GENETIC VARIABILITY IN PLANT TYPES' OF SORGHUM {Sorghum bicolor (L.) MOENCH) DERIVED FROM GAMMA-RAY IRRADIATION
GENETIC VARIABILITY IN PLANT TYPES' OF SORGHUM {Sorghum bicolor (L.) MOENCH) DERIVED FROM GAMMA-RAY IRRADIATION
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Date
2002-09
Authors
Aba, D. A.
Alabi, S. O.
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Abstract
Variability was created in an improved sorghum variety SK 5912 using gamma-ray irradiation (Cobalt source) 60Co. The Mo seeds were advanced to My and from the M3 family selections were made of 34 lines based on medium height, disease free plants and good yields. These were advanced to M4 family lines. The M4 families were harvested and threshed and were divided into three equal portions for evaluation. The materials were evaluated in the Institute for Agricultural Research Farms for three years (1989, 1990 and 1991). The objective was to determine the variations resulting from the gamma-ray irradiation using the multivariate analysis procedure of factor analysis. Fhenotypic correlations were computed for the individual and combined years using the component, of variance and convariances. Principal component analysis, procedure was used to extract factors (TC) that account for the variations in the plant types of sorghum using the twenty
two characters evaluated. In 1989 non-reproductive structures (II) photosynthetic) accounted for 5.75% of the total variations in F,, I" leaf sheath, Td intcrnode length, accounted for 2.24% of the total variation in F2. In 1990, the same nonreproductive structures (12) accounted for 5.51% of the total variations in F,, and only the lengths of leaf blades accounted for 2.72% of the variations in F2. In 1991 the lengths of five internodes accounted for 2. 75% of variation in F, while only lengtlis of the four leaf blades accounted for 2.25% of variations in F2. In the combined component analysis lengths of five internodes accounted for 4.96% of the total variation in F,, while lengtlis of three leaf blades, grain wt/spikelet and Days to 50% flowering accounted for 2.60% of the variation in F2. These results are useful in identifying the characters that give much variations and are correlated to the yield attributes, to be selected for in order to improve yield in the plant types, using
recurrent selection procedure.
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Preprint Journal Article
Keywords
irradiation,, plant types,