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Selection for seedling vigour in Festuca arundinacea

Published online by Cambridge University Press:  27 March 2009

J. S. Faulkner ,
Fiona Johnston  and
D. M. P. McAneney
J. S. Faulkner
Affiliation:
Northern Ireland Plant Breeding Station, Loughgall, Armagh, BT61 8JB
Fiona Johnston
Affiliation:
Northern Ireland Plant Breeding Station, Loughgall, Armagh, BT61 8JB
D. M. P. McAneney
Affiliation:
Northern Ireland Plant Breeding Station, Loughgall, Armagh, BT61 8JB
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Summary

Two sets of experiments were carried out to compare methods of selecting Festuca arundinacea (tall fescue) for improved seedling vigour.

In the first, germination and seedling growth of four varieties (Goar, Lironde, S. 170, and ZW 42–6) were compared in hydroponic growth tanks. From each variety, groups of seedlings were selected for each of four vigour characters (speed of germination, leaf length, root length and speed of production of the second leaf) and a fifth group was selected at random as a control. Plants of each group were intercrossed in isolation and their progeny compared.

In the second, S. 170 was studied through two cycles of selection in a soil-based compost. In the first cycle, groups of seedlings were selected for each of five characters (speed of emergence, leaf length, and speed of production of the second leaf, first axillary tiller and coleoptile tiller). Two further groups were selected randomly. In the second cycle, the progeny of each group were reselected for the same character as their parents. Both first- and second-cycle progeny were compared among themselves.

Significant direct responses to selection were obtained in all characters except speed of germination in hydroponics. Indirect responses also occurred but were mostly smaller and in response to selection for a related character, e.g. selection for early tillering resulted in early second leaves and vice versa. Two cycles of selection raised the frequency of coleoptile tillers from about 5 to 55 %, but the concomitant advances in vigour characters were smaller than those achieved by direct selection. It is argued that for practical purposes the basic criterion in selecting for improved seedling vigour should be rapid attainment of a particular growth stage such as appearance of the first tiller. Since speed of emergence itself responded to selection, the attainment of such a stage should be related to date of sowing rather than of emergence or germination.

In the progeny of the hydroponic selections, all characters showed significant varietal differences, some of them the reverse of differences between the parent populations of the varieties. These results illustrated the importance of seed provenance as a determinant of seedling vigour, and suggest that choice of parent material is important in breeding for improved vigour.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 99 , Issue 1 , August 1982 , pp. 173 - 184
Copyright
Copyright © Cambridge University Press 1982

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