Daisies (Bellis perennis) face the Sun after opening in the morning and will follow the Sun through the day
Heliotropism, a form of tropism, is the diurnal or seasonal motion of plant parts (flowers or leaves) in response to the direction of the Sun.
The habit of some plants to move in the direction of the Sun, a form of tropism, was already known by the Ancient Greeks. They named one of those plants after that property Heliotropium, meaning "sun turn". The Greeks assumed it to be a passive effect, presumably the loss of fluid on the illuminated side, that did not need further study.[1] Aristotle's logic that plants are passive and immobile organisms prevailed. In the 19th century, however, botanists discovered that growth processes in the plant were involved, and conducted increasingly in-depth experiments. A. P. de Candolle called this phenomenon in any plant heliotropism (1832).[2] It was renamed phototropism in 1892, because it is a response to light rather than to the sun, and because the phototropism of algae in lab studies at that time strongly depended on the brightness (positive phototropic for weak light, and negative phototropic for bright light, like sunlight).[3][4] A botanist studying this subject in the lab, at the cellular and subcellular level, or using artificial light, is more likely to employ the more abstract word phototropism, a term which includes artificial light as well as natural sunlight. The French scientist Jean-Jacques d'Ortous de Mairan was one of the first to study heliotropism when he experimented with the Mimosa pudica plant. The phenomenon was studied by Charles Darwin and published in his penultimate 1880 book The Power of Movement in Plants, a work which included other stimuli to plant movement such as gravity, moisture and touch.
^Whippo, Craig W. (2006). "Phototropism: Bending towards Enlightenment". The Plant Cell. 18 (5): 1110–1119. doi:10.1105/tpc.105.039669. PMC 1456868. PMID 16670442.
^Hart, J.W. (1990). Plant Tropisms: And other Growth Movements. Springer. p. 36. ISBN 9780412530807. Retrieved 2012-08-08.
^"Phototropism and photomorphogenesis of Vaucheria".
^Donat-Peter Häder; Michael Lebert (2001). Photomovement. Elsevier. p. 676. ISBN 9780080538860. Retrieved 2012-08-08.
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tilt during the day to face the Sun. This movement is referred to as heliotropism, which continues for a short time when flower buds form and young Helianthus...
impression that the flowers are tracking the Sun. This alignment results from heliotropism in an earlier development stage, the young flower stage, before full...
or growth in response to gravity Apogeotropism: negative geotropism Heliotropism: the diurnal motion or seasonal motion of plant parts in response to...
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circadian clock in sunflower heliotropism, or solar tracking. The sunflower's long stem made it easy to identify its heliotropism. Following the sun's location...
daisy'. It blooms from March to September and exhibits the phenomenon of heliotropism, in which the flowers follow the position of the sun in the sky. The...
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in wet alpine meadows, cliffs and streamsides. It displays prevalent heliotropism, thus gaining an advantage in its harsh, cold environment through capturing...
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realization of the “pursuit of cheerfulness”, which they described as heliotropism, comparing it to works by Fujiko F. Fujio and Tetsuya Chiba, providing...
borne away on the wind. The fruit is an achene. Some flowers exhibit heliotropism, changing orientation to follow the sun. Others grow toward the position...
naturally focused on seaside and coastal resorts. Under the gentle name of heliotropism, encouraged by a culture that values shellfish, whole crowds flock to...
computers have for kids...You know how flowers follow the sun? That's called heliotropism. Well, kids have a 'computertropism'". He "lobbied his bosses" to allow...
vicinity of the site. In Freiburg im Breisgau, Germany, Rolf Disch built the Heliotrop in 1996, a residential building that is rotating with the sun and has...
Thenard on the discovery of the amides of metal (1809); Candolle on heliotropism (1817). Equally important was the special thread, woven into the overall...
refrangible rays of the spectrum on the rate of growth; his research on heliotropism and geotropism, in which he introduced the clinostat; his work on the...
Médicine et Hygiene 1989 Gastaut's syndrome: Photosensitive epilepsy with heliotropism and arm rocking. Lennox-Gastaut syndrome: An epileptic condition with...
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