نتایج جستجو برای: genotypic diversity

تعداد نتایج: 199853  

Journal: :journal of chemical health risks 0
ghanbar laei department of plant breeding, science and research branch , islamic azad university, tehran, iran mohammad reza bihamta department of agronomy, tehran university, tehran, iran reza azizinezhed department of plant breeding, science and research branch , islamic azad university, tehran, iran farokh darvish kojou department of plant breeding, science and research branch , islamic azad university, tehran, iran

this study aimed to examine the relationship between pigments and seed fall rate of iranian castor genotypes and genetic diversity, specifically 28 castor genotypes (27 native and 1 modified), a randomized complete block design with three replications was conducted in 2014 and 2015 at the research farm of islamic azad university in damghan, northern iran. during the growth period, the following...

Journal: :Ecology 2011
Susan C Cook-Patton Scott H McArt Amy L Parachnowitsch Jennifer S Thaler Anurag A Agrawal

Biodiversity loss is proceeding at an unprecedented rate, yet we lack a thorough understanding of the consequences of losing diversity at different scales. While species diversity is known to impact community and ecosystem processes, genotypic diversity is assumed to have relatively smaller effects. Nonetheless, a few recent studies suggest that genotypic diversity may have quantitatively simil...

Journal: :Science 2006
Gregory M Crutsinger Michael D Collins James A Fordyce Zachariah Gompert Chris C Nice Nathan J Sanders

Theory predicts, and recent empirical studies have shown, that the diversity of plant species determines the diversity of associated herbivores and mediates ecosystem processes, such as aboveground net primary productivity (ANPP). However, an often-overlooked component of plant diversity, namely population genotypic diversity, may also have wide-ranging effects on community structure and ecosys...

Journal: :Ecology 2017
Jessica M Abbott Richard K Grosberg Susan L Williams John J Stachowicz

Genetic diversity within key species can play an important role in the functioning of entire communities. However, the extent to which different dimensions of diversity (e.g., the number of genotypes vs. the extent of genetic differentiation among those genotypes) best predicts functioning is unknown and may yield clues into the different mechanisms underlying diversity effects. We explicitly t...

2010
A. Randall Hughes Rebecca J. Best John J. Stachowicz

Despite experimental evidence for effects of primary producer diversity and consumer species diversity on population and community processes, little is known about how diversity at these multiple trophic levels may interact. We conducted a mesocosm experiment to examine the independent and interactive effects of seagrass Zostera marina genotypic diversity and grazer species diversity on seagras...

2009
Armin Bischoff Thomas Steinger Heinz Müller-Schärer

The increased translocation of plant species for biodiversity restoration and habitat creation has provoked a debate on provenance and genotypic diversity of the used plant material. Nonlocal provenances are often not adapted to the local environmental conditions, and low population genotypic diversity may result in genetic bottlenecks hampering successful establishment. We tested provenance di...

2008
Anneli Ehlers Boris Worm Thorsten B. H. Reusch

Effects of global warming on marine ecosystems are far less understood than they are in terrestrial environments. Macrophyte-based coastal ecosystems are particularly vulnerable to global warming, because they often lack species redundancy. We tested whether summer heat waves have negative effects on an ecologically important ecosystem engineer, the eelgrass Zostera marina L., and whether high ...

2016
Susan C. Cook-Patton Amy P. Hastings Anurag A. Agrawal

1. Genotypic diversity in plant populations is known to enhance plant performance and ecosystem function. Nonetheless, the effect of genotypic diversity has rarely been examined across a population’s lifecycle despite the expectation that changing conditions, such as population density, will alter the benefits of diversity. 2. We simultaneously manipulated a component of genotypic diversity (ri...

2016
Geoffrey P Morris Zhenbin Hu Paul P Grabowski Justin O Borevitz Marie-Anne de Graaff R Michael Miller Julie D Jastrow

The perennial grass species that are being developed as biomass feedstock crops harbor extensive genotypic diversity, but the effects of this diversity on biomass production are not well understood. We investigated the effects of genotypic diversity in switchgrass (Panicum virgatum) and big bluestem (Andropogon gerardii) on perennial biomass cropping systems in two experiments conducted over 20...

Journal: :پژوهش های حبوبات ایران 0
مریم خداقلی رقیه همتی بیتا ناصری علیرضا معرفت

bean root rot caused by plant pathogenic fungus, fusarium solani, is considered one of the most important diseases of bean in the world and in iran. because of economic importance of bean and the lack of information on population diversity of the pathogen in zanjan province, a research was conducted to study phenotypic, genotypic and pathogenicity variation of pathogen isolates and to assess pa...

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