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Articles by A.C. Odiyi
Total Records ( 2 ) for A.C. Odiyi
  A.C. Odiyi
  Information on the relationship between grain yield loss and stem borer damage is important in developing an efficient improvement programme for resistance to the borers. The relative contribution of damage parameters of Sesamia calamistis (Hampson) and Eldana saccharina (Walker) to grain yield loss in maize and interrelationships among them were studied in trials in the early and late seasons of 2002. Moderate to high correlations were observed among most pairs of resistance traits. Grain yield loss had moderate correlations with leaf feeding damage, number of broken stalks and stem tunnelling. Genetic correlations between resistance parameters and other agronomic traits were predominantly negative. In the path analysis, stem tunnelling and leaf feeding damage exerted the highest positive and direct effects on grain yield loss. Other resistance traits showed negative direct effects. Indirect effects of dead heart count and number of broken stalks were high through stem tunnelling whereas cob damage count showed high indirect effect through leaf feeding damage. Correlated responses to selection show that selection for improved grain yield would positively influence reduction in stem tunnelling.
  B.O. Akinyele and A.C. Odiyi
  Comparative study of the vegetative characters was carried out on representative samples of different populations of Aloe vera L. Plant samples collected from different locations in Nigeria were separated into four morphologically recognizable groups and brought into cultivation in the screen house of the Department of Crop, Soil and Pest Management, Federal University of Technology, Akure, Nigeria. After six months of cultivation, 10 suckers of each morphological group were carefully removed and transplanted into plastic containers already filled with humus soil such that there was only one sucker in each container. The experimental design adopted is the Completely Randomized Design (CRD). New suckers produced were promptly and carefully removed from time to time, leaving only the parent plant in each container. Five years after transplanting, leaf length, leaf width, leaf thickness, stem length and stem thickness were measured using a tape graduated in millimeters and centimeters. Number of leaves per plant and number of roots per plant were counted. Mottle frequency and spine frequency were also determined. Mean values for each morphological group were calculated from five randomly selected specimens. Data collected were subjected to Analysis of variance (ANOVA) and means separated using the Duncan=s multiple range test. Result shows that the groups are separated into four different taxa, each group occupying a taxon of its own. This finding is at variance with the existing taxonomy of Aloe and therefore, suggests further investigations, particularly in the areas of chromosome behaviour and anatomy, with a view to reappraising the existing taxonomic status of Aloe vera.
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