Root Tip (IMAGE) Carnegie Institution for Science Caption The balances between stem cell quiescence, cell division and cell elongation are crucial for the continuous growth of plant roots. These balances are maintained by two opposite gradients of antagonistic hormones, auxin and brassinosteroid. Credit Zhiyong Wang Usage Restrictions With credit 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.