Figure 39.3 -Figure 39.3 Is a Northern Blot Showing the Expression of Showing

Figure 39.3

-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.