If Gus is present in the Arabidopsis Thaliana what is it indicating? I know its to show gene expression, but what is the importance of that?

Human Anatomy & Physiology (11th Edition)
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If Gus is present in the Arabidopsis Thaliana what is it indicating? I know its to show gene expression, but what is the importance of that? I hope this makes sense 

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Marker genes have a significant role in recombinant DNA technology-based transgenic plant production and assessment of expression patterns of an experimental gene. GUS is a reporter gene introduced into Arabidopsis thaliana to observe the expression of a gene(s) of interest in different regions of the plant body. The GUS gene encodes the beta-glucuronidase enzyme, which turns the chromogenic substance X-gluc into a blue-coloured product.

Thus, the production of this colour by the activity of the GUS gene is an indication of experimental gene expression.

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