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Daily and infradian rhythms of circumnutation intensity in Helianthus annuus by Agnieszka Buda; Tadeusz Zawadzki; Maciej Krupa; Maria Stolarz; Witold Okulski is a Agricultural and Biological Sciences article available to read on EtoBox.

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**Circumnutation in __Helianthus annuus__ L. was investigated by measurements lasting 4–7 weeks using a picture analysis system. The rhythmicity of circumnutation vigour (intensity) with regard to the trajectory length and period of individual circumnutations were examined. Three photoperiod conditions were applied [light/dark (LD), continuous light (LL) and LD followed by LL]. Data were processed by the Fourier analysis. Statistical analysis included the examination of circumnutation mean frequencies and correlation tests. Both parameters, trajectory length and period, revealed a daily (24 h) modulation in LD with a weak correlation between them, whereas in LL no daily modulation of the parameters was observed. After LD–LL transition, the parameters were gradually losing their daily modulation. Despite a very strong modulation of the trajectory length in LD, the period was quite stable in all groups tested, but only in LD were there no statistical differences in the number of circumnutations per 24 h among the plants studied. LD was concluded to be the strong synchronizer, making the plants circumnutate regularly. Regardless of the presence or absence of daily modulation, the infr

Who reads Daily and infradian rhythms of circumnutation intensity in Helianthus annuus?

Author

Agnieszka Buda; Tadeusz Zawadzki; Maciej Krupa; Maria Stolarz; Witold Okulski

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0031-9317)

Published

2003

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)