Genetic Diversity Of Tef (Eragrosties Tef (Zucc.) Trotter] Land Races from Various Regions of Ethiopia

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Addis Ababa University


Seventy nine tef populations collected from ten administrative regions, seven altitude classes were planted with two improved varieties in simple lattice design at Gute sub-site of Bako Agricultural Research Center during 2007/08 cropping season to assess quantitative and qualitative trait diversity among tef populations, within and between regions and altitudes of origin. Loose and very loose panicle forms, gray panicle color and brown seed colors were abundant across all regions and altitude classes. Whereas, compact and semi-compact panicle forms, red and purple panicle color and white seed color were less frequent. Overall population, across all regions and altitude classes, relatively higher mean Shannon diversity index (H’) were noted for seed color (0.45) and the lowest for panicle form (0.33). Regionally, East Gojam (0.46), Horro Guduru (0.44) and East Wellega (0.43) were regions with maximum H’, but South Wello (0.32) and Bale (0.33) revealed minimum Shannon index. Tef sample collected from 1768-1961m. a.s.l. noted maximum H’ (0.42) and samples collected from altitude range of >2544m. a.s.l. attain the lowest H’ (0.36). Analysis of variance for quantitative trait showed that highly significant (P≤0.01) and significant (P≤ 0.05) variations between treatments were observed for most of quantitative traits considered. The first five principal components explained about 69.2% of the entire diversity among population of which 33.04% of the variation is explained by the first principal component that originated mainly due to metric character such as plant height, panicle length, culm length, first and second culm diameter. A total of 86.8% and 96.1% of the variation between regions of origin and altitudinal classes were explained by the first four and five PC, respectively. About 48.4% of the total trait association showed significant correlation out of which 83.8% of the correlation coefficient was with positive and significant. Cluster analysis of tested materials for quantitative traits resulted in the formation of 13 clusters ranging from 2-19 population per cluster at 50% similarity level and six populations remain outliers. Relatively, higher GCV (52.54%) and H2 (73.073%) were observed for grain yield per plant, lower for number of culm internodes (0.625% and 0.183%, respectively). GA (%mean) was minimum for number of culm internodes (0.058%) and maximum for lodging index (84.683%). High and positive genotypic direct effect on grain yield per plant were obtained from first culm diameter (5.29), panicle length (4.26), spikelete per panicle (2.16), second culm diameter (1.65), harvest index (1.03) and days to grain filling period (0.99). However, high but negative direct effect on grain yield was obtained from plant height (-15.71), culm length (-10.5), lodging index (-3.46), days to 50 % panicle emergence (-3.12), days to 50% maturity (-2.74) and number of panicle branch per main panicle (-1.07). Key Words and phrases: Eragrostis tef, accessions, regional and altitudinal diversity



Eragrostis tef, accessions, regional and altitudinal diversity