What is "apogeotropism"

Usage examples of "apogeotropism".

But from observing the effects of placing plants in the dark, in which case several shoots became in two or three days upright or nearly upright, and when brought back into the light again became rectangularly curved, we believe that the bending is in part due to apheliotropism, apparently somewhat opposed by apogeotropism.

Means of observation--apogeotropism--Cytisus--Verbena--Beta--Gradual conversion of the movement of circumnutation into apogeotropism in Rubus, Lilium, Phalaris, Avena, and Brassica--apogeotropism retarded by heliotropism--Effected by the aid of joints or pulvini--Movements of flowerpeduncles of Oxalis--General remarks on apogeotropism--Geotropism--Movements of radicles--Burying of seedcapsules--Use of process--Trifolium subterraneum--Arachis--Amphicarpaea--Diageotropism--Conclusion.

As the tips of the cotyledons of Phalaris and Avena bend upwards through the action of apogeotropism before the basal part, and as these same tips when excited by a lateral light transmit some influence to the lower part, causing it to bend, we thought that the same rule might hold good with apogeotropism.

As the arched epicotyl, in whatever position it may be placed, bends quickly upwards through apogeotropism, and as the two legs tend at a very early age to separate from one another, as soon as they are relieved from the pressure of the surrounding earth, it was difficult to ascertain positively whether the epicotyl, whilst remaining arched, circumnutated.

As soon as any part of the arch protrudes from the seedcoats it is acted upon by apogeotropism, and both the legs bend upwards as quickly as the surrounding earth will permit, until the arch stands vertically.

Vicia faba, circumnutation of radicle, 29, 30 --, of epicotyl, 3133 --, curvature of hypocotyl, 92 --, sensitiveness of apex of radicle, 132134 --, of the tips of secondary radicles, 154 --, of the primary radicle above the apex, 155158 --, various experiments, 135143 --, summary of results, 143151 --, power of an irritant on, compared with that of geotropism, 151154 Vicia faba, circumnutation of leaves, 233235 --, circumnutation of terminal leaflet, 235 --, effect of apogeotropism, 444 --, effect of amputating the tips of radicles, 523 --, regeneration of tips, 526 --, short exposure to geotropic action, 527 --, effects of amputating the tips obliquely, 528 --, of cauterising the tips, 529 --, of grease on the tips, 534 Vines, Mr.

In whatever position the seed may be embedded in the earth or otherwise fixed, both legs of the arch bend upwards through apogeotropism, and thus rise vertically above the ground.

From some unknown cause it had grown up through the soil in an inclined direction, and now through apogeotropism it moved during nearly 24 h.

This apparently was due to epinasty and not to apogeotropism, for the apex, soon after passing the perpendicular, curved so rapidly downwards that we could not doubt that the movement was at least aided by geotropism.

With respect to apogeotropism, De Vries maintains that it generally comes into play, and of this fact we shall presently advance some indirect evidence.

Some other agency, however, besides apogeotropism, must come into play, either directly or indirectly, in this upward movement.

Is it not possible, or even probable, that leaves and cotyledons, which have moved upwards in the evening through the action of apogeotropism during countless generations, may inherit a tendency to this movement?

We wished therefore to learn whether this was wholly due to apogeotropism, or whether an organ after bending towards the light tended from any other cause to bend from it, as soon as the light failed.

In this position they could not be acted on by apogeotropism, and if they possessed any tendency to straighten themselves or to bend in opposition to their former heliotropic curvature, this would be exhibited, for it would be opposed at first very slightly by apogeotropism.

Thurgau found that a stem which is bending heliotropically is at the same time striving, through apogeotropism, to raise itself into a vertical position.