apheliotropism

[uh-fee-lee-o-truh-piz-uhm, ap-hee-lee-]

noun

1. apheliotropic tendency or type of growth.

Word History and Origins

Origin of apheliotropism¹

First recorded in 1875–80; apheliotrop(ic) + -ism

Example Sentences

Apheliotropism, or, as usually designated, negative * 'Physiologie Veg.'

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These internodes were either not old enough, or the light was not sufficiently bright, to induce apheliotropism, for both plants bent slowly towards, instead of from the window during four days.

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Finally, the conversion of circumnutation into heliotropism or apheliotropism, is closely analogous to what takes place with sleeping plants, which during the daytime describe one or more ellipses, often moving in zigzag lines and making little loops; for when they begin in the evening to go to sleep, they likewise expend all their energy in rendering their course rectilinear and rapid.

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As this latter movement occurred in complete darkness, and with peduncles arising from upright and from dependent branches, it cannot be due to apheliotropism or to epinasty, but must be attributed to geotropism.

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Whether the exciting cause of the downward movement is geotropism or apheliotropism was not ascertained; but probably it is not apheliotropism, as all the gynophores grew straight down towards the ground, whilst the light in the hot-house entered from one side as well as from above.

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