Ajayo Samuel

Obafemi Awolowo University (PhD)

Research Topic

Genetic analysis and genome-wide association studies of resistance of early and extra-early maturing maize inbreds to turcicum leaf blight (exserohilum turcicum).

Research Description

The most important and destructive diseases of maize are leaf blights. Turcicum leaf blight (TLB) incited by Exserohilum turcicum is a ubiquitous and endemic foliar disease of maize that causes severe yield losses especially when environmental conditions are optimal for the disease development. Safe, durable and most economic control method of the disease is through the use of resistant varieties. Thus, assessing the genetic mechanism and identification of gene(s) conferring resistance to TLB is fundamental to the development of resistant varieties. This study will provide information on the mode of inheritance of resistance to TLB in early and extra-early maize inbreds.


Adewale Samuel

Obafemi Awolowo University, Ile Ife, Osun State, Nigeria. (PhD )

Research Topic

Heterotic Response and Inheritance Patterns of Tropical Early-maturing Maize Inbred Lines under Striga Infestation and Drought Stress Conditions

Research Description

Drought stress and Striga hermonthica parasitism greatly limit the high yield potential of maize in West and Central Africa. Information on the heterotic patterns and the extent of diversity in many of the newly developed early inbreds by the IITA Maize Program, with improved levels of tolerance to drought stress and Striga infestation, is lacking. Therefore, information on heterotic groups of the inbreds using the HGCAMT, SNP molecular markers and HSGCA methods would be invaluable to the hybrid maize program at IITA and at national programs in the sub-region.


Zate Zewdneh Zana

University of Ibadan(M.Sc.)

Research Topic

Quantitative Trait Loci Mapping in Cowpea

Research Description

Cowpea is an important food legume with multiple benefits in sub-Saharan Africa (SSA). However, its productivity in SSA farmers’ fields is very low due to several biotic and abiotic stresses. Developing improved varieties that give high yield per unit area and resistant to biotic and abiotic stresses (stacking of desirable traits) using molecular techniques is among the major goal of cowpea breeding and improvement programs. However, implementation of molecular breeding techniques in cowpea is severely limited by the limited availability of useful trait-linked genetic markers or QTLs for various agronomic traits. Hence, the objective of this study was to construct genetic linkage map of cowpea and identify regions of the genome associated with some agronomic traits of cowpea in the F2 population developed from a cross between a cowpea line (TVu2185) and a yardlong bean line (TVu 6642).


Akinsanya Aminat

Federal University of Agriculture, Abeokuta (PhD )

Research Topic

Effect of Meloidogyne incognita on the yield and nutritional qualities of six bio-fortified cassava varieties.

Research Description

It focuses on nematodes as pest of bio-fortified cassava and looks forward to know if nematode infection can significantly affect the yield and nutritional qualities of six bio-fortified cassava.


Akpojotor ufuoma

Obafemi Awolowo University (M.Sc.)

Research Topic

SEED PROTEIN CONTENT AND DIVERSITY ARRAYS TECHNOLOGY (DArT) MARKERS CHARACTERIZATION OF SELECTED BAMBARA GROUNDNUT (Vigna subterranea (L.) VERDCOURT) ACCESSIONS

Research Description

The study investigated variability in the seed protein content of bambara groundnut accessions, examined genetic relationship among the accessions using DArTseq SNP markers and determined the relationship between seed protein content and cooking time of the accessions with a view to develop new varieties of the crop. The first experiment, which determined seed protein content of 50 bambara groundnut accessions by Kjeldahl method, had a completely randomised design (CRD) with three replicates. The second experiment employed DArTseq SNP markers for assessing genetic relationships among 48 bambara groundnut accessions. Forty μl of DNA was used for DArTseq SNP analysis. Heterozygosity, polymorphic information content, genotype call rate, reproducibility and genetic distance were obtained using DArTsoft 14. Principal component analysis and Neighbour-Joining cluster analysis were used to analyse the genetic relationship among the accessions. Seed protein content among the accessions showed significant difference at 0.05 level of probability. The seed protein content ranged from 25.98 to 12.99% with a mean value of 20.43%. Out of the 50 bambara groundnut accessions used for this study, 16 accessions (32%) had high seed protein content with a mean value of 23.10%, 21 accessions (42%) had medium seed protein content with a mean value of 20.34% and 13 accessions (26%) had low seed protein content with a mean value of 17.28%. The accession with the highest seed protein content was TVSu 1278 with seed protein content of 25.98%. The correlation between seed protein content and cooking time was -0.16 indicating a very weak negative relationship between the two parameters. From the result of the diversity experiment carried out on 48 bambara groundnut accessions, the principal component analysis revealed three major groups while the Neighbour-Joining cluster analysis revealed four major however both clustered the accessions based on their geographical location. There was genetic diversity among the accessions based on the groupings of the principal component analysis and Neighbour-Joining cluster analysis. The average of the polymorphic information content (PIC) and heterozygosity values was 0.23 and 0.17 respectively indicating that the markers are slightly informative and establishing the fact that bambara groundnut is an autogamous plant. This study concluded that there was variability in the seed protein content of bambara groundnut accessions. Also, there was genetic diversity among the accessions and there was no significant correlation between the seed protein content and cooking time.


Ologunde Olanrewaju

Federal University of Agriculture, Abeokuta (M.Sc.)

Research Topic

Effect of Schedule Planting and Harvesting on Soil Physical Properties and Cassava Performance

Research Description

The research is to investigate the effect of different planting and harvesting times of cassava on soil physical properties and cassava performance. The planting periods are April, June and August. For each of the planting periods, there will be harvesting at 9 MAP, 11 MAP and 13 MAP. The treatments also include varieties (TME 419 and TMS 30572) and fertilization. The cassava harvested will be accessed and compared for its starch content. Also, the soil physical properties will be determined. The soil physical properties will include, bulk density, saturated hydraulic conductivity, soil infiltration, soil temperature, porosity and particle size distribution.


OYEBADE BLESSING

FEDERAL UNIVERSITY OF AGRICULTURE, ABEOKUTA (M.Sc.)

Research Topic

EFFECT OF FERTILIZER TYPES ON SOIL CHEMICAL PROPERTIES AND CASSAVA PERFORMANCE IN SOME SOUTH WEST NIGERIAN SOILS

Research Description

The justification of this study goes thus: Many times, farmers are only particular about yield from croplands. However, majority of them tend to indiscriminately apply blanket recommendation of mineral fertilizers with little or no knowledge of the effects of such applications on soil. It has also been observed that application of inorganic fertilizers arguably have side effects on the roots of cassava and the post-harvest physiological processes of this cassava roots. Hence, it becomes pertinent to know the important nutrient that will improve the growth and yield of the cassava plant and the effect of such inorganic nutrient and micronutrients amendments on soil chemical properties

The objectives of this study are to: Determine the effect of different nutrient combination on cassava growth and yield, Evaluate the dynamics of soil chemical properties with the application of fertilizers and Evaluate the relationship between soil chemical properties and cassava morphological traits.


Olasupo Kayode

Federal University of Technology, Akure (M.Sc.)

Research Topic

Genetic Variability of Partially Inbred Progenies and Hybrid Clones for Virus Disease Reaction, Yield and Total Carotenoids Concentration in Cassava

Research Description

Cassava is one of the major food and security crop in Sub-Saharan Africa (SSA). It is highly heterozygous and this is not suited for genetic studies, developing homozygous inbred lines which would allow for specific hybrid combinations have being a bottleneck. Hence, the study focused on evaluates the genetic variability for partially inbred progenies and hybrid cassava clones. It also design to access the amount of heritable variability which exist within the partially inbred and hybrid cassava progeny that can be further exploited for crop improvement. It also sought to study the association between yield and yield related traits. To achieve this aforementioned objectives, A preliminary yield trial were conducted in IITA, Ibadan, Nigeria during 2016-2017 cropping season using 82 inbred progenies and 43 hybrid cassava clone, two standard commercial varieties was using (IITA-TMS-IBA070593 and TMEB419) as checks. The field experiments were laid out in Incomplete randomized block design with treatments replicated two times. Observations were made on response of the genotypes to diseases reaction, yield performance and total carotenoid concentration. Data were collected on growth and yield performance.


Onasanya Olabisi

Swiss Federal Institute of Technology (ETH Zurich), Switzerland (PhD )

Research Topic

Evaluation of agronomic practices on growth, yield of cassava and some physical properties of soils in southwestern Nigeria

Research Description

It is widely known that the growth, yield quality and quantity of cassava depend largely on good planting practices (tillage intensity, planting density, fertilization etc.). However, there is paucity of knowledge on such good practices. My research will address the following questions: a) Do tillage intensification, fertiliser application and pre- and post- emergence herbicide weed control increase cassava root yield? b) Does tillage intensification improve soil aggregate stability and thereby increase cassava yield? c) What is the effect of tillage intensification on soil strength and compaction?


PIERRE COBES GATARIRA

Pan African University, university of Ibadan(PAULESI) (PhD )

Research Topic

UNDERSTANDING GENETICS OF FLOWERING ON YAMS USING CONVENTIONAL AND MOLECULAR APPROACHES

Research Description

Yam breeding is very complicated because of variable flowering behavior, making hybridization difficult. Yam clones may be dioecious, monoecious or hermaphrodite with variable sex ratios. The proportion of plants that flower and the flowering intensity also vary with season and location. this study will help To know the variation in flowering and mitigate this variation and Identify genes or QTLs controlling flowering in Yam then Determine how genes are expressed.

Contact Us

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

  • Phone: (+234)806-435-3738

  • Email: iita-iarsaf@cgiar.org