Flat of Potato Plants (IMAGE) American Society of Agronomy Caption Using this wild variety of potato, Solanum microdontum, researchers found the genetic marker for higher calcium levels. Credit Photo credit John Bamberg. Usage Restrictions Please use with story only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.