First a little biology.
Plants take up CO2 through pores on the underside of leaves called stomates or stomata. Pic: Tomato leaf stomate.
Roundup remains in the plant until the plant dies when it is incorporated into soil. There, I am assured ‘it degrades and becomes harmless’. However, if the plant is not actively growing, Roundup lurks for months until there is a growth spurt and then it works. Roundup does not degrade while in the plant.
The next fact about Roundup is that it enters stomates of all plants so even in so called Roundup Ready plants, the poison permeates every cell in the plant and there the Roundup stays. Now this is the question I have asked and asked and have never received an answer.
Roundup has revolutionised agriculture and is a must-have tool for non-till or low-till sustainable broadacre farming. But considering that we already ingest so many toxins from our polluted environment, is engineering edible plants to be ‘Roundup Ready’ taking GM one step too far?