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Figure 39.3 is a Northern blot showing the expression of Myb mRNA in cultured aleurone layer cells ...

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Figure 39.3 is a Northern blot showing the expression of Myb mRNA in cultured aleurone layer cells ...

Figure 39.3 is a Northern blot showing the expression of Myb mRNA in cultured aleurone layer cells that were treated with gibberellin versus control cells that were not treated with gibberellin. Only the gibberellin-treated cells expressed the Myb mRNA, but the Myb mRNA was not detectable until 6-12 hours after gibberellin application. Why did it take so long?
A) Gibberellin had to bind to a receptor and initiate a signal transduction cascade that, in turn, had to activate a transcription factor that triggered the transcription of the Myb gene.
B) Gibberellin had to diffuse into the aleurone layer cells and be metabolized in order to trigger activation of a transcription factor that triggered transcription of the Myb gene.
C) Gibberellin had to enter the cells and find the Myb gene among the large plant genome.

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Biological Science, Canadian Edition

Edition: 2^nd

Authors: Freeman, Shar, Harrington

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