ISHS Acta Horticulturae 380: Symposium on Tropical Root Crops in a Developping Economy
CORRELATED RESPONSE AND USE OF SELECTION INDEX IN CASSAVA |
| Authors: | N.M. Mahungu, H.R. Chheda, M.E. Aken'Ova, S.K. Hahn |
| Abstract:
The correlated response to selections for various cassava traits was assessed with six populations comprising two composites and four segregating F1 families. The merit of indirect selection relative to direct selection for tuberous root yield was in the order of number of tuberous roots (0.82) followed by harvest index (0.74), tuberous root size (0.61), stem girth (0.61), total number of branches (0.55), canopy width (0.50), and plant height at harvest (0.39). Direct selection aimed at improving tuberous root yield resulted in an indirect selection for tuberous root size as effective as direct selection for tuberous root size. Selections made on index value basis, in general, resulted in predicted selection differential equal or similar to those made on direct root yield selection except in two populations where the selection differential from index was much smaller (about 55%) than that of direct root yield selection. | |
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