Download or read book Estimation of the Genetic Diversity in Wheat Triticum Aestivum L Regarding Mycorrhization of Roots and Its Impact on Drought Stress Tolerance written by Heike Lehnert and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Diversity for Drought Resistance in Wheat written by Anila Afridi and published by LAP Lambert Academic Publishing. This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The genus Triticum includes bread (Triticum aestivum) and durum wheat (Triticum durum) and constitutes a major source for human food consumption. Drought is currently the leading threat on world's food supply, limiting crop yield, and is complicated since drought tolerance is a quantitative trait with a complex phenotype affected by the plant's developmental stage. Drought tolerance is crucial to stabilize and increase food production since domestication has limited the genetic diversity of crops including wild wheat, leading to cultivated species, adapted to artificial environments, and lost tolerance to drought stress.

Download or read book Association Mapping of Root Traits for Drought Tolerance in Bread Wheat written by Israr Ahmad and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Bread wheat (Triticum aestivum L., 2n = 6x = 42, AABBDD) is one of the most important crops, making staple food for more than 40 countries and over 35% of the global population. Drought stress is among the major constraints to wheat production as it affects plant growth, gene expression and yield potential of the crop. Development of elite wheat cultivars with the ability to grow and reproduce in water-limited soils seems to be the most enduring solution of addressing drought stress. A total of 100 lines including well-adapted wheat cultivars were evaluated for important root traits and complemented with 102 PCR-based markers aiming to understand their genetic structure and to identify molecular markers that are closely associated to quantitative trait loci (QTLs) of important root traits. Alleles per locus are counted and polymorphic information content (PIC) values are calculated. Population structure of these lines was analyzed with general linear model (GLM) and mixed linear model (MLM) approaches for identification of QTLs associated with important root traits. The results indicated the presence of two novel QTLs on the homoeologous group 2 and group 5 of wheat that may be related to drought stress resistance. Our results may facilitate the development of agronomically desirable drought stress-resistant wheat germplasm.

Download or read book Drought Stress Tolerance in Plants Vol 1 written by Mohammad Anwar Hossain and published by Springer. This book was released on 2016-05-25 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abiotic stress adversely affects crop production worldwide, decreasing average yields for most of the crops to 50%. Among various abiotic stresses affecting agricultural production, drought stress is considered to be the main source of yield reduction around the globe. Due to an increasing world population, drought stress will lead to a serious food shortage by 2050. The situation may become worse due to predicated global climate change that may multiply the frequency and duration and severity of such abiotic stresses. Hence, there is an urgent need to improve our understanding on complex mechanisms of drought stress tolerance and to develop modern varieties that are more resilient to drought stress. Identification of the potential novel genes responsible for drought tolerance in crop plants will contribute to understanding the molecular mechanism of crop responses to drought stress. The discovery of novel genes, the analysis of their expression patterns in response to drought stress, and the determination of their potential functions in drought stress adaptation will provide the basis of effective engineering strategies to enhance crop drought stress tolerance. Although the in-depth water stress tolerance mechanisms is still unclear, it can be to some extent explained on the basis of ion homeostasis mediated by stress adaptation effectors, toxic radical scavenging, osmolyte biosynthesis, water transport, and long distance signaling response coordination. Importantly, complete elucidation of the physiological, biochemical, and molecular mechanisms for drought stress, perception, transduction, and tolerance is still a challenge to the plant biologists. The findings presented in volume 1 call attention to the physiological and biochemical modalities of drought stress that influence crop productivity, whereas volume 2 summarizes our current understanding on the molecular and genetic mechanisms of drought stress resistance in plants.

Download or read book Genetic Diversity Analysis in Spring Wheat Triticum Aestivum L written by Deepak K.R. Baranwal and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a reference book which describes importance, use and basic information relevant to Wheat and its improvement. In reference to genetic diversity analysis, data was collected for yield and its components and utilized for genetic evaluation of diverse wheat genotypes. The analysis revealed high significant genetic variation for most of the yield components. Recent research findings in wheat improvement aspects have been incorporated in the book. The present research would be fruitful during formulating breeding strategies for wheat improvement. Methodology, experimental findings and their relation with earlier researches has been elaborated in the book. Thousand grain weight, plot yield, grains per spike, tiller per meter and ear length are found key traits for genetic evaluation of wheat genotypes and should be utilized in wheat breeding programmes. Genetic diversity analysis using Cluster and principal component analysis has explored an opportunity to identify diversified genotypes for crop improvement.Present book is basically written for Plant Breeding Scholar and persons interested in Wheat research.

Download or read book Exploring Plant Rhizosphere Phyllosphere and Endosphere Microbial Communities to Improve the Management of Polluted Sites written by Michel Chalot and published by Frontiers Media SA. This book was released on 2022-01-11 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mycorrhizosphere Communication Mycorrhizal Fungi and Endophytic Fungus Plant Interactions written by Erika Kothe and published by Frontiers Media SA. This book was released on 2019-02-19 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: The specific interactions of fungi with plants include the mutually beneficial mycorrhizal symbioses and an increasing number of case studies, where endophytic fungi communicate with their host plant to allow for beneficial interactions. The omics methods development has allowed for a substantial increase in knowledge that emphasized in many cases the intricate interplay between the symbiotic partners. In addition to the direct interactions, the mycorrhizosphere comes into view, as the fungal soil mycelium is interacting with the community outside the host plant, transferring signals also to the host. This Research Topic encompasses research on both major types of mycorrhizal interactions, endo- and ectomycorrhiza, and includes communication with the environment in which both partners interact with soil microbes. The mycorrhizosphere is in the center of molecular biology and modern ecological research, greatly fostered by the possibilities of genetic manipulation.

Download or read book Identifying Novel Disease Resistance and Drought Tolerance Genes in a Synthetic NAM Population written by Nikayla Strauss and published by . This book was released on 2021 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wheat was domesticated approximately 10,000 years ago when the tetraploid grass Triticum turgidum (AABB) is thought to have hybridized with the diploid grass Aegilops tauschii Coss. (DD), resulting in hexaploid wheat Triticum aestivum (AABBDD). Most research confirms the D-genome was the last genome to be introduced, is the least diverse, and tends to have fewer known markers. This distinct lack of diversity has hindered breeders and geneticists; diversity could lead to higher yields, better end-use quality, and increased tolerance to biotic and abiotic stress. Synthetic wheat is a tool that can be used to incorporate genetic diversity and provide disease resistance genes not found in common germplasm. Synthetic wheat is made by recreating the hybridization that led to T. aestivum using different subspecies of both T. durum and Ae. tauschii. The result is a primary synthetic hexaploid wheat (AABBDD) that has diverse alleles and trait combinations, and can be readily crossed into adapted germplasm. In addition to being a source of novel disease resistance genes, synthetic wheat lines are also known to have more diverse root systems. The objective of this dissertation was to evaluate a synthetic nested association mapping population, the D-genome Nested Association Mapping Population (DNAM) for novel abiotic and biotic stress tolerance genes. Multiple projects involved screening selections of the DNAM population for resistance to stripe rust (Puccinia striiformis), Fusarium crown rot (Fusarium culmorum and Fusarium pseudograminearum), and cereal cyst nematode (Heterodera avenae and Heterodera filipjevi). One novel gene was found to confer resistance to both H. filipjevi and avenae cereal cyst nematodes. Moderate resistance to fusarium crown rot was also detected, but is contributed both from the recurrent parent of the population as well as by several A. tauschii donor parents. A subset of the DNAM was also used for a three-year, nine environment drought study. A genome-wide association study (GWAS) revealed three quantitative trait loci (QTL) for grain protein concentration and quality across all nine environments, and nine QTL contributing to those same traits within individual environments.

Download or read book A Genetic Dissection of Drought and Heat Tolerance Related Traits in Bread Wheat Triticum Aestivum L written by Dion Bennett and published by . This book was released on 2012 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was conducted with the aim of improving our understanding of the genetic basis of the superior grain yield of an elite bread wheat breeding line, RAC875, under drought and heat stressed Mediterranean-type climates in southern Australia. Here, these abiotic stresses present a significant barrier to production. Kukri is a locally adapted variety which achieves acceptable grain yield under more favourable conditions, but relatively low grain yields under severe stress. A cross between the two lines resulted in an F1 derived doubled haploid population consisting of 368 individuals. The population was initially used for the genetic dissection of time to ear emergence and flag leaf glaucousness, with the latter trait hypothesised to explain a significant proportion of RAC875's relative drought and heat tolerance. Whilst parents of the population achieved similar time to ear emergence, segregation for Ppd-B1 and Ppd-D1a created large variation for this trait within the population. Two novel minor loci were detected for time to ear emergence (Q.Eet.aww-1A and Q.Zad.aww-4A), in addition to another eight known, minor loci. Five novel loci were detected for flag leaf glaucousness (Q.W.aww-3A, Q.W.aww-3B, Q.W.aww-3D, Q.W.aww-4D and Q.W.aww-5B), with one in particular (Q.W.aww-3A) accounting for up to 52 percent of the genetic variance for this trait. Sixteen field experiments were sown across southern Australia between 2006 and 2010, where average site grain yields ranged from 314 to 5275 kg ha−1. Kernels per square metre was the trait most correlated with grain yield, while spikelet fertility, which had a significant positive correlation with grains per square metre in all experiments and the subsequently derived environment clusters, was also related to grain yield. Nine loci were detected for grain yield independent of time to ear emergence and plant height. Five of these loci co-located with loci for kernels per square metre and only one of these nine loci were associated with any of the loci for flag leaf glaucousness and this genetic effect was opposite (i.e. Kukri allele resulting in large glaucousness value and lower grain yield). The RAC875 allele at QTL on chromosomes 1B and 7A (Q.Yld.aww-1B and Q.Yld.aww-7A-2) was associated with greater grain yield, kernels per spikelet and kernels per square metre. These two loci were detected in environment clusters where heat stress was a differentiating factor and it was concluded that these may therefore be associated with heat stress tolerance. Another QTL of large effect was consistently detected on chromosome 6A (Q.Tkw.aww-6A), with the RAC875 allele positively affecting grain size, flag leaf width and stem water soluble carbohydrate content but resulting in lower kernels per spikelet and therefore kernels per square metre. Experiments were also sown to assess the performance of the population in north-west Mexico under well watered, high yield potential conditions, as well as drip irrigated drought treatment and late planted but well watered conditions to expose the experiments to heat stress. This resulted in three very distinctive treatments and subsequently detected different genetic regions controlling grain yield. Two distinct QTL were detected for grain yield and canopy temperature on chromosome 3B, under irrigated (Q.Yld.aww-3B-1) and irrigated, drought and heat stressed treatments (Q.Yld.aww-3B-2). The latter QTL accounted for up to 22 percent of the genetic variance for grain yield and 20 percent of the genetic variance for canopy temperature under the heat stress treatment. However, all three treatments failed to detect any major QTL of common effect to southern Australia. This study highlighted the complex genetic basis of grain yield and physical grain quality in drought and heat stressed conditions, as well as the importance of conducting QTL dissection in the target environment. However, key loci detected offer potential for marker development and deployment of marker assisted selection within wheat breeding programmes targeting southern Australia. In the longer term, this should help improve the rate of genetic gain for grain yield, increasing production by growers in the Mediterranean type climate of southern Australia.

Download or read book Bibliography of Agriculture written by and published by . This book was released on 1999 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plant Microbe Symbiosis written by Ajit Varma and published by Springer Nature. This book was released on 2020-04-01 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overview of the latest advances concerning symbiotic relationships between plants and microbes, and their applications in plant productivity and agricultural sustainability. Symbiosis is a living phenomenon including dynamic variations in the genome, metabolism and signaling network, and adopting a multidirectional perspective on their interactions is required when studying symbiotic organisms. Although various plant-microbe symbiotic systems are covered in this book, it especially focuses on arbuscular mycorrhiza (AM) symbiosis and root nodule symbiosis, the two most prevalent systems. AM symbiosis involves the most extensive interaction between plants and microbes, in the context of phylogeny and ecology. As more than 90% of all known species of plants have the potential to form mycorrhizal associations, the productivity and species composition, as well as the diversity of natural ecosystems, are frequently dependent upon the presence and activity of mycorrhizas. In turn, root nodule symbiosis includes morphogenesis and is formed by communication between plants and nitrogen-fixing bacteria. The biotechnological application of plant–microbe symbiosis is expected to foster the production of agricultural and horticultural products while maintaining ecologically and economically sustainable production systems. Designed as a hands-on guide, this book offers an essential resource for researchers and students in the areas of agri-biotechnology, soil biology and fungal biology.

Download or read book Arbuscular Mycorrhizas and Stress Tolerance of Plants written by Qiang-Sheng Wu and published by Springer. This book was released on 2017-04-07 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the potential mechanisms in arbuscular mycorrhizas (AMs), in the hope that this can help arbuscular mycorrhizal fungi (AMF) to be more used efficiently as a biostimulant to enhance stress tolerance in the host plants. AMF, as well as plants, are often exposed to all or many of the abiotic and biotic stresses, including extreme temperatures, pH, drought, water-logging, toxic metals and soil pathogens. Studies have indicated a quick response to these stresses involving several mechanisms, such as root morphological modification, reactive oxygen species change, osmotic adjustment, direct absorption of water by extraradical hyphae, up-regulated expression of relevant stressed genes, glomalin-related soil protein release, etc. The underlying complex, multi-dimensional strategy is involved in morphological, physiological, biochemical, and molecular processes. The AMF responses are often associated with homeostatic regulation of the internal and external environment, and are therefore critical for plant health, survival and restoration in native ecosystems and good soil structure.

Download or read book Root Ecology written by Hans de Kroon and published by Springer Science & Business Media. This book was released on 2003-05-21 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the course of evolution, a great variety of root systems have learned to overcome the many physical, biochemical and biological problems brought about by soil. This development has made them a fascinating object of scientific study. This volume gives an overview of how roots have adapted to the soil environment and which roles they play in the soil ecosystem. The text describes the form and function of roots, their temporal and spatial distribution, and their turnover rate in various ecosystems. Subsequently, a physiological background is provided for basic functions, such as carbon acquisition, water and solute movement, and for their responses to three major abiotic stresses, i.e. hard soil structure, drought and flooding. The volume concludes with the interactions of roots with other organisms of the complex soil ecosystem, including symbiosis, competition, and the function of roots as a food source.

Download or read book Abiotic Stress Mediated Sensing and Signaling in Plants An Omics Perspective written by Sajad Majeed Zargar and published by Springer. This book was released on 2018-02-20 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: The natural environment for plants is composed of a complex set of abiotic and biotic stresses; plant responses to these stresses are equally complex. Systems biology allows us to identify regulatory hubs in complex networks. It also examines the molecular “parts” (transcripts, proteins and metabolites) of an organism and attempts to combine them into functional networks or models that effectively describe and predict the dynamic activities of that organism in different environments. This book focuses on research advances regarding plant responses to abiotic stresses, from the physiological level to the molecular level. It highlights new insights gained from the integration of omics datasets and identifies remaining gaps in our knowledge, outlining additional focus areas for future crop improvement research. Plants have evolved a wide range of mechanisms for coping with various abiotic stresses. In many crop plants, the molecular mechanisms involved in a single type of stress tolerance have since been identified; however, in order to arrive at a holistic understanding of major and common events concerning abiotic stresses, the signaling pathways involved must also be elucidated. To date several molecules, like transcription factors and kinases, have been identified as promising candidates that are involved in crosstalk between stress signalling pathways. However, there is a need to better understand the tolerance mechanisms for different abiotic stresses by thoroughly grasping the signalling and sensing mechanisms involved. Accordingly, this book covers a range of topics, including the impacts of different abiotic stresses on plants, the molecular mechanisms leading to tolerance for different abiotic stresses, signaling cascades revealing cross-talk among various abiotic stresses, and elucidation of major candidate molecules that may provide abiotic stress tolerance in plants.

Download or read book Arbuscular Mycorrhizal Fungi in Sustainable Agriculture Inoculum Production and Application written by Manoj Parihar and published by Springer Nature. This book was released on 2024 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zusammenfassung: This 2-volume book is an up-to-date overview of current progress in Arbuscular Mycorrhizal Fungal (AMF) technique development, inoculum production and its quality regulations, application in agriculture, horticulture, agroforestry, and other ecosystems, along with nutrient management for sustainable food production. It contains the current advancement in basic and molecular techniques, challenges, opportunities, and determinates of various AMF production methods and major tools and techniques for their field application. Production and development of AMF is rapidly evolving and requires a multidisciplinary approach with up-to-date knowledge to broaden and strengthen the perspective of researchers involved in this domain. The volumes offer new insight and cutting-edge information for novices and experts such as students, academicians, researchers, environmentalists, industrialists, and others interested in mycorrhiza. The first volume covers some basic isolation techniques, enumeration, and molecular studies with recent advances in various in-vitro and in-vivo production technologies, regulatory issues, and application methodologies for field inoculation. It also discusses AMF application in various agroecosystems for sustainable agricultural production and a healthier planet

Download or read book Mycorrhizae Sustainable Agriculture and Forestry written by Zaki Anwar Siddiqui and published by Springer Science & Business Media. This book was released on 2008-07-27 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mycorrhizal fungi are microbial engines which improve plant vigor and soil quality. They play a crucial role in plant nutrient uptake, water relations, ecosystem establishment, plant diversity, and the productivity of plants. Scientific research involves multidisciplinary approaches to understand the adaptation of mycorrhizae to the rhizosphere, mechanism of root colonization, effect on plant physiology and growth, biofertilization, plant resistance and biocontrol of plant pathogens. This book discusses and goes into detail on a number of topics: the molecular basis of nutrient exchange between arbuscular mycorrhizal (AM) fungi and host plants; the role of AM fungi in disease protection, alleviation of soil stresses and increasing grain production; interactions of AM fungi and beneficial saprophytic mycoflora in terms of plant growth promotion; the role of AM fungi in the restoration of native ecosystems; indirect contributions of AM fungi and soil aggregation to plant growth and mycorrhizosphere effect of multitrophic interaction; the mechanisms by which mycorrhizas change a disturbed ecosystem into productive land; the importance of reinstallation of mycorrhizal systems in the rhizosphere is emphasized and their impact on landscape regeneration, and in bioremediation of contaminated soils; Ectomycorrhizae (ECM) and their importance in forest ecosystems and associations of ECM in tropical rain forests function to maintain tropical monodominance; in vitro mycorrhization of micro-propagated plants, and visualizing and quantifying endorhizal fungi; the use of mycorrhizae, mainly AM and ECM, for sustainable agriculture and forestry.

Download or read book Genomics of Soil and Plant Associated Fungi written by Benjamin A. Horwitz and published by Springer Science & Business Media. This book was released on 2013-08-30 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume addresses the similarities and also the differences in the genomes of soil saprophytes, symbionts, and plant pathogens by using examples of fungal species to illustrate particular principles. It analyzes how the specific interactions with the hosts and the influence of the environment may have shaped genome evolution. The relevance of fungal genetic research and biotechnological applications is shown for areas such as plant pathogenesis, biomass degradation, litter decomposition, nitrogen assimilation, antibiotic production, mycoparasitism, energy, ecology, and also for soil fungi turning to human pathogens. In addition to the model organisms Neurospora and Aspergillus, the following species are covered providing a view of pathogens and mutualists: Trichoderma, Fusarium oxysporum, Cochliobolus heterostrophus, Penicillium chrysogenum, Rhizopus oryzae, Podospora anserina, and species belonging to Agaricomycetes, Archaeorhizomycetes and Magnaporthaceae. Ecology and potential applications have guided the choice of fungal genes to be studied and it will be fascinating to follow the trends of future sequencing projects.