An 8 day old seedling’s response to 100 Gy Gamma

These seedlings carry Phil’s pBRCA1:LUC construct.  The movie begins at 1 hr after irradiation and ends at 8hr 40 min. 

We see: the BRCA1 transcript is induced in tissues that are undergoing DNA replication- including endoreduplicating tissues.  However, not all tissues express the gene with the same time course. I wonder why not? I especially enjoy the appearance of the lateral root tip primordia, late in the course of the experiment.