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Rhythmic Leaf Movements of Some Common Weeds

Published online by Cambridge University Press:  12 June 2017

Robert N. Andersen  and
Willard L. Koukkari
Robert N. Andersen
Affiliation:
U.S. Dep. Agric., Sci. Ed. Admin., Agric. Res., Dep. Agron. and Plant Genetics, Univ. of Minnesota, St. Paul, MN
Willard L. Koukkari
Affiliation:
Dep. Bot., Univ. of Minnesota, St. Paul, MN 55108
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Abstract

In growth chamber studies, we measured the movement of cotyledons and leaves or leaflets in seedlings of nine weed species to determine: the magnitude of movement, whether movements followed a rhythmic pattern, and if rhythmic movements were endogenously controlled. Seedlings were always entrained under a 15-h light:9-h dark regime. Measurements were made at 3-h intervals for 3 to 4 days under four light regimes: alternating 15-h light:9-h dark; continuous light; one 15-h light:9-h dark span, followed by continuous light; and a 15-h light:9-h dark regime, in which the dark span was advanced 9 h (phase shift) when measurements were begun. No clearly defined pattern of leaf movement was found in wild mustard [Brassica kaber (DC.) L. C. Wheeler var. pinnatifida (Stokes) L. C. Wheeler]. Daily rhythmic leaf movements that did not appear to be endogenously controlled were found in redroot pigweed (Amaranthus retroflexus L.) and black nightshade (Solanum nigrum L.). Circadian rhythmic leaf movements that appeared to be under endogenous control were found in jimson-weed (Datura stramonium L.), common lambsquarters (Chenopodium album L.), common cocklebur (Xanthium pensylvanicum Wallr.), prickly sida (Sida spinosa L.), sicklepod (Cassia obtusifolia L.), and coffee senna (Cassia occidentalis L.).

Keywords

Endogenouscircadian rhythmBrassica kaberAmaranthus retroflexusSolanum nigrumDatura stramoniumChenopodium albumXanthium pensylvanicumSida spinosaCassia obtusifoliaCassia occidentalis
Type
Research Article
Information
Weed Science , Volume 27 , Issue 4 , July 1979 , pp. 401 - 415
Copyright
Copyright © 1979 by the Weed Science Society of America 

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References

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