ISSN:
1439-0523
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
Notizen:
The importance of epistasis for forage performance and quality traits was studied in early maturing European maize (Zea mays L.) breeding materials. Sixty-six three-way crosses (3W), 33 of the flint x (dent · dent) and 33 of the dem × (flint · flint) type, were compared with the mean of their respective non-parental single crosses (〈inlineGraphic alt="inline image" href="urn:x-wiley:01799541:PBR185:PBR_185_mu1" location="equation/PBR_185_mu1.gif" extraInfo="missing"/〉) using data obtained in six environments. For each of the 11 traits examined, at least 6 out of the 66 three-way crosses displayed significant (P 〈 0.05) epistatic deviations, calculated as 〈inlineGraphic alt="inline image" href="urn:x-wiley:01799541:PBR185:PBR_185_mu1" location="equation/PBR_185_mu1.gif" extraInfo="missing"/〉– 3W. Averaged over crosses and environments, epistatic deviations were highly significant (P 〈 0,31] for 8 trails, but of minor importance except for grain yield. In general, the variance of epistatie deviations was appreciably smaller than the variance of genotype × environment interactions. Highly significant correlations occurred among epistatie deviations for silking date, dry matter content of ear, and dry matter yield of grain and stover. The reliability of predicting the performance of three-way crosses from 2W as opposed to assessing them directly was investigated as a function of the number of test environments. Disturbing e fleets of epistasis on prediction only became important under intense testing (〉 3 or 4 environments), With fewer test environments, both procedures were almost equivalent, due to a smaller influence of genotype × environment interaction on the 〈inlineGraphic alt="inline image" href="urn:x-wiley:01799541:PBR185:PBR_185_mu1" location="equation/PBR_185_mu1.gif" extraInfo="missing"/〉 values, Epistasis is concluded to be of minor importance with regard to the optimum type of hybrid for forage use.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1439-0523.1987.tb01115.x
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