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Movements of Helianthus annuus Leaves and Heads

A. R. G. Lang and J. E. Begg
Journal of Applied Ecology
Vol. 16, No. 1 (Apr., 1979), pp. 299-305
DOI: 10.2307/2402749
Stable URL: http://www.jstor.org/stable/2402749
Page Count: 7
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Movements of Helianthus annuus Leaves and Heads
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Abstract

(1) Diurnal movements of heads and leaves of sunflower (Helianthus annuus cv Hysun 30) were determined from three-dimensional maps of the organs. (2) Diurnal E-W oscillations of the heads occurred initially but ceased as the flowers opened and anthesis commenced, leaving the heads facing east. The amplitude of the leaf movements also diminished with time. (3) The easterly aspect of the heads reduced the maximum temperature of the florets; this may increase seed set.

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