At the Agriculture department office
Appointment on Visitation important
Topic: Screening For Mosaic Disease Resistance And Hydrogen Cyanide (HCN) Content In Cassava At Different Ages
|1.||M.Sc (Plant Breeding)||Pan African University, Institute for Life and Earth Sciences (including Health and Agriculture)||2018|
Genotypic variation in nodulation and grain yield of cowpea (Vigna unguiculata L. Walp) mini core collection
A decline in nitrogen status of soils is experienced in many parts of the world, especially West Africa. However, cowpea (Vigna unguiculata L. Walp) has the ability to fix atmospheric nitrogen through symbiosis with nodule bacteria (Bradyrhizobium spp.) to improve production and maintain soil fertility. The cowpea mini core collections were recently composed at International Institute of Tropical Agriculture (IITA) and there is need for screening of the genotypes for nodulation to determine their nitrogen fixation potential. An understanding of the nitrogen fixation potential and yield of cowpea genotypes will facilitate the development of cowpea varieties with high productivity. The objective of this study was therefore to evaluate cowpea genotypes for nitrogen fixing and yield potential.
A total of 200 cowpea lines selected from among individuals in the mini core collection at IITA, Ibadan were grown in the glass house at IITA using a completely randomised design with three replicates. Data were collected on number of nodules, shoot nitrogen content, total plant biomass, pods per plant and grain yield. Analysis of variance, cluster analysis and linear correlation were carried out on all the variables and significantly different means were separated using LSD at 5%.
Significant genetic variability was observed among the cowpea genotypes used in this study. TVu16521 and TVu8673 were the top nodulating genotypes. The highest value for pods/plant was observed in TVu3156. The highest yield value was observed in TVu3156. The genotypes were grouped into seven clusters and four outliers that were fused into clusters at much higher distances. Positive correlation was observed between number of nodules and each of shoot dry weight and root dry weight.
The broad genetic variation observed among the cowpea lines evaluated in this study for nodulation, growth and yield variables can be explored to improve cowpea further for the desirable traits.
OSHO TOYIN is a Assistant Lecturer at the Department of Agriculture
OSHO has a M.Sc in Plant Breeding from Pan African University, Institute for Life and Earth Sciences (including Health and Agriculture)