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Heritabilities and genetic correlations for yield in Italian ryegrass (Lolium muliflorum Lam.) grow at different densities

Published online by Cambridge University Press:  27 March 2009

F. England
F. England
Affiliation:
Scottish Plant Breeding Station, Pentlandfield, Roslin, Midlothian, Scotland
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Summary

Fifty-nine full-sib progenies produced in a North Carolina Model I design were assessed fortotal yield (sum of three harvests) under four treatments differing in plot size and density. The treatments were: swards of 0.25 m2, spaced plants at 0.6 x 0.6 m and single and double rowswith 0.3 m betweenrows and 0.15 m between plants, with ten plants per row. Estimates of plot heritabilities ranged from 0.24 for spaced plants to 0.59 for double rows. Heritability in the sward was 0.35. Additive genetic correlations between the sward and the other treatments were surprisingly high: about + 0.86 for the spaced plants and between +0.8 and +0.9 for the row plots. The implications of these estimates for the relative selection efficiencies of the non-sward treatments are discussed.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 84 , Issue 1 , February 1975 , pp. 153 - 158
Copyright
Copyright © Cambridge University Press 1975

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