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Selection for height of nectar in the corolla tube of English singlecut Red Clover

Published online by Cambridge University Press:  27 March 2009

R. P. Hawkins
Affiliation:
National Institute of Agricultural Botany, Cambridge

Summary

Pollination of red clover by honey bees would be expected to increase if varieties could be produced in which the nectar is within 7 mm of the mouth of the corolla tube and so within the bee's reach.

Pollination by honey bees in a small glasshouse increased the height of nectar in the resulting stock of red clover but when this was again pollinated by honey bees there was no further increase.

Selection of plants with above average nectar height ultimately produced a stock in which the nectar height was 0·76 mm higher than in the original; a difference which was significant. There was also a considerable and significant increase in the proportion of florets with nectar within 7 mm of the mouth of the corolla tube.

It was concluded that the height of nectar can be increased by selection; this would be of particular value for the pollination of red clover varieties with long corolla tubes grown for seed where there are insufficient numbers of bumble bees.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1971

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References

REFERENCES

Åkerberg, . et alia. (1963). Induced polyploids as foddercrops. Recent Plant Breeding Research Svälof 1946–1961, pp. 125–48. Stockholm: Almquist and Wiksell.Google Scholar
Bond, D. A. & Fyfe, J. I. (1968). Corolla tube length and nectar height of F. 1 red clover plants (Trifolium pratense) and their seed yields following honey bee pollination. J. agric. Sci., Camb. 70, 510.Google Scholar
Dade, E. (1967). Sampling red clover for nectar yield components and corolla tube length. Crop Sci. 7 (2), 160–62.CrossRefGoogle Scholar
Damisch, W. (1963). Weber den Einfluss biologoischer Faktoren auf den Samensatz. Biol. Zbl 82 (3), 303–41.Google Scholar
Dennis, B. A. & Hass, H. (1967). Pollination and seed setting in diploid and tetraploid red clover (Trifolium pratense L.) under Danish conditions. II. Studies of floret morphology in relation to the working speed of honey bees and bumble bees (Hymenoplera apoidae). K. Vet.-og. Landbohojsk. Årsshr. 1967, 118–33.Google Scholar
Hawkins, R. P. (1958). A survey of late flowering and singlecut red clover seed crops. J. nat. Inst. agric. Bot. 8, 450–61.Google Scholar
Hawkins, R. P. (1961). Observations on the pollination of red clover by bees. 1. The yield of seed in relation to the numbers and kinds of pollinators. Ann. appl. Biol. 49, 5565.CrossRefGoogle Scholar
Hawkins, R. P. (1969). Length of tongue in a honey bee in relation to the pollination of red clover. J. agric. Sci., Camb. 73, 489–93.Google Scholar
Jablonski, B. (1962). Proba oceny nectarowania konicz czerwonej przy selekcji norwych odmian. (Improvements in nectar contents estimations in hybrids of red clover.) Pszczel. Zesz. nauk. 6 (2).Google Scholar
Kopel'Kievskii, G. V. (1964). Increasing the nectar productivity of entomophilous plants by selection. Trudy nauchno-issled Inst. Pchelovodstva (1964), 176–89.Google Scholar
Kress, H. & Fuchs, A. (1959). Über den züchtungswert von Rotkleeformen mitKurzer Blütenrohre. (The breeding value of red clover forms with short corolla tubes.) Z. Pfl. Zūcht 41, 167–94.Google Scholar
Skirde, W. (1963). Morphologische und Sekretorische untersuchungen an Di-und Tetraploidam Klee. (Investigations into the morphology and secretion in diploid and tetraploid clover.) Ann. Agric. Fenn. 2, 7390.Google Scholar
Starling, T. M. & Wilsie, C. P. & Gilbert, W. W. (1950). Corolla tube length studies in red clover. Agron. J. 42 (1), 18.CrossRefGoogle Scholar