نتایج جستجو برای: as indices for genetic diversity
تعداد نتایج: 11975726 فیلتر نتایج به سال:
comparative assessment of genetic diversity of 122 durum wheat genotypes (triticum turgidum l. var. durum) was performed using 73 ssap polymorphic fragments, 123 aflp polymorphic loci and 104 ssr alleles. ssap and aflp data showed a clear demarcation between the cultivars and landraces and ssr data classified cultivars and landraces according to their origin. furthermore, the estimated genetic ...
Recent attitude of vegetation assessors is using of new ecologic approaches to evaluate and analyse the complex rangeland ecosystems. Plant diversity is the most important indices to assess the ecological changes of rangelands. In order to survey of plant indices of rangelands, two exclosure areas (long-term and mid-term) and a grazing area in rangelands of Javaherdeh (Ramsar, Iran) were select...
the crustacean paramysis intermedia is one of the most important zooplanktons which is used as food by aquatic animals in estuaries and marine environments. regarding the existence of this zooplankton stocks in the persian gulf and oman sea, knowledge on genetic structure of this species is necessary for conservation of its biological diversity and gene pool. in present study, genetic diversity...
this study investigated the effect of prior knowledge on the listening comprehension performance of fl learners. twenty students, male and female, drawn from the two intact groups of the senior and junior english language and literature majors were chosen as the participants of this study . the two groups were then randomly assigned into the experimental and control group. the experimental gr...
Biodiversity is one of the important aspects of natursal systems which supports ecosystem functions. Therefore, the preservation of biodiversity is necessary for human well-being. The curreny study aimed to investigate changes of alpha and beta diversity and its components along the elevation gradient of five classes and to evaluate the effects of physical and chemical characteristics of soil o...
Information about gaps and their sizes distribution is useful for protecting herbaceous diversity. This study was conducted to investigate the effect of gap size on herbaceous species diversity in oriental beech (Fagus orientalis Lipsky.) stand in Asalem, Guilan province. For this study, fifteen gaps in small, medium, and large sizes were randomly selected. Then, herbaceous species were ident...
thirty five monoconidial isolates of the fungal culture collection pyricularia grisea were examined, to identify the vegetative compatibility groups and characterize the genetic diversity of isolates as through rep-pcr genomic fingerprinting. the isolates were collected from ricefields during 1997-1999. genetic diversity of p. grisea isolates was studied as based on dna fingerprinting through r...
apricot ( armeniaca vulgaris l.) is a popular and an economically profitable fruit of the temperate zone. various apricot genotypes grow in different areas in iran. the genetic diversity of 30 cultivars and genotypes of iranian apricot and as well, of two foreign cultivars (as control) was studied through morphological attributes and rapd markers. in a first experiment, 21 quantitative and qual...
Wheat (Triticum aestivum L.) is a member of the Poaceae family, an annual and self-pollinated crop which has three groups of 14, 28 and 42 chromosomes with genome formula AA, AABB, AABBDD that the chromosomes are located in three homeologous genomes A, B and D. Wheat has an extremely large genome of 16 × 109 base pairs with more than 80% repetitive DNA and an average of 810 mega base pairs in ...
Landscape features notoriously affect spatial patterns of biodiversity. For instance, in dendritic ecological networks (such as river basins), dendritic connectivity has been proposed to create unique spatial patterns of biodiversity. Here, we compared genetic datasets simulated under a lattice-like, a dendritic and a circular landscape to test the influence of dendritic connectivity on neutral...
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