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The Effects of Light Breaks in the Dark Period on Flower-bud Development in Varieties of Phaseolus vulgaris L.

D. G. MORGAN and M. S. ZEHNI
Annals of Botany
Vol. 46, No. 1 (July 1980), pp. 37-42
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/42761344
Page Count: 6
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The Effects of Light Breaks in the Dark Period on Flower-bud Development in Varieties of Phaseolus vulgaris L.
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Abstract

A light break imposed in the middle of, or more effectively, two-thirds of the way through a 13 h dark period inhibited the development of the first initiated flower buds and reduced the production of open flowers in two daylength-sensitive varieties of Phaseolus vulgaris. The effects were similar to those of a long photoperiod applied continuously and therefore provide clear evidence of the importance of the dark period in mediating the effects of daylength on flower-bud development in the two varieties.

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