SUMMARY
Previous papers by the authors determined a series of anatomo-ecological characters of leaves that suggest possible physiological behaviors of several clones of Hevea spp. and other genera of economic interest. The present paper correlates anatomical characters with physiological parameters in an attempt to determine dependence of the latter with the former. Several anatomical indexes of leaves of six clones of Hevea spp. were determined and correlated with physiological measurementes of the same, such as water potencial, stomatal resistence and photosynthetic efficiency. The results suggest a storng correlation between leaf structure and physiological behavior showing that anatomy can be used os an indicator of drought tolerance, photosynthetic efficiency, and thus, productivity. On the basis of these indices of correlation it is possible to place the anatomical, physiological, and physio-anatomical parameters relative to their magnitude of importance in order to diagnose the plants with resistance to hidration and to dayness. It is also possible to situate the parameters relative to productivity. All the indices were made on the basis of photosynthetic efficiency of leaves subjected to different grads of hydration. Also note that the corrected parameters were, invariably, more precise compared with the analyzed results without correction.