Association between relationship measures based on AFLP markers, pedigree data and morphological traits in barley |
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Authors: | J W Schut X Qi P Stam |
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Institution: | (1) C.T. de Wit Graduate School for Production Ecology, Department of Plant Breeding, Wageningen Agriculture University, P.O. Box 386, 6700 AJ Wageningen, The Netherlands Fax: + 31 317 48 34 57 E-mail: johan.schut@users.pv.wau.nl, NL |
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Abstract: | Thirty one barley lines were used to investigate the agreement between three relationship measures: genetic similarities
based on 681 AFLP-markers, coefficients of co-ancestry based on pedigree data, and generalised distance based on 25 morpological
characters (morphological distance). Bootstrap analysis was used to estimate the accuracy of the correlation estimates. AFLP-based
genetic similarities showed a poor-to-moderate correlation with the coefficients of co-ancestry within the core set of 25
European two-row spring barleys. Morphological distance was not significantly correlated with either genetic similarity or
the coefficient of co-ancestry. The precision of all correlation-coefficient estimates, however, was low. The inclusion of
two European winter barleys, two North American two-row spring barleys, and two North American six-row spring barleys in the
AFLP-analysis resulted in a much stronger correlation between genetic similarity and the coefficient of co-ancestry. This
suggests good opportunities for the use of AFLP-markers to assess genetic diversity by distinguishing between the major ecotypes
of barley. Additionally, each of the eight primer combinations used in the AFLP-analysis was able to identify all 31 lines
uniquely, showing the usefulness of AFLPs for cultivar identification. Because of the inaccuracy of the investigated relationship
measures, resulting in low values of the correlation-coefficient estimates, prediction of the breeding behaviour of parent
combinations may be improved by the use of a combination of relationship measures, thus decreasing the effect of their individual
independent errors.
Received: 24 February 1997 / Accepted: 23 June 1997 |
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Keywords: | Bootstrap analysis Coefficient of co-ancestry Cultivar identification Genetic similarity Hordeum vulgare |
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