Download or read book Evaluation of Soybean Glycine Max L Merr Lines for Grain Yield and Drought tolerance written by Thubelihle Lungelo Mathonsi and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Soybean Glycine Max L Merr Root Development in Greenhouse Solution Culture and the Relationship to Drought Tolerance in the Field written by Lynn Liane Scherbert and published by . This book was released on 1985 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Potential for Improving the Drought Resistance of Soybean Glycine Max L Merr Using the Transpiration Efficiency Trait written by Damien Scott White and published by . This book was released on 1998 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Genetic Variability for Drought Tolerance and Agronomic Traits Contributing to Seed Yield in Soybean Glycine Max L Merrill written by N. P. Arunakumar and published by . This book was released on 2008 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Soybean Glycine Max L Merrill Lines and Cultivars for Use in Narrow row Culture written by Ghizan Bin Saleh and published by . This book was released on 1983 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation and Genetic Analysis of Two Soybean Glycine Max L Merr Recombinant Inbred Line Populations Segregating for Resistance to Root Knot Nematode Meloidogyne Incognita written by Drew Wright and published by . This book was released on 2012 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most economically important pathogens of US soybeans is the Southern Root Knot Nematode [(Meloidogyne incognita ) (Kofoid and White) Chitwood] (Mi). Evaluation and identification of resistance is highly important to the plant breeding program at SIUC. The main objective of this study was to screen within the greenhouse two F5:7 recombinant inbred line (RIL) (n =96) from crosses between LS90-1920 or LS97-1610 (resistant parents) with 'Spencer' (susceptible parent) to identify sources of resistance for Mi. Additionally, the RILs were evaluated in two locations in southern Illinois (Harrisburg and Dowell) in 2011 for several agronomic characteristics including yield performance. The phenotypic data collected from field and greenhouse experiments was used to select for superior lines within the two populations. The screening data was also used to identify single nucleotide polymorphism (SNP) markers associated with Mi resistance. Initial screening of the 5,361 SNP markers indicated four SNP markers (ss247062763, ss247064854, ss247077423 and ss247067293) highly associated with resistance to Mi. The results will help accelerating selection practices, and have provided high yielding resistant lines for the creation of resistant commercial varieties.
Download or read book High Throughput Phenotypic Evaluation of Drought related Traits in Soybean written by Hua Bai and published by . This book was released on 2016 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drought limits crop growth and yield in soybean. Rapid and effective methods of screening large numbers of soybean lines for drought tolerance are urgently needed. Two experiments were conducted to evaluate the effects of drought in soybean during reproductive stages. In the first experiment five genotypes from maturity groups 2 through 5 were tested under well-irrigated and drought conditions. Beginning at R5, leaf samples were taken for nitrogen concentration analysis. Pictures were taken across the top of each plot to determine the intensity of greenness using the Dark Green Color Index (DGCI). Aerial photographs were also taken to determine aerial DGCI values. Leaf nitrogen concentration decreased as plants approached maturity and was closely related to ground DGCI. Additionally, ground DGCI and aerial DGCI values followed similar trends. The aerial DGCI measurements had advantages over ground DGCI measurements in that it allowed discernment between both water treatments. This opens up the possibility of using aerial DGCI to screen genotypes that senesce more slowly under drought. In the second experiment, the effects of drought in soybean were evaluated by aerial infrared image analysis, carbon isotope discrimination (Delta 13C) and oxygen isotope composition (delta 18O). Five fast-and five slow-wilting genotypes derived from a cross of Benning × PI416937 were evaluated under three water treatments that included a full and two deficit-irrigation treatments of increasing severity (deficit 1, and 2). After canopy closure, aerial infrared images were taken to determine the relative canopy temperature. Soybean leaves sampled at late R5 and seed at harvest were collected to measure Delta 13C (leaf and seed) and delta 18O (seed) as surrogate measurements for water use efficiency (WUE) and transpiration, respectively. As water availability decreased, the Delta 13C values from leaf and seed generally decreased (i.e., higher WUE). In contrast, the delta 18O values and relative canopy temperature generally increased with increasing drought stress. Moreover, slow-wilting genotypes generally had lower Delta 13C, delta 18O and canopy temperature than fast-wilting genotypes. However, delta 18O values were not consistent over years. The results from these two experiments indicate that the determination of DGCI, Delta 13C, and canopy temperature were promising tools for rapid characterization of drought-related traits in soybean.
Download or read book Grain Yield Stability Genetic Gain and Path Coefficient Analyses in Advanced Soybean Glycine Max L Merr Lines written by Chibanda Mwila and published by . This book was released on 2017 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Screening of Germplasm for Drought Tolerance and Formulation of Selection Indices for Seed Yield in Soybean Glycine Max L Merrill written by KRISHANAN V and published by . This book was released on 1991 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigations Into Using Vegetative Indices in Soybean Breeding written by Randi R. Clark and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Yield in soybean (Glycine max (L.) Merr) needs to dramatically increase across the world to feed the growing population. Remote sensing and high-throughput phenotyping may provide a tool to better phenotype soybean genotypes. This research was conducted to: 1) examine the relationships between NDVI and CT with seed yield, maturity, lodging, and height, 2) determine if the time of day and growth stage have an effect on the spectral readings, 3) examine the relationships between spectral reflectance and traits associated with drought tolerance, and 4) evaluate how weather variables impact the ability of vegetative indices and canopy temperature to detect differences among genotypes. Ninety genotypes from the mapping population derived from the cross between KS4895 x Jackson were evaluated in Manhattan, KS, in 2013 and in McCune, Pittsburg, and Salina, KS in 2014. Genotypes were planted in a randomized complete bloc design in four-row, 3.4m long plots spaced 76 cm apart. Plant height, lodging, maturity and seed yield was collected on the center two rows of each plot. Spectral readings used to calculate a normalized differential vegetative index (NDVI) and canopy temperature (CT) were taken during reproductive growth. Nitrogen fixation trait and drought tolerance data was collected by the University of Arkansas. This population exhibited a substantial genetic variation for all traits evaluated. Correlations of NDVI and CT entry means with the agronomic traits were small and inconsistent. Time of day and growth stage were not important in differentiating genotypes. Differences in NDVI and CT did account for some genetic variation in drought tolerance traits, however, the strength of the associations were small. None of the weather variables were consistently associated with an increase or decrease in entry or error variance across the four environments. Stronger associations need to be established to use NDVI or CT to characterize differences in genotypes in a plant breeding program.
Download or read book Genotype by Environment Interaction Genetic Variability and Path Analysis for Grain Yield in Elite Soybean glycine Max L Merrill Lines written by Bubala Mwiinga and published by . This book was released on 2018 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Testcross Evaluation of Soybean Glycine Max L Merr Lines written by Mohammad Aslam and published by . This book was released on 1984 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High versus Low stress Yield Test Environments for Selecting Superior Soybean Glycine Max L Merr Lines written by Wayne Francis Whitehead and published by . This book was released on 1988 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of the Rotational Influence and Nitrogen Contribution of Soybean Glycine Max L Merr to Subsequent Crops written by Timothy S. Maloney and published by . This book was released on 1995 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetics of Physiological Traits Associated with Drought Tolerance in Soybean glycine Max written by Sumandeep Kaur Bazzer and published by . This book was released on 2020 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Selection of Drought tolerant Soybean Lines Using a Field Screening Method and Identification of QTLs for Slow Wilting and Nitrogen Fixation Associated with Drought tolerance written by Mirta Beatriz Dalzotto and published by . This book was released on 2016 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drought causes significant yield reductions in soybean. The development of drought-tolerant cultivars is an effective alternative to overcome this abiotic stress. Slow wilting, prolonged nitrogen fixation, and minimal yield reduction under water stress play an important role in evaluating breeding materials. Despite advances in knowledge about plant responses to drought conditions, there is little information on effective methodologies for phenotype screening in the field, and some QTLs have been identified for drought tolerance. Field screenings under drought and irrigated conditions are necessary to detect drought tolerant lines. In addition, QTLs and molecular makers associated with drought tolerance traits will greatly facilitate the development of tolerant lines through marker-assisted selection (MAS). The objectives of this study were: 1) to evaluate whether selection of high-yielding lines under irrigation in the preliminary stage is a positive predictor of the performance of these lines under drought conditions, and 2) to identify/confirm QTLs associated with slow wilting and nitrogen fixation for drought tolerance. For the first objective, yield performances of 87 genotypes derived from three different populations were evaluated under rain-fed conditions versus standard irrigation. The second objective was to identify QTLs associated with slow wilting, shoot ureides and nitrogen concentrations in soybeans. For this objective, 148 lines from an F4-derived population (R07-7044 x R01-581) were screened with SNP markers and molecular analysis was conducted. Results for the first project showed four different types of yield performance on the lines. The high-yielding lines under full irrigation also had high yields under drought indicating that the selection of high-yielding lines in initial stages under irrigation is a good indicator of the profitable yielding lines under moderate drought conditions. In the second project, results showed two new QTLs for shoot nitrogen on chromosomes 6 and 11, and confirmed two shoot ureide QTLs on chromosomes 10 and 13. Four new QTLs for wilting were identified on chromosomes 11, 13, 14, and 18. These newly confirmed QTLs and molecular markers will be useful for marker-assisted selection for drought tolerance improvement in a soybean breeding program.
Download or read book Feasibility of Breeding Soybean Glycine Max L Merr for High Weed Suppressive Ability written by Jean-Luc Jannink and published by . This book was released on 1999 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
