Development of drought-tolerant cultivars is hampered by a lack of effective selectioncriteria. In this research, response of 36 genotypes of rapeseed from seven species of Brassicaincluding B. napus, B. rapa, B. juncea, B. carinata, B. oleracea, B. nigra and B. fruticulosa wasassessed under three moisture levels (no stress, mild stress and intense stress) in the field during2011-2012. Five dro...

the diversity and richness of species are of important components to evaluate the health of ecologic system of rangelands. this research was conducted to investigate the biodiversity in riparian and neighboring areas via comparison of indices in javaherdeh rangeland of ramsar. plot-transects was randomly used to estimate diversity, richness, dominance, and evenness indices in two regions. multi...

this study was aimed to assess wheat-grown fields health in gharessoo basin, golestan province, iran, using 79 fields in 8 villages in 2010. the samples were taken by quadrates. the number and the type of weeds were recorded at genera and species levels. in parallel, management data were recorded by questionnaire. species richness was defined as species number and shannon-wiener index, simpson’...

in order to investigate the effects of cattle manure, benefit fungi of trichoderma species and psudomunas spp. bacteria on seedling emergence parameters, growth and yield of wheat (triticum aestivum l.) a pot experiment was carried out in factorial (23) arrangement based on a randomized complete design with three replications. the treatments were three levels of cattle manure (10, 20 and 30 t.h...

calcareous nannofossils in boundary of tirgan and sarcheshmeh formations at qalezo section have been studied. this section is situated in the west of kopet-dagh basin. in this study 35 nannoplankton species of 17 genera were identified. according to the first occurrence of index species and fossil assemblages two calcareous nannofossil biozones (cc7-cc8) of sissingh (1997) have been recognized....

This paper is a comprehensive study of the shrimp trawl by- catch from Bushehr coastal waters (N. Persian Gulf). Sampling operation was carried out in two shrimp fishing seasons using the (Saber and Jahanara) commercial trawlers Generally, 87.5% of the total catch was by-catch and 12.5% was target species (shrimp). The catch composition included: 114 species from 45 teleostei families, 13 speci...

based on the study of brachiopods and conodents a stratigraphic and relative age determination research has been worked out on the paleozoic sediments, located in south of bojnod,northeas of iran.for the first time the sediments of upper ordevician have been recognized in iran, based on some index fossils of brachiopods and conodonts. fourteen species of upper ordovician brachiopods and 12 spec...

this study concerns the cytotaxonomic investigations on twelve species belonging to three sections from the genus vicia in iran. a taxonomic background of the genus is given in brief. the previous counts reported for the genus in index to plant chromosome number are summarized. in addition to one new count, the chromosome numbers of four species are reported for the first time. briefly, the res...