Postprint Journal Articles

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Browsing Postprint Journal Articles by Author "Aba, D. A."

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    GENOTYPIC AND PHENOTYPIC VARIANCE AND CORRELATIONS IN S5 LINES OF A PEARL MILLET POPULATION (Pennisetum americanum (L.) Lcckc)
    (2004-03) Yeye, M. Y.; Aba, D. A.
    There were 78 S5 lines of a nutlet population evaluated in two locations for two years in 1998 and 1992 using a simple 9x9 lattice design because of the great number of genotypes involved. Mean performance over the two locations were similar for some traits, hut different for certain others. Analysis of variances pooled over the years and locations indicated that genotypic mean square estimates were significant at 1% level of probability for plant height, car length, ear weight and threshing percentage, and at 5% level for grain yield per ear, days to 50% heading and days to 50%, blooming. Over the locations, the estimates were significant at 1% level for noding and threshing percentage. Both negative and positive correlation coefficients were observed and for a larger number of the associations in the population, the genotypic correlation coefficients were slightly higher than the phenotypic. The highest correlation coefficient was obtained between the ear weight and threshing percentage. The tallest plants were also positively correlated with plant noding (rg 0.910). Based on the correlation coefficient obtained in this study, plant nodding and ear characters would be best selection indices for obtaining a high yielding millet population. The closeness between phenotypic and correlation coefficient will render efficient any selection based on the phenotype,
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    Influence of Desiccation Time on Survival and Regeneration of Embryonic Axes of Groundnut {Arachis hypogaea L.) Immersed in Liquid Nitrogen
    (2013-08) Ahdulmalik, M. M.; Usman, I. S.; Olarewaju, J. D.; Aba, D. A.
    Cryoprcscrvation, the storage of biological materials in liquid nitrogen (LN), is a useful method for long term conservation of plant germplasin. This study was carried out with the objective of establishing an efficient desiccation technique for successful cryopreservalion and recovery of embryonic axes of groundnut. Rmbryonic axes of four groundnut {Arachis hypugaeu I..) genotypes were evaluated. The excised embryonic axes were dehydrated by air current of a laminar air flow cabinet for different duration (0, I, 2, 3, 4 & 5 hrs) before being plunged in LN (-196°C) and held for 1 hr. Samples were thawed in water bath at 40°C for 2 min, thereafter cultured on MS medium supplemented with 15 mg/L BAP for recovery. Highest survival (96.67% - 100%) and shoot formation (91..67% - 96.67%) were obtained at an average moisture content of 17% after 4 - 5 hr desiccation. Among the genotypes evaluated, Sannut 22 and Sanimit 23 recorded the highest survival and shoot formation, This technique therefore appears promising for cryoprcscrvation of groundnut gennplasm.
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    Varietal resistance of Sorghum bicolor (L.) Moench to Sporiosorium sorghi Link in Nigeria
    (1996) Marleyt, P. S.; Aba, D. A.
    Sorghum genotypes were screened for resistance to Sporiosorium sorghi in the screenhouse and in the field. Scrccnhousc trials showed ICSV 2 and 1CSV 1049 to have considerable resistance while ICSV 1002 was completely immune. Field trials in 1994 and 1995 confirmed them to be resistant.