Comparative Morphological And Biochemical Studies Of Tempo.-al Genetic Differentiation Of Ill-situ (on-farm) Land Races And Ex-situ Accessions Of Sorghum (sorghulii Bicr (l.) Moench) From North Shoa And South Welo

MOIphological and biochemical (isozyme) study was conducted all sorghumrn(Sorghum bicolor L. Moench) ill-situ (on1'arm) land races and ex-siW accessionsrnobtained from North Showa and SOllth Welo and ji'om the gene bank, respectively.rnPlants were sown and grown under controlled greell house conditioll alld therncharacters to be studied were scored at the appropriate time. On most of thernqualltitative characters scored, it was found that there is a sigllificallt differellce inrnthe means of each character scored, both at P < 0.05 alld P < 0.01 significancernlevels. This excludes meall Ilumber of leaves per given plallt, which is the onlyrncharacter for which 110 variation was observed. Distances bet1Yeell the different landrnraces and accessions were calculated using the Euclidean distallce measurement.rnBased 011 this distance, dendrograms were constructed for both the ex-situ accessiollsrnalld ill-situ land races. Biochemical study was undertakell for two enzyme systems - arnand jJ-Esterase (EST) and acid phosphatase (Aep). There was no variation observedrnfor these two enzyme systems and all the land races and accessions appear to havernthe same banding pallel'll.rnKey words: in-situ, ex-situ, Sorghum hicolor, land races, accessions, isozymes.

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