What is "apogeotropic"

Usage examples of "apogeotropic".

The upper part is apogeotropic, and therefore grows vertically upwards, excepting a short portion close to the blades, which at an early period bends downwards and becomes arched, and thus breaks through the ground.

But in this latter case the lateral shoots are rendered apogeotropic, whereas with radicles the lateral ones are rendered geotropic.

Thirdly and lastly, radicles when they first protrude from the seed are always geotropic, and plumules or shoots almost always apogeotropic.

Plants, also, were selected which were but feebly geotropic or apogeotropic, or had become so from having grown rather old.

Cytisus fragrans: apogeotropic movement of stem from 10o beneath to 60o above horizon, traced on vertical glass, from 8.

Beta vulgaris: apogeotropic movement of hypocotyl from 19o beneath horizon to a vertical position, with subsequent circumnutation, traced on a vertical and on a horizontal glassplate, from 8.

The cotyledons of this plant, after the first leaf has begun to protrude, are but slightly apogeotropic, though they still continue to circumnutate.

In this diagram the several stages may be followed by which an almost rectilinear, upward, apogeotropic course first becomes zigzag, and then changes into a circumnutating movement, with most of the successively formed, irregular ellipses directed upwards.

Lilium auratum: apogeotropic movement of stem, traced on a vertical glass during 2 days and 2 nights, from 10.

Here then we have a graduated change from a straight upward apogeotropic course into circumnutation, instead of an abrupt change, as in the former case.

Phalaris Canariensis: apogeotropic movement of cotyledon, traced on a vertical and horizontal glass, from 9.

Brassica oleracea: apogeotropic movement of hypocotyl, traced on vertical glass, from 9.

Several other analogous cases were casually observed, and in all of them the apogeotropic movement could be seen to consist of modified circumnutation.

Heliotropism, showed in the plainest manner that apogeotropic and geotropic, and probably diageotropic movements, are all modified forms of circumnutation.

Brassica oleracea, movement of buried and arched hypocotyl, 13, 14, 15 --, conjoint circumnutation of hypocotyl and cotyledons, 16, 17, 18 --, of hypocotyl in darkness, 19 --, of a cotyledon with hypocotyl secured to a stick, 19, 20 --, rate of movement, 20 --, ellipses described by hypocotyls when erect, 105 --, movements of cotyledons, 115 --, -- of stem, 202 --, -- of leaves at night, 229, 230 --, sleep of cotyledons, 301 --, circumnutation of hypocotyl of seedling plant, 425 --, heliotropic movement and circumnutation of hypocotyls, 426 --, effect of lateral light on hypocotyls, 479482 --, apogeotropic movement of hypocotyls, 500, 501 Brassica rapa, movements of leaves, 230 Brongniart, A.