Search results
Results from the WOW.Com Content Network
This auxin-stimulated intake of water causes turgor pressure on the cell walls, causing the plant to bend. Auxin stimulates cell elongation by stimulating wall-loosening factors, such as expansins, to loosen cell walls. The effect is stronger if gibberellins are also present. Auxin also stimulates cell division if cytokinins are present.
Incoming light causes more auxin to flow from the exposed side to the shaded side, increasing the concentration of auxin on the shaded side and thus more growth occurring. [12] Fourth model. In the fourth model it shows the plant receiving light to inhibit auxin basipetal down to the exposed side, causing the auxin to only flow down the shaded ...
Within the 20-year timespan, many scientists have actively contributed to examining and reevaluating Hager's acid-growth hypothesis. Despite the accumulation of observations that evidently identify the final target of the auxin-induced action to be H +-ATPase, which excretes H + protons to the apoplast and take in K + ions through its rectifying K + channel in the following years, the ...
The apical bud produces a plant hormone, auxin , that inhibits growth of the lateral buds further down on the stem towards the axillary bud. Auxin is predominantly produced in the growing shoot apex and is transported throughout the plant via the phloem and diffuses into lateral buds which prevents elongation. [2]
Lack of the plant hormone auxin can cause abnormal growth (right) Plant hormones (or phytohormones ) are signal molecules , produced within plants , that occur in extremely low concentrations . Plant hormones control all aspects of plant growth and development, including embryogenesis , [ 1 ] the regulation of organ size, pathogen defense, [ 2 ...
A typical sequence leading up to this would involve the introduction of a plant hormone (auxin, for example) that causes protons (H + ions) to be pumped out of the cell into the cell wall. As a result, the cell wall solution becomes more acidic. It was suggested by different scientist that the epidermis is a unique target of the auxin but this ...
On exposure to sunlight, auxin in the banana migrates from the sunlight side to the shaded side. Since auxin is a powerful plant growth hormone, the increased concentration promotes cell division and causes the plant cells on the shaded side to grow. [13] This asymmetrical distribution of auxin is responsible for the upward curvature of the banana.
A uniform concentration of auxin causes the root to grow straight down. This is a form of positive gravitropism where the root grows along the gravity vector. Should the root lie horizontally, then the statoliths will displace sideways to the cell membrane and induce a change in auxin distribution that triggers the root to bend and grow ...