HETEROSIS AND YIELD COMPONENTS OF SOME F1 HYBRIDS OF SWEET POTATO.

Abstract

True seeds of twenty sweet potato lines were collected and used for croup production. The six hybrids were evaluated in a randomized complete blocks design with four replicates with best two check cvs (Mabrouka and Abees) for some morphological and root yield characters at Motopous conditions Kaferel Sheikh, Governorate . Differences were found among the F1 hybrids in all studied traits. All the F1 hybrids significantly exceeded the two cheek cvs. The percentage of increase in the hybrids with Mabrouka cv. was ranged from (168%) in the hybrid No (1) to (51.5%) in the No (3). While it ranged from (173%) to (56%) compared with Abees cv. Average tuber root was highly significant in hybrids No (4) compared with the two check cvs. Two degrees of skin colour, i.e., purple and dark purple, were observed in roots of the hybrids, while six degrees of flesh colour from white to purple were noticed in this study. Most of F1 hybrids significantly exceeded the to check cultivar in most studied traits. Hybrid vigor attributed to over dominance was detected in total tuber root yield and the other studied traits. Dominance in complete and partial was also observed.