What is the auxin signaling pathway?

The auxin signaling pathway modulates diverse aspects of plant growth and development, such as responses to light and gravity, organ patterning, general root and shoot architecture and vascular development.

What are the steps of a hormone signaling pathway?

Cell signaling can be divided into 3 stages.

• Reception: A cell detects a signaling molecule from the outside of the cell.
• Transduction: When the signaling molecule binds the receptor it changes the receptor protein in some way.
• Response: Finally, the signal triggers a specific cellular response.

How do auxins work?

Auxins are a family of plant hormones. They are mostly made in the tips of the growing stems and roots, which are known as apical meristems, and can diffuse to other parts of the stems or roots. Auxins control the growth of plants by promoting cell division and causing elongation in plant cells (the cells get longer).

What are the 3 stages or process of cell signaling?

Three Stages of Cell Signaling First, reception, whereby the signal molecule binds the receptor. Then, signal transduction, which is where the chemical signal results in a series of enzyme activations. Finally, the response, which is the resulting cellular responses.

Is auxin stimulated by light?

Light manipulates specific responses by controlling the sensitivity of the response to auxin at specific sites in the plant. Light regulates auxin levels to influence growth at the tissue level, whereas coordinated development among organs is achieved through light control of auxin distribution through the seedling.

Does auxin inhibit root growth?

The hormone auxin is known to inhibit root elongation and to promote initiation of lateral roots.

What is auxin signaling pathway?

Of central importance is an elegantly short but versatile signaling pathway through which auxin triggers changes in gene expression. However, it is increasingly clear that this pathway is not sufficient to explain all auxin responses, and other auxin signaling systems are emerging. AUXIN BY ANALOGY

What is the role of auxin in plant growth?

Auxin triggers diverse responses in plants, and this is reflected in quantitative and qualitative diversity in the auxin signaling machinery. Auxin acts as a general coordinator of plant growth and development, transferring information over both long and short ranges.

How does auxin regulate transcription?

Auxin regulates transcription via an elegantly short signal transduction pathway, which has been extensively reviewed (Chapman and Estelle, 2009; Salehin et al., 2015) and is illustrated in Figure 1.

Is the TIR1/AFB-aux the only auxin detection system in plants?

The TIR1/AFB-Aux/IAA-ARF signaling system provides plenty of scope for diversity in auxin response, and the dramatic phenotypes of mutants compromised in this pathway attest to its importance in the coordination of plant growth and development. This begs the question as to whether this is the only auxin detection system in plants.