Regulation of growth by light. Effects of dark blue light

you are: Regulation of growth by light

As it was already told in gl. 9, the dark blue light absorbed, apparently, flavoproteidom, can cause a phototropic bend of cylindrical bodies of a plant by an induction lateralnogo carrying over auksina which leads to non-uniform growth of body from two parties. dark blue light influences also set of other processes and parametres, such as opening ustits and the combined leaves, cytoplasm movement in cages koleoptilja oats, viscosity of cytoplasm in cages of leaves of water plant Elodea, movement hloroplastov at a duckweed (Lemna) and a cell fission plane in young sporofitah laporotnika (fig. 11.20). In all these reactions the law retsiproknosti is observed, i.e. The effect depends on the general energy and product of intensity of light for a while (I-t=K) is constant size. thus, the irradiation at relative intensity of light 100, 10 and 1 will give identical effect at duration accordingly 0,01, 0,1 and 1 with. As spectra of action for all these processes are surprisingly similar, we can conclude that the same pigment forms the same photoproduct, capable to regulate various physiological processes. The nature of this photoproduct is still unknown, though in various plants after fotoaktivatsiifla-fault dark blue light chemical restoration of certain cytochrome was revealed. In this process could participate and intermediate forms of phytochrome.

Thus, the definitive form of a green plant caused in whole its genes, is defined with the assistance of light which operates through various photoreceptors. Phytochrome can regulate germination of seeds, deetioljatsiju, flowering, subsidence of leaves and ageing. protochlorophyll regulates process pozelenenija, a chlorophyll - the general avtotrofnoe a food, and a yellow pigment (it is possible, flavoproteid) - a direction of growth of elevated bodies, and also set of thin endocellular processes. A green plant-it really the car put in action by light and living in constant close dependence on quanta falling on it.