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Variation at isozyme loci inTriticeae

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Abstract

An electrophoretic comparison of variation at 16 presumptive isozyme gene loci was performed for 17 species from the tribeTriticeae. Included in the analysis were annuals and perennials, and self- and cross-pollinating species, representing the H, I, P, N, R, V, S, E, J, J1J2, A, B, and D genomes. Perennial species were found to contain a significantly (marginally, at the 5% level) higher proportion of polymorphic loci and level of heterozygosity, than annual species. There were no significant differences between self- and crosspollinating species. Across all species, mean heterozygosity levels ranged from 0–0.225 and the % polymorphic loci from 6.3–56.3%. Genetic distance estimates varied from 0.08–0.39 for congeneric species. Relationships were deduced between the 17 species using phenetic and cladistic analyses and compared with relationships inferred from other parameters such as morphology and nucleotide sequence data. In general, the trees derived from the various relationships were concordant; the evolutionary basis for minor discrepancies between trees is also discussed.

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  1. Population Genetics Group, Research School of Biological Sciences, Australian National University, P.O. Box 475, 2601, Canberra, ACT, Australia

    C. L. McIntyre

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McIntyre, C.L. Variation at isozyme loci inTriticeae . Pl Syst Evol 160, 123–142 (1988). https://doi.org/10.1007/BF00936714

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