Summary
An objective screening procedure was needed which would enable separation of F1 hybrids between Poa ampla and P. pratensis for use in a plant breeding programme from maternal-type offspring. Data from a cloned plant field trial were used in canonical analysis of discriminance, principal components analysis and principal co-ordinate analysis; a measure of Euclidean distance was also computed.
The relationship between hybrid, maternal and parent biotypes appeared remarkably consistent from the three forms of analysis over the first two axes of variation and to a lesser extent on the third axis. Euclidean distances were very highly correlated with the positions of clones on the first axis of variation in each of the analyses. Maternal clones were clearly separated from hybrids by each of these four methods and this distinction was supported by a more subjective visual assessment made in the field.
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Williamson, C., Killick, R. Multivariate methods as an aid in identifying Poa ampla × P. Pratensis hybrids from maternal-type offspring. Heredity 41, 215–225 (1978). https://doi.org/10.1038/hdy.1978.90
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DOI: https://doi.org/10.1038/hdy.1978.90
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