Phenotypic diversity in the Ethiopian noug (Guizotia abyssinica cass.) germplasm
2001
Tsige Genet(Adet Research Center, Adet (Ethiopia)) | Ketema Belete(Alemaya University of Agricultural, Dire Dawa (Ethiopia))
Noug (Guizotia abyssinica (L.F.) Cass.2n = 30) a member of the compositae family is grown as an oilseed crop in Ethiopia. The crop grown best on poorly drained heavy clay soils. In this experiment 157 noug accessions randomly sampled from different parts of the country were evaluated in a field test at Adet Ethiopia in 1993 to estimate the phenotypic diversity index (H') for phonological (days to flowering, and days to maturity) and morphological (leaf color, leaf margin, stem hairiness, stem color, angle of branching, and plant height) characters. The phenotypic diversity was calculated using Shannon-Weaver diversity index (H') for the regions, provinces, characters and after pooling together all characters. The results of this study indicated that the phenotypic diversity index (H') of noug accessions was 0.61 for Western, 0.56 for Northern, 0.54 for Southern and 0.51 for Central and Eastern Ethiopia. Province wise the highest diversity index was from Gojjam H' =0.60 Welega, H' =0.57 and Shewa H' = 0.53. The phenotypic diversity index for the country was H' = 0.40. Most of the variations were due to difference among provinces for different characters than among regions. Based on the characters studied and small collections evaluated, the centers of diversity for noug appears to be Gojjam, Welega and Shewa and further exploration efforts should be undertaken in these regions.
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