Evaluation of cowpea (Vigna unguiculata (L.) Walp.) germplasm lines for tolerance to drought

2012 ◽  
Vol 10 (3) ◽  
pp. 171-176 ◽  
Author(s):  
Christian A. Fatokun ◽  
Ousmane Boukar ◽  
Satoru Muranaka
Keyword(s):  
Drought Tolerance ◽  
Sub Saharan Africa ◽  
Grain Legume ◽  
International Institute ◽  
Breeding Lines ◽  
Germplasm Collections ◽  
Legume Crop ◽  
Drought Tolerant ◽  
Cowpea Varieties ◽  
Sub Saharan

Cowpea is an important grain legume crop in sub-Saharan Africa (SSA) where, on a worldwide basis, the bulk is produced and consumed. The dry savanna area of SSA is where cowpea is mostly grown under rain-fed conditions. The crop is therefore prone to drought which may occur early, mid and/or late in the cropping season. Compared with many other crops, cowpea is drought tolerant, even though drought is still a major constraint limiting its productivity in SSA. Increasing the level of drought tolerance in existing cowpea varieties grown by farmers would enable them to obtain more and stable yield from their cowpea fields. As a first step towards enhancing drought tolerance in existing cowpea varieties, 1288 lines were selected randomly from cowpea germplasm collections maintained at the International Institute of Tropical Agriculture, and evaluated for their drought tolerance at Ibadan. Drought was imposed by withdrawal of irrigation from 5 weeks after sowing. On average, drought reduced the number of days to flower by 12 d, and the mean grain yield per plant was also reduced by 67.28%. A few of the cowpea lines stayed green for up to 6 weeks after irrigation was stopped, even though some of these produced no pods when the study was terminated. Further evaluation in the screenhouse of 142 selected drought-tolerant lines helped to identify six lines that could be potential parents for developing breeding lines with enhanced drought tolerance.

scholarly journals Genetic Variability for Flowering Time, Maturity and Drought Tolerance in Cowpea [Vigna unguiculata (L.) Walp.]: A Review Paper

2019 ◽  
pp. 1-18 ◽  
Author(s):  
M. S. Alidu
Keyword(s):  
Genetic Variability ◽  
Drought Tolerance ◽  
English Language ◽  
Critical Role ◽  
Research Work ◽  
Sub Saharan Africa ◽  
International Institute ◽  
Plant Genetics ◽  
Open Access Journals ◽  
Sub Saharan

Background: Cowpea plays a critical role in the lives of millions of people in Africa and other parts of the developing world, where it is a major source of dietary protein that nutritionally complements staple low-protein cereal and tuber crops. It is a valuable and dependable commodity that produces income for farmers and traders. Objective: To review related research work on the genetic variability for time to flowering, maturity and drought tolerance in cowpea. Data Source: Searches were made from the following databases and archives; International Institute of Tropical Agriculture (IITA), The Essential Electronic Agricultural Library (TEAL), Access to Global Online Research in Agriculture (AGORA) (FAO), AGRICOLA (National Agricultural Library), AGRIS - Agricultural Sciences and Technology (FAO), CAS - Chemical Abstracts (ACS), DOAJ - Directory of Open Access Journals, CABI, Euphytica, Elsevier, Research Alert, Scopus and CGIAR, Plant Genetics and Breeding Database, Crop Science Database, Plant Genetics and Breeding Database, data base repositories, using the terms “genetic variability”, “drought”, “tolerance”, “ time to flowering and maturity”, and “cowpea” individually or in combination to identify literature published in English language between January 1990 to January 2018. Methods: The review was carried out using the above search terms. Research papers were critically reviewed, relevant data extracted, and a narrative synthesis was conducted to determine the relevant papers. Results: In all 150 papers met the inclusion criteria. Collections were from varied background; Sub-Saharan Africa, Asia, Europe, and Latin Americas. Conclusion: Despite research studies on cowpea and drought, there appears to be limited such research findings on the time to flowering, and maturity in relations to drought tolerance in cowpea in Ghana, suggesting more research in this part of the world.

scholarly journals Screening the USDA Watermelon Germplasm Collection for Drought Tolerance at the Seedling Stage

HortScience ◽  
2011 ◽  
Vol 46 (9) ◽  
pp. 1245-1248 ◽  
Author(s):  
Haiying Zhang ◽  
Guoyi Gong ◽  
Shaogui Guo ◽  
Yi Ren ◽  
Yong Xu ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Clustering Analysis ◽  
Growth And Development ◽  
Citrullus Lanatus ◽  
Germplasm Collection ◽  
Normal Growth ◽  
Seedling Stage ◽  
Breeding Lines ◽  
Germplasm Collections ◽  
Drought Tolerant

Because of the growing threat of global warming, drought stress could severely affect the normal growth and development of crop plants. To alleviate such an adverse effect, there is a need to screen watermelon germplasm collections to identify genetic sources for potential drought tolerance. In the present study, 820 accessions of USDA's Citrullus PIs and 246 watermelon breeding lines were evaluated for their drought tolerance at the seedling stage under extreme water stress conditions in a greenhouse. Significant variations in drought tolerance were observed in the Citrullus germplasm collections. Using fast clustering analysis, the tested watermelon materials could be assigned into four groups, including tolerant, intermediate tolerant, moderately sensitive, and sensitive, respectively. The most drought-tolerant Citrullus germplasm, including 13 Citrullus lanatus var. lanatus and 12 C. lanatus var. citroides accessions, were originated from Africa. These genetic materials could be used for rootstock breeding or for developing drought-tolerant watermelon cultivars.

Root-based Responses of Well-watered and Water-stressed Chickpea (Cicer arietinum L.) Genotypes Varying for Drought Tolerance and Biomass 

2021 ◽  
Author(s):  
Hayati Akman
Keyword(s):  
Drought Tolerance ◽  
Cicer Arietinum ◽  
Root Biomass ◽  
Root Traits ◽  
Grain Legume ◽  
Breeding Programs ◽  
Cicer Arietinum L ◽  
Legume Crop ◽  
Drought Tolerant ◽  
Adaptation Mechanisms

Background: Chickpea is a pivotal grain legume crop and is grown in rain-fed conditions where its production has been challenged by drought. Methods: To understand precisely the root-based responses to well-watered (WW) and water-stressed (WS) treatments, 14 chickpea (Cicer arietinum L.) genotypes differing in drought tolerance and biomass were studied in 100-cm cylinders under glasshouse conditions. Result: The genotypes exhibited significant variations in rooting depths ranging from 84.5 to 100.3 cm and 78.7 to 121 cm in WW and WS treatments, respectively and root biomasses varied from 0.23 to 1.01 g and 0.38 to 0.91 g. The average root biomass of drought-tolerant genotypes was 61.3% in WS treatment and 64.4% in WW treatment higher than that of drought-sensitive genotypes. Moreover, genotype with high biomass revealed greater root biomass and deeper rooting than the genotype with low biomass in both treatments. The root biomass in the deeper soil profile differed between drought-tolerant and drought-sensitive genotypes and was generally greater in WS compared to WW treatment. Overall, screening the variability in root features of chickpea genotypes with varying levels of drought tolerance and biomass contributes to new insights for understanding drought adaptation mechanisms and the improvement of new cultivars with superior root traits in breeding programs. 

scholarly journals Drought Tolerance and Application of Marker-Assisted Selection in Sorghum

Biology ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1249
Author(s):  
Andekelile Mwamahonje ◽  
John Saviour Yaw Eleblu ◽  
Kwadwo Ofori ◽  
Santosh Deshpande ◽  
Tileye Feyissa ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Qtl Mapping ◽  
Marker Assisted Selection ◽  
Sub Saharan Africa ◽  
Stay Green ◽  
Qtl Pyramiding ◽  
Drought Tolerant ◽  
Sub Saharan ◽  
Food And Nutritional Security ◽  
Marker Assisted Backcrossing

Sorghum is an important staple food crop in drought prone areas of Sub-Saharan Africa, which is characterized by erratic rainfall with poor distribution. Sorghum is a drought-tolerant crop by nature with reasonable yield compared to other cereal crops, but such abiotic stress adversely affects the productivity. Some sorghum varieties maintain green functional leaves under post-anthesis drought stress referred to as stay-green, which makes it an important crop for food and nutritional security. Notwithstanding, it is difficult to maintain consistency of tolerance over time due to climate change, which is caused by human activities. Drought in sorghum is addressed by several approaches, for instance, breeding drought-tolerant sorghum using conventional and molecular technologies. The challenge with conventional methods is that they depend on phenotyping stay-green, which is complex in sorghum, as it is constituted by multiple genes and environmental effects. Marker assisted selection, which involves the use of DNA molecular markers to map QTL associated with stay-green, has been useful to supplement stay-green improvement in sorghum. It involves QTL mapping associated with the stay-green trait for introgression into the senescent sorghum varieties through marker-assisted backcrossing by comparing with phenotypic field data. Therefore, this review discusses mechanisms of drought tolerance in sorghum focusing on physiological, morphological, and biochemical traits. In addition, the review discusses the application of marker-assisted selection techniques, including marker-assisted backcrossing, QTL mapping, and QTL pyramiding for addressing post-flowering drought in sorghum.

scholarly journals Environmental impact and genetic expressions of new drought tolerant maize genotypes in derived savannah agro-ecology

2021 ◽  
Vol 13 (1) ◽  
pp. 10691
Author(s):  
Paul INYANG ◽  
Chikezie O. ENE ◽  
Ankrumah EMMANUEL ◽  
Uchechukwu P. CHUKWUDI ◽  
Ugochukwu N. IKEOGU
Keyword(s):  
Food Security ◽  
Block Design ◽  
Sub Saharan Africa ◽  
International Institute ◽  
Improvement Program ◽  
Yield Data ◽  
Drought Tolerant ◽  
Maize Genotypes ◽  
Maize Varieties ◽  
Sub Saharan

Reduced water resources in sub-Saharan Africa will not only pose threat to the livelihood of poor resource farmers, but also food security in the region. Drought tolerant (DT) maize varieties hold promise to reducing poor resourced farmers’ vulnerability and improve food security in sub-Saharan Africa. Ten maize genotypes obtained from the International Institute of Tropical Agriculture (IITA), were evaluated in 2015 and 2016 using a randomized complete block design experiment with three replications to estimate their genetic variability and predict their genetic advances in the derived savannah agro-ecology. Growth, phenological and yield data were collected from 10 middle row plants. Genetic advance, genotypic, phenotypic and environmental coefficients of variations and their variances were estimated. Principal component and hierarchical cluster analyses were also performed. The dendrogram showed that at 80% dissimilarity point, the genotypes were grouped into clusters A, B and C in both years. The first two principal components explained 91.8% and 93.3% of the total variation in 2015 and 2016, respectively. Number of grains cob-1, plant height and number of days to physiological maturity were consistent in explaining the variations observed in the maize population. Heritability estimates in broad sense ranged from 1.35% for number of leaves to 87.43% for grain yield per hectare. The genetic parameters studied showed significant variations among the growth, phenological and yield data collected that warrants selection and maize improvement program using the DT maize inbred lines in derived savannah agro-ecology.

Drought tolerance assessment of African cowpea accessions based on stomatal behaviour and cell membrane stability

2008 ◽  
Vol 146 (6) ◽  
pp. 689-694 ◽  
Author(s):  
M. T. LABUSCHAGNE ◽  
R. VERHOEVEN ◽  
M. NKOUANESSI
Keyword(s):  
Cell Membrane ◽  
Drought Tolerance ◽  
Membrane Stability ◽  
Sub Saharan Africa ◽  
Cell Membrane Stability ◽  
Drought Tolerant ◽  
Stomatal Behaviour ◽  
Wide Range ◽  
Drought Conditions ◽  
Sub Saharan

SUMMARYIn Sub-Saharan Africa, cowpea is well known for its ability to survive under conditions of water stress and it plays an important role in regions where drought is the factor most limiting to crop yield. In the present study, the drought tolerance levels of 20 African cowpea accessions from three countries were evaluated. A number of the genotypes showed drought tolerance, the merits of stomatal behaviour and cell membrane stability to assess drought tolerance was demonstrated. Damage to the cell membranes caused by drought was less in tolerant accessions. Stomatal opening was also better regulated; the opening was smaller under drought conditions, thus reducing transpiration (T). The wide range of drought tolerance observed among the accessions suggests the possibility of breeding drought-tolerant cultivars in cowpea. Drought-tolerant accessions included Bafoussam 1, M.66, Bafoussam 3, Hluhluwa, Bafoussam 4, Balen, Makueni, Bafoussam 2 and Okhalweni and these could be recommended to breeders as valuable material for drought tolerance improvement in cowpea.

scholarly journals Drought and High Temperature Stress in Sorghum: Physiological, Genetic, and Molecular Insights and Breeding Approaches

2021 ◽  
Vol 22 (18) ◽  
pp. 9826
Author(s):  
V. B. Rajendra Prasad ◽  
Mahalingam Govindaraj ◽  
Maduraimuthu Djanaguiraman ◽  
Ivica Djalovic ◽  
Anjali Shailani ◽  
...  
Keyword(s):  
High Temperature ◽  
Drought Tolerance ◽  
Compatible Solutes ◽  
High Temperature Stress ◽  
Sub Saharan Africa ◽  
Hybrid Breeding ◽  
Stay Green ◽  
Breeding Programs ◽  
Breeding Lines ◽  
Germplasm Collections

Sorghum is one of the staple crops for millions of people in Sub-Saharan Africa (SSA) and South Asia (SA). The future climate in these sorghum production regions is likely to have unexpected short or long episodes of drought and/or high temperature (HT), which can cause significant yield losses. Therefore, to achieve food and nutritional security, drought and HT stress tolerance ability in sorghum must be genetically improved. Drought tolerance mechanism, stay green, and grain yield under stress has been widely studied. However, novel traits associated with drought (restricted transpiration and root architecture) need to be explored and utilized in breeding. In sorghum, knowledge on the traits associated with HT tolerance is limited. Heat shock transcription factors, dehydrins, and genes associated with hormones such as auxin, ethylene, and abscisic acid and compatible solutes are involved in drought stress modulation. In contrast, our understanding of HT tolerance at the omic level is limited and needs attention. Breeding programs have exploited limited traits with narrow genetic and genomic resources to develop drought or heat tolerant lines. Reproductive stages of sorghum are relatively more sensitive to stress compared to vegetative stages. Therefore, breeding should incorporate appropriate pre-flowering and post-flowering tolerance in a broad genetic base population and in heterotic hybrid breeding pipelines. Currently, more than 240 QTLs are reported for drought tolerance-associated traits in sorghum prospecting discovery of trait markers. Identifying traits and better understanding of physiological and genetic mechanisms and quantification of genetic variability for these traits may enhance HT tolerance. Drought and HT tolerance can be improved by better understanding mechanisms associated with tolerance and screening large germplasm collections to identify tolerant lines and incorporation of those traits into elite breeding lines. Systems approaches help in identifying the best donors of tolerance to be incorporated in the SSA and SA sorghum breeding programs. Integrated breeding with use of high-throughput precision phenomics and genomics can deliver a range of drought and HT tolerant genotypes that can improve yield and resilience of sorghum under drought and HT stresses.

scholarly journals Circular Bioeconomy Research for Development in Sub-Saharan Africa: Innovations, Gaps, and Actions

2021 ◽  
Vol 13 (4) ◽  
pp. 1926 ◽  
Author(s):  
Shiferaw Feleke ◽  
Steven Michael Cole ◽  
Haruna Sekabira ◽  
Rousseau Djouaka ◽  
Victor Manyong
Keyword(s):  
Gap Analysis ◽  
Farming Systems ◽  
Crop Productivity ◽  
Sub Saharan Africa ◽  
International Institute ◽  
The Public ◽  
Secondary Sources ◽  
Use Efficiency ◽  
Sub Saharan

The International Institute of Tropical Agriculture (IITA) has applied the concept of ‘circular bioeconomy’ to design solutions to address the degradation of natural resources, nutrient-depleted farming systems, hunger, and poverty in sub-Saharan Africa (SSA). Over the past decade, IITA has implemented ten circular bioeconomy focused research for development (R4D) interventions in several countries in the region. This article aims to assess the contributions of IITA’s circular bioeconomy focused innovations towards economic, social, and environmental outcomes using the outcome tracking approach, and identify areas for strengthening existing circular bioeconomy R4D interventions using the gap analysis method. Data used for the study came from secondary sources available in the public domain. Results indicate that IITA’s circular bioeconomy interventions led to ten technological innovations (bio-products) that translated into five economic, social, and environmental outcomes, including crop productivity, food security, resource use efficiency, job creation, and reduction in greenhouse gas emissions. Our gap analysis identified eight gaps leading to a portfolio of five actions needed to enhance the role of circular bioeconomy in SSA. The results showcase the utility of integrating a circular bioeconomy approach in R4D work, especially how using such an approach can lead to significant economic, social, and environmental outcomes. The evidence presented can help inform the development of a framework to guide circular bioeconomy R4D at IITA and other research institutes working in SSA. Generating a body of evidence on what works, including the institutional factors that create enabling environments for circular bioeconomy approaches to thrive, is necessary for governments and donors to support circular bioeconomy research that will help solve some of the most pressing challenges in SSA as populations grow and generate more waste, thus exacerbating a changing climate using the linear economy model.

scholarly journals Drought Stress in Grain Legumes: Effects, Tolerance Mechanisms and Management

Agronomy ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2374
Author(s):  
Marium Khatun ◽  
Sumi Sarkar ◽  
Farzana Mustafa Era ◽  
A. K. M. Mominul Islam ◽  
Md. Parvez Anwar ◽  
...  
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Association Studies ◽  
Stomatal Closure ◽  
Grain Legumes ◽  
Grain Legume ◽  
Developmental Cycle ◽  
Genome Wide Association Studies ◽  
Tolerance Mechanisms ◽  
Drought Tolerant

Grain legumes are important sources of proteins, essential micronutrients and vitamins and for human nutrition. Climate change, including drought, is a severe threat to grain legume production throughout the world. In this review, the morpho-physiological, physio-biochemical and molecular levels of drought stress in legumes are described. Moreover, different tolerance mechanisms, such as the morphological, physio-biochemical and molecular mechanisms of legumes, are also reviewed. Moreover, various management approaches for mitigating the drought stress effects in grain legumes are assessed. Reduced leaf area, shoot and root growth, chlorophyll content, stomatal conductance, CO2 influx, nutrient uptake and translocation, and water-use efficiency (WUE) ultimately affect legume yields. The yield loss of grain legumes varies from species to species, even variety to variety within a species, depending upon the severity of drought stress and several other factors, such as phenology, soil textures and agro-climatic conditions. Closure of stomata leads to an increase in leaf temperature by reducing the transpiration rate, and, so, the legume plant faces another stress under drought stress. The biosynthesis of reactive oxygen species (ROS) is the most detrimental effect of drought stress. Legumes can adapt to the drought stress by changing their morphology, physiology and molecular mechanism. Improved root system architecture (RSA), reduced number and size of leaves, stress-induced phytohormone, stomatal closure, antioxidant defense system, solute accumulation (e.g., proline) and altered gene expression play a crucial role in drought tolerance. Several agronomic, breeding both conventional and molecular, biotechnological approaches are used as management practices for developing a drought-tolerant legume without affecting crop yield. Exogenous application of plant-growth regulators (PGRs), osmoprotectants and inoculation by Rhizobacteria and arbuscular mycorrhizal fungi promotes drought tolerance in legumes. Genome-wide association studies (GWASs), genomic selection (GS), marker-assisted selection (MAS), OMICS-based technology and CRISPR/Cas9 make the breeding work easy and save time in the developmental cycle to get resistant legumes. Several drought-resistant grain legumes, such as the chickpea, faba bean, common bean and pigeon pea, were developed by different institutions. Drought-tolerant transgenic legumes, for example, chickpeas, are developed by introgressing desired genes through breeding and biotechnological approaches. Several quantitative trait loci (QTLs), candidate genes occupying drought-tolerant traits, are identified from a variety of grain legumes, but not all are under proper implementation. Hence, more research should be conducted to improve the drought-tolerant traits of grain legumes for avoiding losses during drought.

scholarly journals Evaluation of Nutritional and Antinutritional Properties of African Yam Bean (Sphenostylis stenocarpa (Hochst ex. A. Rich.) Harms.) Seeds

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Taofeek T. Adegboyega ◽  
Michael T. Abberton ◽  
AbdelAziz H. AbdelGadir ◽  
Mahamadi Dianda ◽  
Busie Maziya-Dixon ◽  
...  
Keyword(s):  
Protein Content ◽  
Protein Energy Malnutrition ◽  
Research Field ◽  
Sub Saharan Africa ◽  
International Institute ◽  
African Yam Bean ◽  
Protein Energy ◽  
Small Holder Farmers ◽  
Sub Saharan ◽  
Sphenostylis Stenocarpa

African yam bean (Sphenostylis stenocarpa (Hochst ex. A. Rich.) Harms) is an annual legume with the capacity to produce bean seeds in a pod and produce tubers with varying seed patterns and colors. It is suggested to have the potential to significantly boost food security in sub-Saharan Africa due to its considerable nutritional qualities but still yet underutilized. Many farmers show limited interest in its production owing to limited knowledge of its nutritional profile, income generation capacity for small-holder farmers’, processing, and other related utilization concerns. This study evaluated the proximate and antinutrient composition of processed and unprocessed seeds of African yam bean (Sphenostylis stenocarpa (Hochst ex. A. Rich.) Harms.). Seeds were harvested from the experimental research field consisting of 50 accessions at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria. They were divided into two portions; the first was processed by oven drying at 60°C for 24 hours and the second was left raw. There were significant differences (P<0.05) in the levels of proximate and antinutrient in the forms in which the samples were analyzed. TSs104 had the highest protein content of 25.08%, while the lowest was TSs68 (20.50%). However, in the unprocessed seed, protein content ranged between 24.93% (TSs38) and 19.13% (TSs11). Both processed and unprocessed seeds had high carbohydrate contents. In processed seeds, TSs9 (62.93%) had the highest percentage and TSs1 (29.64%) recorded the lowest. In unprocessed seed, the percentage ranged between 67.36% (TSs4) and 54.23% (TSs38). The observed variation may suggest possible suitability of seed for various end-use products and targeted breeding programs for crop improvements. In sub-Saharan Africa, this lesser-known legume could be adapted as a promising food crop in combating protein-energy malnutrition.

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