Genetic Variability and Correlation of Traits among Progenies of Potato Crosses in Ethiopia
Background: Investigating the causes and magnitude of genetic variation in segregating potato population that derived from crossing is vital to know the genetic consequences of hybridization and improve potato varieties. However, very little effort has been carried in creating local population through crossing and genetic information on created potato population.
Objective: The study was conducted to assess genetic variability and correlation among traits in locally created potato crosses population.
Materials and Methods: A total of 81 genotypes were evaluated for 18 traits in a 9 x 9 simple lattice design. Data collection and analysis was done from sixteen plants or central rows.
Results: The results revealed highly significant variations for all traits except proportion of medium tuber size and specific gravity of tubers indicating the existence of genetic variability among population. Marketable and total tuber yields variability of tested genotypes ranged from 2.51 to 55.62 t ha -1 and 10.82 to 58.31 t ha -1, respectively. The phenotypic and genotypic coefficients of variation ranged between 4.67 to 92.88% and 3.25 to 73.5%, respectively. Heritability in broad sense and genetic advance as percent of mean also ranged from 28.81 to 91.64% and 4.65 to 90.33%, respectively with less influence of environmental fluctuations. Total tuber yield had positive and significant phenotypic and genotypic correlations with stem height, tuber yield per plant, tuber number per plant, average tuber weight and marketable tuber yield. This indicated that the traits are heritable with governing of additive gens for effective selection.
Conclusion: The range and mean values of the variables obtained suggest the existence of sufficient variability among the tested and possibility of wide genetic base creation for improving potato population using locally created genotypes. Hence, promising genotypes with desirable traits could be recommended to produce new variety or use as parental lines for future breeding program.