hyponasty

American  

[hahy-puh-nas-tee] / ˈhaɪ pəˌnæs ti /

noun

Botany.

1. increased growth along the lower surface of a plant or plant part, causing it to bend upward.

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hyponasty British  

/ ˈhaɪpəˌnæstɪ /

noun

1. increased growth of the lower surface of a plant part, resulting in an upward bending of the part Compare epinasty

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Other Word Forms

• hyponastic
  adjective
• hyponastically
  adverb

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Etymology

Origin of hyponasty

1870–75; hypo- + Greek nast ( ós ) pressed close, compact + -y ³

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Example Sentences

See Examples For:

hyponasty

The hooking depends chiefly, as far as we could ascertain, on the tip being affected by epinasty and geotropism; the lower and older parts continually straightening themselves through hyponasty and apogeotropism.

From The Power of Movement in Plants by Charles Darwin

There can therefore be no doubt that the straightening of the abruptly curved portion of the growing stem of this plant, which appears to be wholly due to hyponasty, is the result of modified circumnutation.

From The Power of Movement in Plants by Charles Darwin

As this upward movement occurred with plants kept in the dark and in whatever position the main peduncle was fastened, it could not have been caused by heliotropism or apogeotropism, but by hyponasty.

From The Power of Movement in Plants by Charles Darwin

We will therefore speak of circumnutation, which is always in progress, as modified by epinasty, hyponasty, geotropism, or other agencies, whether internal or external.

From The Power of Movement in Plants by Charles Darwin

As the rectangularly bent portion of an upright stem grows older, the lower part straightens itself; and this is effected through hyponasty.

From The Power of Movement in Plants by Charles Darwin

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