Abstract
THERE is some controversy on the proportion of lucerne flowers which set seed without tripping; but all investigators have agreed that tripping is essential for high yield of seed. Insect-tripped florets bring about cross-pollination and normally cross-fertilization, while seed setting without tripping or due to automatic tripping results usually in self-pollination and self-fertilization. The population of wild bees, although playing a most effective part in tripping and crossing, is inadequate. The importance of honey bees in tripping has been one of the most controversial subjects; but a number of investigators1–3 showed that pollen-gathering bees caused a high percentage of tripping and nectar-gathering bees caused only accidental tripping.
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References
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ZALESKI, A. Tripping, Crossing and Selfing in Lucerne Strains. Nature 177, 334–335 (1956). https://doi.org/10.1038/177334a0
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DOI: https://doi.org/10.1038/177334a0
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