No luck on finding out about plasmids in relation to potatoes, because I was deluged in google results about genetic engineering in potatoes via plasmids. The Bt gene was mentioned, but since I have no interest in GMO crops, I didn't look into it. However, it brought up a different train of thought, and probably I am showing my ignorance here: if plasmids are what are transmitting the genes in GMO crops....then pollen from the GMO crops should not be able to successfully transmit those traits when cross-pollinating non-GMO crops, because plasmids are passed down in the mitochondrial DNA, via the female parent. Yet there's an awful lot of talk about GMO contamination of OP crops. I am so confused!