The study looked at the amount of magnesium in different types of sunflowers. They found that wild sunflower species have varying levels of magnesium, with Helianthus petiolaris having the highest and Helianthus tuberosus having the lowest. The amount of magnesium also differed within each species. Hybrid sunflowers also showed significant differences in magnesium levels. This shows that there is a lot of genetic variation in magnesium content in sunflowers, which is important to consider for their nutrition and breeding programs.