Adegbehingbe Felix Taiwo

University of Ibadan, Ibadan (PhD)

Research Topic

Genetic analysis of reproductive stage tolerance of rice (Oryza sativa L.) adapted in West Africa

Research Description

In Asia there has been considerable success in breeding for drought tolerance in rice (Oryza sativa). Improved drought-tolerant Asian rice varieties developed through MAS when introduced in West Africa performed poorly. QTLs for drought tolerance identified in Asia did not show the same phenotypic effect in Africa. This could be attributed to QTL x environment interaction. This necessitates the need to explore local drought tolerant donors in well-adapted genetic backgrounds to identify QTLs for drought tolerance. Such large-effect drought QTL could be used to increase breeding efficiency through marker-assisted selection in West Africa. In West Africa, IRAT109 has been identified as a highly drought tolerant line whereas WITA4 as high yielding but drought susceptible genotype. Recombinant Inbred Lines (RIL) was developed with IRAT109 as donor parent while WITA4 as recurrent parent. 400 BC1F3 RIL of IRAT109 and WITA4 were evaluated under reproductive stage drought and under control conditions to identify QTLs associated with grain yield under severe drought. The population was genotyped by sequencing SNP markers. Three candidate lines have been identified showing at least 15% grain yield advantage, across the two key sites for drought evaluation, over IRAT109 the tolerant parent. The results showed that in the target interval SNP_ 35749428 and SNP_ 35750084 on chromosome 2 a large-effect QTL for grain weight was identified explaining over 45.54% variation in grain yield under drought [logarithm of the odds] > 4.0).


ODESOLA KAFILAT

UNIVERSITY OF IBADAN(PHD)

Research Topic

GWAS OF DROUGHT TOLERANCE IN BAMBARA GROUNDNUT

Research Description

Bambara groundnut (Vigna subterranean (L.) Verde.) is an African indigenous legume which is popular in most parts of Africa. It is the third important grain legume in most African countries after cowpea and groundnut and falls under the group of crop regarded as underutilized food crop. It is known to be a good supplement to cereal-based diet and nutritionally superior to other legumes (Azam-Ali et al. 2001). This proposed study seeks to use an integrated approach towards incorporating morphological, and molecular studies for better understanding of drought tolerant characteristics of Bambara groundnut for improved knowledge of the germplasm and its utilization in Nigeria.


Abdulyekeen Latifah

University of Ibadan(M.Sc.)

Research Topic

Effectiveness of three therapeutic treatments in eliminating viruses from infected in-vitro yam

Research Description

The virus elimination effectiveness of three different therapeutic methods (with various parameters) was tested on three different infected accessions (TDr 4151, TDr 1808 and TDr 1479) of Dioscorea rotundata infected with Yam mosaic virus (YMV) and Dioscorea alata bacilliform virus (DaBV). Chemotherapy (with Ribavarin® at 10, 20, 25 and 30 mg/L), thermotherapy (36 0C, 38 0C and 40 0C) and cryotherapy (droplet-vitrification and encapsulation-dehydration methods) were applied on 10 meristems excised from each of the accessions and cultured under regeneration conditions. The regenerated plantlets obtained after the therapies were indexed to determine their virus status.


Obeng-Bio Ebenezer

University of Ghana(PhD )

Research Topic

Genetic Analysis of Grain Yield and Other traits of Provitamin-A Quality Protein Maize (Zea mays L.) Inbred Lines Under Stress and Non Stress Conditions.

Research Description

Development, release and commercialization of maize hybrids which combine drought and low soil nitrogen (low-N) tolerance with elevated levels of provitamin-A and quality-protein would be a cheap, effective and sustainable approach of ensuring food security and reducing malnutrition in SSA. Information on combining ability and heterotic groups of any newly developed inbreds is critically needed to guide breeding strategies. This study aimed to examine the combining ability effects of grain yield and other traits of early provitamin-A quality-protein maize inbreds, classify the inbreds into heterotic groups, identify testers, and assess the performance and stability of the hybrids across environments.


Oyedeji Olayinka

Federal University of Agriculture, Abeokuta (PhD )

Research Topic

Genetic and Morpho-physiological basis of Iron deficiency tolerance in upland Rice genotypes

Research Description

Emphasis of nutrient research is channeled to macro- nutrients while little/ no attention is given to micro-nutrients including Iron. Upland Rice production is severely affected under Fe-deficient conditions which are characterized by yellowing of young leaves at seedling stage and necrosis at severity. Farmers are left with no choice but to purchase expensive commercial Fe(III)- EDDHA-based products to ensure reduction in grain yield losses. My research aims to identify upland genotypes tolerant to iron deficiency while understanding the physiological and molecular basis of Fe uptake, translocation and its regulations which will aid in developing lines that are tolerant to Fe deficiency.


Adeboye Kehinde Adewole

Federal University Agriculture, Abeokuta (PhD)

Research Topic

Physiological and Genetic Evaluation of Flowering Delay of Rice Under Reproductive-Stage Drought Stress

Research Description

Understanding of genetic and physiology of plant response to prevailing abiotic stresses is useful in breeding programs to facilitate release of new varieties with optimum coping strategy in the targeted environment. Two diverging flowering patterns (Flowering Delay and No-Flowering Delay) were observed in the PRIMAVERA X WAB638-1 population under drought stress.In both flowering groups, yield reduction under water stress compared with well-watered condition is below 50%. These progenies are being used in physiological and genetic analysis of the observed flowering mechanism under stress. Genome profiling of the population is ongoing with SNP Markers.


Adegboyega Taofeek

North-West University, South Africa(PhD )

Research Topic

Genetic Diversity and Nitrogen Fixation in Underutilized tropical legumes

Research Description

The Diversity and Nitrogen fixation studies is focused on identifying genotypes of African yam bean and Winged bean with high nodulation and Nitrogen fixation capacities. The nutritional and anti-nutritional assessment of the legumes will be also be identified while the molecular characterization on the root-nodulating bacteria will be determined.


Norman Prince E.

University of Ghana(PhD)

Research Topic

Genetic analysis of tuber yield and quality traits in yam (Dioscorea rotundata)

Research Description

The main objective of this study is to improve yield and quality traits of yam populations using controlled cross and polycross mating techniques. The specific objectives of this study are: (i) determining trait value of yam progenitors for growth, tuber yield and quality attributes; (ii) assessing the merit of parentage analysis for effectively building the relationships among progenies and their parents in yam polycross nursery compared to the conventional technique; (iii) assessing trait heritability and hybrid vigor of seedling traits of progenies derived from polycross and controlled pairwise crosses; (iv) determining trait association among advanced population of yam (Dioscorea rotundata Poir) hybrid genotypes; and (v) determining the quality of stored tuber and flour of advanced populations of D. rotundata hybrids. This research intends to contribute to reduce food and nutrition insecurity through improvement and selection of elite genotypes of D. rotundata for fresh and processed markets.


Fashoranti Ebenezer

University of Ibadan(M.Sc.)

Research Topic

Preliminary Evaluation of Cassava (Manihot Esculenta Crantz) Genotypes for Response to Cassava Mosaic Disease, Total Carotenoid Content and Storage Root Yield

Research Description

Vitamin A deficiency is a major health problem in Africa. Consumption of bio-fortified cassava with enhanced β-carotene (vitamin A precursor) content would help reduce this problem in areas where cassava is a staple food for majority of the populace. There is a need to determine the β-carotene content of newly developed yellow cassava genotypes in a breeding programme. This will enable selection of genotypes with high carotene content before further evaluation for other agronomic parameters. Therefore, this study was conducted to evaluate newly developed biofortified cassava genotypes for total carotenoid content, dry matter and root yield.


Adewuyi Ademola

University of Ibadan(M.Sc.)

Research Topic

EVALUATION OF YELLOW-FLESHED CASSAVA (Manihot esculenta Crantz) CLONES FOR TOTAL CAROTENOID CONTENT, ROOT YIELD AND CULINARY QUALITIES.

Research Description

Objective of my study was to determine the variability among cassava genotypes for total carotenoid content, storage root yield and culinary qualities. Seventy improved cassava genotypes were evaluated in the preliminary evaluation trial with three checks. Twenty-six genotypes categorised as high, medium and low for total carotenoid and dry matter from the seedling evaluation trial were selected and evaluated at different age at harvesting (7, 9 and 12 MAP). Significant negative correlation was observed among total carotenoid, number of roots, root yield and dry matter. The promising genotypes for total carotene content will be improved further for dry matter content.

Contact Us

  • Address: IITA Headquarters, PMB 5320, Oyo Road, Ibadan 200001, Oyo State, Nigeria

  • Phone: (+234)806-435-3738

  • Email: iita-iarsaf@cgiar.org