Author: Michael Gebretsadik Gebre
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
Drought stress significantly limits soybean production in Ontario. Identification of physiological traits to improve drought tolerance in soybean would benefit from controlled-environment phenotyping methods. It was hypothesized that elite Ontario-adapted soybean varieties would differ for drought tolerance. A greenhouse culture system was developed employing 1-m rooting columns filled with amended field soil, that presents field-like volumetric soil water content and rooting profiles by depth. Different levels of drought stress were simulated in this system by restoring soil water to 100% (control), 75% (mild stress) or 50% (drought stress) of the maximum soil water holding capacity by daily weighing and watering from first flower (R1) until maturity. The effect of applying fertilizer throughout the 1-m soil profile instead of confining it to the upper 30 cm was tested. Distributing fertilizer over the entire 1-m rooting depth resulted in deeper rooting and more soil water extraction at depth at the R1 stage; however, these effects did not persist until maturity and so did not affect drought tolerance. Fifteen Ontario-adapted commercial soybean varieties were compared for their drought tolerance, defined as the ratio of their seed yield under drought conditions compared to control conditions (seed yield ratio; SYR). Similar to the effects of drought in the field, pod number was by far the yield component most affected, with effects on seeds per pod and single-seed weight being relatively minor. Based on their SYR, two drought-sensitive varieties (Saska and OAC Drayton) and three drought-tolerant varieties (OAC Lakeview, OAC Champion, and PRO 2715R) were identified. Principal components analysis showed that drought-tolerant varieties were those that maintained relatively high water use, shoot dry matter, and pod number under stress. Varieties differed for root biomass distribution by depth, but not for soil water extraction profiles, and there was no evidence that differences in drought tolerance were associated with rooting traits among these fifteen varieties. This study helps define the physiological basis of soybean variety differences in drought tolerance, and provides novel phenotyping tools for soybean breeders to select for root function and yield formation traits that could improve soybean yield under drought stress.

Author: Jiban Shrestha
Publisher: Frontiers Media SA
ISBN: 2832550924
Category : Science
Languages : en
Pages : 613

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Book Description
Agricultural communities are being affected by climate change. Droughts, heat waves, cold snaps, and flooding are all regarded as severe threats to crop production as they hinder plant growth and development, resulting in yield losses. Plants respond to stress through a complex process that includes changes in physiological and biochemical processes, gene expression, and alterations in the amounts of metabolites and proteins at different developmental stages. This special issue will focus on recent advances in the use of various traditional and modern biotechnological strategies to understand stress adaptation and tolerance mechanisms including (but not limited to) genomics, transcriptomics, metabolomics, proteomics, miRNA, genome editing, transgenic plants, exogenous application of plant growth regulators, and so on. Abiotic stress is a key constraint to agricultural production around the world. Water deficit, excess precipitation, high and low temperature, and salinity are the most prevalent abiotic stresses. Compaction, mineral availability, and pH-related stressors are among the others. This Research Topic aims to highlight the most recent breakthroughs in plant responses to abiotic stresses and adaptation/tolerance strategies. This special issue provides the advanced toolkit and technologies that are used to investigate and understand plant responses to abiotic stress. The purpose of this special issue is to give a platform for scientists and academics from across the world to promote, share, and discuss new concerns and advancements in the field of abiotic stress in plants. Current updates and recent developments in the physiological, molecular, and genetic perspectives on combined and sequential stress responses and tolerance in field crops are expected in articles. Original research and review articles dealing with abiotic stress are welcomed. In this special issue, potential topics include, but are not limited to: • Physiological, biochemical and molecular responses of plants under abiotic stress. • Systems biology approaches to study abiotic stress in crop plants. • Phenotyping for abiotic stress tolerance in crops. • Physiological and molecular characterization of crop tolerance to abiotic stresses. • Molecular breeding for developing and improving abiotic stress resilience in crops. • Microbial mitigation of abiotic stress responses in crops • Omics technologies for abiotic stress tolerance in plants. • Performance of novel GMO crops under abiotic stress conditions. • CRISPR-Cas Genome editing tools for the Improvement of abiotic stress tolerance in plants. • Crop production in abiotic stress conditions.

Author: Sumandeep Kaur Bazzer
Publisher:
ISBN:
Category :
Languages : en
Pages : 430

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Book Description
Soybean (Glycine max L.) is one of the major row crops in the United States, and its production is often limited by drought stress. Physiological traits from exotic germplasm that confer drought tolerance may be useful in improving commercial soybean production. For example, carbon isotope ratio (?13C) is positively correlated with water use efficiency (WUE), and nitrogen isotope ratio (?15N) is negatively correlated with N2 fixation; canopy temperature (CT) is an indicator for genetic variation in transpiration and stomatal conductance. Therefore, the objectives of this research were to identify the genomic regions associated with: (1) ?13C and ?15N using a population of 196 F6-derived recombinant inbred lines (RIL) from PI 416997 × PI 567201D that was phenotyped in four environments, (2) CT and ?13C using a population of 168 F5-derived RILs from KS4895 × Jackson that was phenotyped in multiple environments and irrigation treatments. In the PI 416997 × PI 567201D population, ?13C and ?15N had a wide phenotypic range in all environments, and PI 416997 had higher ?13C and lower ?15N values than PI 567201D. ?13C had high heritability (90%) whereas the heritability of ?15N was relatively lower (35%), indicating that ?15N was more affected by the environment. QTL mapping identified eight loci on seven chromosomes associated with ?13C, and these loci explained between 2.5 to 30% of the phenotypic variation. There were 13 loci on 10 chromosomes associated with ?15N, explaining 1.7 to 14.4% of the phenotypic variation. There were strong interactions between QTLs and environments for ?15N. In the KS4895 × Jackson RIL population, Jackson had a cooler canopy than KS4895, and the heritability of CT had low heritability (31%) across environments. There were 11 loci present on eight chromosomes associated with CT that individually explained 4.6 to 12.3% of the phenotypic variation. The heritability of ?13C in KS4895 × Jackson RIL population heritability was 83% when estimated over environments and over irrigation treatments. A total of 24 QTLs associated with ?13C were identified and clustered in nine genomic loci on seven chromosomes. The identified QTLs for ?13C, ?15N, and CT were co-localized with genomic regions associated with drought tolerance-related traits from previous studies. These genomic regions may be important resources in soybean breeding programs to improve tolerance to drought. Further research is needed to fine map the identified QTLs and validate markers linked with these regions.

Author: Damien Scott White
Publisher:
ISBN:
Category : Soybean
Languages : en
Pages : 306

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Book Description
The improvement of drought tolerance of commercial soybean varieties via indirect selection for transpiration efficiency (TE) in breeding programs was investigated. The extent and nature of variation for TE among soybean genotypes were established through glasshouse experiments under well watered conditions, and confirmed in the field under contrasting water stress conditions. The results suggest that increasing TE will be a beneficial strategy to improve soybean grain yield at the crop level, and a protocol developed suited to indirect selection for high TE soybean genotypes under a range of environments. This will have immediate application in the development of soybean varieties specifically adapted to the dryland production areas of the Australian sub-tropics.

Author: Lynn Liane Scherbert
Publisher:
ISBN:
Category :
Languages : en
Pages : 218

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Book Description

Author: Alison Elizabeth Walden-Coleman
Publisher:
ISBN: 9780494522790
Category :
Languages : en
Pages : 103

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Book Description

Author: Yunru Cao
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 84

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Book Description

Author: B. Venkateswarlu
Publisher: Springer Science & Business Media
ISBN: 9400722206
Category : Technology & Engineering
Languages : en
Pages : 617

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Book Description
Crops experience an assortment of environmental stresses which include abiotic viz., drought, water logging, salinity, extremes of temperature, high variability in radiation, subtle but perceptible changes in atmospheric gases and biotic viz., insects, birds, other pests, weeds, pathogens (viruses and other microbes). The ability to tolerate or adapt and overwinter by effectively countering these stresses is a very multifaceted phenomenon. In addition, the inability to do so which renders the crops susceptible is again the result of various exogenous and endogenous interactions in the ecosystem. Both biotic and abiotic stresses occur at various stages of plant development and frequently more than one stress concurrently affects the crop. Stresses result in both universal and definite effects on plant growth and development. One of the imposing tasks for the crop researchers globally is to distinguish and to diminish effects of these stress factors on the performance of crop plants, especially with respect to yield and quality of harvested products. This is of special significance in view of the impending climate change, with complex consequences for economically profitable and ecologically and environmentally sound global agriculture. The challenge at the hands of the crop scientist in such a scenario is to promote a competitive and multifunctional agriculture, leading to the production of highly nourishing, healthy and secure food and animal feed as well as raw materials for a wide variety of industrial applications. In order to successfully meet this challenge researchers have to understand the various aspects of these stresses in view of the current development from molecules to ecosystems. The book will focus on broad research areas in relation to these stresses which are in the forefront in contemporary crop stress research.

Author: Wilfried Ehlers
Publisher: Cabi
ISBN: 9781780643823
Category : Technology & Engineering
Languages : en
Pages : 0

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Book Description
"Meagre water supply causes severe problems in the growth of plants, which rely on sufficient water transmitted by the soil to meet their needs. This new edition of Water Dynamics in Plant Production describes the basic scientific principles of water transport in the soil-plant-atmosphere continuum, explains the linkage between transpirational water use and dry matter production paying particular attention to the various agronomic strategies for adaptation to climate-driven limitations of water resources"--Publisher's website.

Author: Mohammad Miransari
Publisher: Academic Press
ISBN: 0128017309
Category : Technology & Engineering
Languages : en
Pages : 348

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Book Description
Abiotic and Biotic Stresses in Soybean Production: Soybean Production Volume One presents the important results of research in both field and greenhouse conditions that guide readers to effectively manage the chemical, physical, and biological factors that can put soybean production at risk. Including the latest in genetics, signaling, and biotechnology, the book identifies these types of stresses, their causes, and means of avoiding, then addresses existing stresses to provide a comprehensive overview of key production yield factors. By presenting important insights into the historical and emerging uses for soybean, the book educates readers on the factors for consideration as new uses are developed. It is an ideal complement to volume two, Environmental Stress Conditions in Soybean Production, that work together to provide valuable insights into crop protection. - Presents insights for the successful production of soybean based on chemical, physical and biologic challenges - Includes the latest specifics on soybean properties, growth, and production, including responses to different stresses and their alleviation methods - Offers recent advancements related to the process of N fixation and rhizobium, including signaling pathways and their practical use - Explores the production of rhizobium inoculums at large-scale levels