Genetic variance, coefficient of parentage, and genetic distance of six soybean populations |
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Authors: | T Helms G Vallad P McClean J Orf |
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Institution: | (1) Department of Plant Sciences, North Dakota State University, Fargo, ND 58105, USA, US;(2) Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, USA, US |
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Abstract: | Plant breeders would like to predict which biparental populations will have the largest genetic variance. If the population
genetic variance could be predicted using coefficient of parentage or genetic distance estimates based on molecular marker
data, breeders could choose parents that produced segregating populations with a large genetic variance. Three biparental
soybean {Glycine max (L.) Merr.} populations were developed by crossing parents that were closely related, based on pedigree relationships. Three
additional biparental populations were developed by crossing parents that were assumed to be unrelated. The genetic variance
of each population was estimated for yield, lodging, physiological maturity, and plant height. Coefficient of parentage was
calculated for each pair of parents used to develop the segregating populations. Genetic distance was determined, based on
the number of random amplified polymorphic markers (RAPD) that were polymorphic for each pair of parents. Genetic distance
was not associated with the coefficient of parentage or the magnitude of the genetic variance. The genetic variance pooled
across the three closely related populations was smaller than the genetic variance pooled across the three populations derived
from crossing unrelated parents for all four traits that were evaluated.
Received: 24 April 1996 / Accepted: 17 May 1996 |
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Keywords: | Glycine max DNA Pedigree analysis Genetic variance |
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