meaning of "initial gene constructions" vs. "under the control of plant promoters" in an article on GM plants
So basically, most plasmids that you buy have an antibiotic resistance marker, I think it's relatively standard, because you want to know which bacteria were transformed, right? Ergo, the initial cloning vectors being used. These markers are under control of a plasmid promoter like T7, for example, not a plant promoter (unless you contsructed it de novo to do this). But your plasmid is going to have a cloning site where you can make a cut, insert more DNA, and ligate it back together. 

At least pursuant to the patent by Monsanto here, my assumption is that if you're looking to modify plants, your insert for the cloning site is probably a plant promoter, followed by a structural gene, and then a UTR sequence. I think what the authors are saying is that some groups put an antibiotic resistance gene into the insert as the structural part, and when you use something like an A. tumefaciens system to integrate that vector into the plant genome, you end up with an antibiotic structural gene under the control of a plant promoter. You should keep in mind that the whole plasmid gets integrated, but not all of it is transcribed by the plant, only that within the transcribed region controlled by a promoter the plant can utilize!!*

*I'll add, what they're worrying about in the linked OP article, is that whether or not the plant is actively producing antibiotic proteins, that the sequence for the antibiotic resistance has been introduced at any point in the plant's genome carries the risk that some bacteria will randomly obtain it through horizontal gene transfer.