Thursday, February 15, 2007

Introduction to Hormone No.2 Auxins

Welcome back to part 2 of our journey towards understanding more about how plant hormones work in our fellow plantlike friend's lives.

Today, I shall share with you something about the plant hormone, Auxins.

Auxins play an essential role in the coordination of many growth and behavioral processes a plant's life cycle.

Functions

To cause growth in the required domains, Auxins must preferentially be active in them(since Auxins are not synthesized everywhere). Each cell has the potential ability to do so, but Auxin synthesis will only be activated under specific conditions. For growth purposes, not only do Auxins have to be translocated toward the specific sites where they are needed, but there has to be an established mechanism to detect those sites. Translocation is driven throughout the plant body primarily from peaks of shoots to peaks of roots.

promote uniform flowering

promote fruit set

prevent premature fruit drop

Used in high doses, auxin stimulates the production of ethylene. Excess ethylene can inhibit elongation growth, cause leaves to fall (leaf abscission), and even kill the plant

It induces formation and organization of phloem and xylem. When the plant is wounded, Auxin can induce cell differentiation and regeneration of the vascular tissues.

Effects

The plant hormone stimulates cell elongation. It stimulates the Wall Loosening Factors, for example, elastins, to loosen the cell walls

It stimulates cell division if cytokinins are present

It induces sugar and mineral accumulation at the site of application.

So today, we have learnt about the plant's amazing ability to create and repair new cells. Imagine the great things we can do if we can harness this exceptional ability and apply it to the human anatomy. We can modify the hormone such that its effects can be quickly seen. Think of the impact it would have on medical science. Wouldn't it be cool if we could see our fresh new wound healing right before our eyes?

So I'll leave you to think along this line and maybe you can share with me how you think this particular hormones can revolutionize the way we live. Until next time, this is you plant guru.
Signing off.....

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