the Cellular wall. Hormonal regulation of growth of cages and synthesis of materials of a cellular wall

you are: the Cellular wall

The Important role in stimulation of growth of cages indolil-3-acetic acid (IUK) plays rostovoj a hormone auksin, or. Growth of many unripe fabrics (both in intaktnom a plant, and in culture) amplifies at addition IUK in 6 and even in 8 times. mechanism by means of which IUK stimulates a stretching of cages, long time remained a riddle, and only recently the attention has been turned on that circumstance that effect IUK can be reproduced partially, inkubiruja a fabric at low rn. The assumption From here arose that IUK activates any mechanism podkislenija, for example the ionic pump in plazmalemme, pumping over ions N +. Moving ions N + from internal area of a cage to this or that site of a cellular wall, such pump could cause local fall rn that in turn could stimulate activity of the enzymes causing razryhlenie a cellular walls as a result of rupture of communications between molecules entering into its structure. That there was a stretching of cages under the influence of osmotic forces, the strengthened absorption of water accompanied by strengthening of such processes should follow it, as cytoplasmatic synthesis of a material of a cellular wall, carrying over of this material through plazmalemmu and its inclusion in a cellular wall. Thus, and increase cellular the tourist's mountain, and biochemical changes in cellular walls are equally necessary that the stretching and growth of cages occurred continuously.

Thanks to the rigidity cellular walls provide to vegetative cages the certain form and a certain minimum size, i.e. Serve for a plant some kind of a skeleton. in cages with strong lignifitsirovannymi secondary cellular walls, for example in wood, this skeleton can provide preservation of the size and the form even in the absence of all other supporting forces. In thin-walled cages, for example in fabrics of sheet, a wall are too pliable and incapable to keep the form without support from outside cellular contents. this support is created mainly by the pressure developed vakuolju.