Klaus Winter (IMAGE) Smithsonian Tropical Research Institute Caption An experiment on 70 different species from 40 plant families growing in Panama suggests that the adaptation to a drought-resistant photosynthesis mechanism seems to involve a fundamental reprogramming of organic-acid metabolism. Credit Sean Mattson/Smithsonian Tropical Research Institute Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC 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.