Some varieties of Papaver somniferum L. with changed morphinane alkaloid content

Plants with a genetically determined low morphine content have been studied. During two years one spontaneous mutant has produced a morphine content in opium of 2 per cent and 0.03 per cent in dry, ripe capsules. Other alkaloids are only found in trace amounts. At least 9 per cent cross pollination occurred in Papaver somniferum as a two year average. Another spontaneous mutant has been isolated with a low production of morphine and a high thebaine content. The fresh latex of this mutant shows a reddish colour.