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Pattern analysis of the diversity of morphological plant attributes and herbage yield in a world collection of white clover (trifolium repens L.) germplasm characterised in a summer moisture stress environment of Australia

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Abstract

Information on the variation available for different plant attributes has enabled germplasm collections to be effectively utilised in plant breeding. A world sourced collection of white clover germplasm has been developed at the White Clover Resource Centre at Glen Innes, New South Wales. This collection of 439 accessions was characterised under field conditions as a preliminary study of the genotypic variation for morphological attributes; stolon density, stolon branching, number of nodes, number of rooted nodes, stolon thickness, internode length, leaf length, plant height and plant spread, together with seasonal herbage yield. Characterisation was conducted on different batches of germplasm (subsets of accessions taken from the complete collection) over a period of five years. Inclusion of two check cultivars, Haifa and Huia, in each batch enabled adjustment of the characterisation data for year effects and attribute-by-year interaction effects. The component of variance for seasonal herbage yield among batches was large relative to that for accessions. Accession-by-experiment and accession-by-season interactions for herbage yield were not detected. Accession mean repeatability for herbage yield across seasons was intermediate (0.453). The components of genotypic variance among accessions for all attributes, except plant height, were larger than their respective standard errors. The estimates of accession mean repeatability for the attributes ranged from low (0.277 for plant height) to intermediate (0.544 for internode length).

Multivariate techniques of clustering and ordination were used to investigate the diversity present among the accessions in the collection. Both cluster analysis and principal component analysis suggested that seven groups of accessions existed. It was also proposed from the pattern analysis results that accessions from a group characterised by large leaves, tall plants and thick stolons could be crossed with accessions from a group that had above average stolon density and stolon branching. This material could produce breeding populations to be used in recurrent selection for the development of white clover cultivars for dryland summer moisture stress environments in Australia. The germplasm collection was also found to be deficient in genotypes with high stolon density, high number of branches, high number of rooted nodes and large leaves. This warrants addition of new germplasm accessions possessing these characteristics to the present germplasm collection.

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Authors and Affiliations

  1. Department of Agriculture, the University of Queensland, Brisbane, Qld, 4072, Australia

    M.Z.Z. Jahufer & M. Cooper

  2. Csiro, Mathematical & Information Sciences, Pmb 2, Glen, Osmond, Sa, 5062, Australia

    B.D. Harch

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  1. M.Z.Z. Jahufer
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  2. M. Cooper
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  3. B.D. Harch
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Jahufer, M., Cooper, M. & Harch, B. Pattern analysis of the diversity of morphological plant attributes and herbage yield in a world collection of white clover (trifolium repens L.) germplasm characterised in a summer moisture stress environment of Australia. Genetic Resources and Crop Evolution 44, 289–300 (1997). https://doi.org/10.1023/A:1008692629734

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