How does auxin cause cell elongation?
How does auxin cause cell elongation?
Auxin causes the elongation of stem and coleoptile cells by promoting wall loosening via cleavage of these bonds. Because exogenous acid causes a transient (1-4 h) increase in growth rate, auxin must also mediate events in addition to wall acidification for growth to continue for an extended period of time.
Does auxin promote cell division or cell elongation?
Cell wall expansion and overall cell growth is regulated via several factors, including plant hormones. Among them, auxin plays a vital role in controlling plant growth and development via promotion of cell division (proliferation), growth (expansion, elongation) and differentiation [15,16,104–108].
What promotes stem elongation in plants?
Auxins function primarily in stem elongation by promoting cell growth. Indole-3-acetic acid (IAA) is the major naturally occurring auxin and one of the major growth factors in plants. They were the first group of plant growth hormones discovered.
What do Auxins promote the growth of?
Auxins control the growth of plants by promoting cell division and causing elongation in plant cells (the cells get longer).
What happens during cell elongation?
Plant cells are also able to become longer as they grow. This process is called cell elongation and occurs throughout the plant, not just in the meristems. The cells of multicellular animals and plants must also differentiate , so that its cells develop features that enable them to fulfil specific roles.
Does auxin increase turgor pressure?
The cell wall has to be fairly rigid, to provide support and protection, but also extensible, to allow cell expansion, which is driven by a strong intracellular turgor pressure [6,7,8,9,10,11]. The plant hormone auxin is identified as a stimulator of cell elongation, as it increases cell wall extensibility [14,15,16].
Which hormone is responsible for cell elongation?
plant hormone auxin
The plant hormone auxin is well known to stimulate cell elongation via increasing wall extensibility. Auxin participates in the regulation of cell wall properties by inducing wall loosening.
Does auxin help in cell division?
Auxin promotes cell division and meristem maintenance and also plays an important role in the establishment of cellular patterning. Between two successive rounds of division, the increase in size of these cells corresponds to cell growth.
How does gibberellin cause cell elongation?
Gibberellins stimulate cell elongation by altering the rheological properties of the cell wall; as a consequence, the water potential of the cell is lowered allowing for water uptake and therefore an increase in cell volume.
Which plant hormone helps in cell division?
Cytokinins
Cytokinins promote cell division. They are produced in growing areas, such as meristems at tip of the shoot. Zeatin is a hormone in this class, and occurs in corn (Zea ).
How does auxin exert its effect on plant cells?
Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant.