Researcher Holding Roots (IMAGE) American Society of Agronomy Caption Apple trees in commercial orchards are grafted plants. The above-ground portion of the desired apple tree is attached to a healthy root system. Here, researcher Greg Peck harvests apple roots. Credit Greg Peck Usage Restrictions For use with this 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.