ISHS Acta Horticulturae 63: I International Symposium on Floriculture Plant Breeding and Genetics
SINGLE SEED DESCENT: APPLICATIONS AND MERITS IN BREEDING SELF-POLLINATED CROPS |
| Authors: | E.C. Tigchelaar, V. W.D. Casali |
| Abstract:
Field and computer simulation studies were used to estimate breeding progress with pedigree selection, single seed descent (SSD) and combinations of early generation pedigree selection followed by SSD. Pedigree selection was the most effective simulated selection method at high (75%) and moderate (50%) heritabilities. At low (25%) and very low (10%) heritabilities, mass selection and SSD respectively yielded the best single F6 line. Early generation pedigree selection to F4 followed by SSD was not significantly different from pedigree selection alone at all heritabilities simulated. SSD offers greatest benefits in situations where simultaneous selection is required for several characteristics with different heritabilities. SSD simulated alone or in combination with mass selection retained greater genetic variability for line selection in F6. Pedigree or mass selection retained greater genetic variability for line selection in F6. Pedigree or mass selection for highly heritable characters in early generations (F2 and F3) followed by SSD and F6 selection on the basis of line performance for characters of low heritability would appear to maximize progress for most breeding situations. A scheme for combining pedigree selection with SSD for tomato improvement is described. | |
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