Root Sections (IMAGE) Penn State Caption Differences in bean plant growth observed by researchers were striking. In the phosphorus stress treatment, the genotypes with greater reduction of their secondary root growth had increased root length, took up more phosphorus, and had larger shoots than genotypes with greater secondary root growth, which had thicker, less efficient roots. Credit Jonathan Lynch Lab/Penn State Usage Restrictions Non commercial use 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.