Efficiency of clonal selection on improving some economical characters of sweet potato (Ipomoea hatatas L.) [electronic resource]

Includes bibliographic reference

Two field experiments were conducted in order to study the effect of one cycle of clonal selection on some economical characters of sweet potato and to estimate the magnitude of variability and heritability, as well as calculate phenotypic correlation coefficients among all possible pairs of the studied characters. In this respect, this work was carried out at the Experimental Station Farm (at Abies), the Faculty of Agriculture, Alex. Univ., during two summer seasons of 20 14 and 2015. The obtained results illustrated, generally, that the estimated coefficients of variability and ranges for the all studied characters of "Abies" cultivar reflected high and enough variability, which suggested high possibilities of conducting successful and efficient selection to produce improved cultivar with better perfonnance than its original population. Also, the recorded results demonstrated, in general, that one cycle of clonal selection population; exhibited high efficiency for improving all studied characters, but with different rates, comparing with the original population. The estimated values of the broad sense heritability (h2bs) for the various studied characters were found to be in the range from 71.09% for roots number planr1, up to 99.17% for root dry matter. Correlation estimate revealed many significant associations among the various pairs of the studied characters; which appeared to be desirable for achievement the objectives of the selection in the present study. Accordingly, improving roots yield and its components of sweet potato can be achieved through purification of "Abies" cultivar to produce improved clones through clonal selection program.

Summary in Arabic