪ 24 ﺷﻤﺎره 2 393 ﺟﻠﺪ اﻳﺮان ﺑﻴﺎﺑﺎن و ﻣﺮﺗﻊ ﺗﺤﻘﻴﻘﺎت ﻓﺼﻠﻨﺎﻣﻪ 24 ﺷﻤﺎره 2 403 Abstract Acantholimon gilliatii, Astragalus aharicus and A. neo-mobayenii are the endemic species with one population in East Azarbaijan. Previous observations of researchers have shown that survival of these species at risk and their distribution is being limited. In this study, topographic, climatic and soil characteristics were investigated in habitats of these species. Also, coverage, height density and phenology of the study species were determined by using 10 plots in each area with random method during 2013 and 2014. The habitat of A. gilliatii is very limited in the southern slopes of ...
The somatic chromosome numbers and karyotype of five species of Onopordum L. (Asteraceae) from Ir... more The somatic chromosome numbers and karyotype of five species of Onopordum L. (Asteraceae) from Iran were investigated. Our results confirm that all of the species are diploid (2n=34). First chromosome reports are presented for O. leptolepis DC., O. heteracanthum C. A. Mey. and O. carduchorum Bornm & Beauverd. Besides, the chromosome numbers of O. armenum Grossh., O. carduchorum and O. acanthium L. are reported from Iran for the first time, confirm the previous reports. Karyotype formulae for O. armenum, O. carduchorum and O. leptolepis were similar (1Sm+16m), for O. heteracanthum and O. acanthium were respectively 17m and 1M+16m+2B. Satellites were commonly found on submetacentric pairs, being also variable in morphology and location.
Sida rhombifolia which was collected from N Iran (Lowlands of No or to Chalus and Miyankaleh bios... more Sida rhombifolia which was collected from N Iran (Lowlands of No or to Chalus and Miyankaleh biosphere reserved) is reported as a new record from Iran.
Modern Phytomorphology, 2016
Ranunculus polyrhizos is reported as a new noteworthy record for the flora of Iran. This species ... more Ranunculus polyrhizos is reported as a new noteworthy record for the flora of Iran. This species was collected from alpine dry gravelly slope in Talesh Mountains. Taxonomic remarks and notes geographical distribution and habitat for this species are provided. Moreover nectar scale, pollen and achene micromorphological characters of the species are added and compared with related species.
Phytotaxa, Jan 4, 2023
The present study investigated the leaf anatomy of 12 species belonging to the genera Aristida an... more The present study investigated the leaf anatomy of 12 species belonging to the genera Aristida and Stipagrostis of the Aristideae tribe in Iran. Scanning electron microscopy (SEM) and light microscopy (LM) were used to observe the epidermal characteristics and transverse sections of the leaves to assess taxonomic applications of these traits. The main distinguishing traits of the species included: the presence of prickles, macrohairs and microhairs, papillae and type of wax, adaxial ribs, number of bulliform cells, number of sclerenchymatous layers and shape of silica bodies. When constructing the phenogram of Aristideae using WARD’s method and based on the 7 qualitative and 18 quantitative anatomical traits showed four taxonomic-anatomic clades with a cophenetic correlation coefficient of 1.75. Kranz anatomy in S. raddiana differed from the one seen inS. paradisea. The presence of papillae and lack of macrohairs on the leaf epidermis in S. karelinii distinguished it from S. pennata. By present findings the placement of A. coerulescens as a variety of A. adscensionis has not been ascertained. An identification key is providedbased on anatomical traits.The anatomical features of the leaves were proved to be useful for species delimitation and as a supplementary tool for identifying taxa and macromorphological traits.
Rostaniha, Feb 20, 2010
Ranunculus L. with about 600 species is the largest genus in the Ranunculaceae. Problems in the t... more Ranunculus L. with about 600 species is the largest genus in the Ranunculaceae. Problems in the taxonomy of the genus are due to high variability and polymorphism among different individuals and populations of certain species. Morphological characters of nectar scale have been considered as valuable taxonomical characters in some perennial species in some groups (Praemorsa, Grumosa, Rhizomatosa). To find out significant differences in characters among populations of certain species and among different species Analysis of Variance (ANOVA) was performed. In this study, herbarium specimens or fresh material were studied. Different shapes of nectar scale have been observed among populations of some species that is related to karyotype variability.
Arboriculture & Urban Forestry
BackgroundPlants are sensitive to air pollution by altering their vital processes such as growth ... more BackgroundPlants are sensitive to air pollution by altering their vital processes such as growth or photosynthesis. Leaf characteristics reflect the adaptive mechanism of plants to their environment. This mechanism is demonstrated through changes in anatomical, morphological, and physiological characteristics relative to environmental changes.MethodsSamples were taken from 2 species ofPlatanus orientalisL. andCeltis caucasicaWilld. in 10 urban forests of Tehran, Iran. In each study area, 50 leaves were collected from different directions of the canopy of each tree, and their area was measured by a leaf area meter instrument in a laboratory. Leaf moisture and specific leaf area (SLA) were also calculated. The data of air pollutants were obtained from the nearest pollution measurement stations to each study location.ResultsThe average percentage of moisture forP. orientalisandC. caucasicawas calculated as 49.6% and 41.9%, respectively. The averages of SLA were estimated 9.2 and 6.5 cm...
زیستشناسی کاربردی, 2011
The genus Malva L. with 8 species and 8 varieties in Iran has a wide spread distribution. For stu... more The genus Malva L. with 8 species and 8 varieties in Iran has a wide spread distribution. For studying the cladistic analysis of the species, 18 characters were studied. The characters have entered to the matrix as multistate character. For rooting the shortest tree, we have used three species: Alcea flavovirens, Althaea officinalis, Lavatera thuringiaca as out groups. By using parsimony analysis based on Fitch method the shortest tree with 8.67024 steps has resulted (RI=0.82, CI=0.64). The majority rules consensus tree has selected. The most parsimony cladogram didn't support monophyly of Malva species. The species in our analysis didn't occur in one clade. Also Bootstrap analysis didn't show the monophyly of Malva species.
Nonea Medik. is one of the major genera of Boraginaceae tribe Boragineae, with approximately 35 s... more Nonea Medik. is one of the major genera of Boraginaceae tribe Boragineae, with approximately 35 species in the world. In this study we focused on reproductive characters, which are not generally affected by environment. Our selected reproductive characters have been the stigma form, position of stigma towards the anthers, form of faucal scales, color, form and symmetry of flowers and characters of mericarps. An identification key using morphological and micromorphological characters has also been proposed. In the present paper above mentioned characters have been described for the first time in N. turcomanica M. Pop, N. lutea (Desr.) DC. var. flavescens Lipsky, N. persica Boiss. var. suchtelenioides (Riedl) Falatoury & Pakravan, N. diffusa Boiss. et Buhse, N. rosea (Bieb.) Link and N. melanocarpa Boiss. Nonea suchtelenioides H. Riedl has been decreased to the variety level of Nonea persica as N. persica Boiss. var. suchtelenioides (Riedl) Falatoury & Pakravan.
The pollen grains of 34 populations, representing 16 species of Consolida (DC.) Gray, have been e... more The pollen grains of 34 populations, representing 16 species of Consolida (DC.) Gray, have been examined by LM and SEM. The polar axis (P), equatorial diameter (E), P/E ratio and exine patterns were measured. The pollen grains were found out to be 3-zonocolpate, euprolate to subprolate. The shortest polar axis to belong to C. tehranica (Boiss.) Rech.f. and the longest to belong to C. trigonelloides (Boiss.) Munz (28.15-37.3 μm); the shortest equatorial axis to belong to C. stocksiana (Boiss.) Nevski. and the longest to C. orientalis Schrödinger (17.5-25.2 μm). Based on exine ornamentation observed under SEM, two types of pollen grains were recognized. Type I, exine distinctly thickened at poles with broad colpi and stronglymicro-echinate sculpturing, and type II, with exine obtuse at poles, narrow colpi and weekly micro-echinate sculpturing. Pictures of all species and characteristics of pollen grain structure were presented. Our results showed that pollen shape and sculpturing were...
Uploads
Papers by maneezheh pakravan