Secondary Growth in Roots

In the dicot root, the vascular cambium is completely secondary in origin.

It originates from the tissue located just below the phloem bundles, a portion of pericycle tissue

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Integrins are involved in biological activities, includes: 

Extravasation

Cell-to-cell adhesion

Cell migration

Receptors for certain viruses

Angiogenesis

Apoptosis

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Integrins can mediate outside-in and inside-out signaling

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Outside-in signaling

Binding of integrins to their ligands induces conformational changes in their cytoplasmic domains, directly or indirectly altering their interactions with cytoplasmic proteins

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Inside-out signaling

intracellular signaling pathways can, via adapter proteins, modify the ability of integrins to bind

to their extracellular ligands

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Integrin exist in two conformations: 

Inactive, low-affinity, “bent” conformation  

Active, high-affinity, “extended” conformation

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Activation of integrins involves:

Conformational changes near the propeller and 

 βA domains

Separation of the transmembrane and cytoplasmic domains