In a new study conducted by the same research group, the researchers used the Embolism Visualization technique and confirmed that there is a clear Hydraulic Vulnerability Segmentation (HVS) mechanism in tree species with compound-leaves. The HVS mechanism here refers to "a consistent pattern of stem > petiole > leaflet in terms of xylem resistance to embolism and hydraulic safety margins", according to the researchers.

During drought conditions, compound-leaved trees benefit from the early Embolism Vulnerability occurred in organs such as leaflets and petioles, as that provides a degree of protection to the more carbon costly stems and the integrity of the hydraulic system. While under moist conditions, the efficient hydraulic system of compound-leaved species supports high stomatal conductance and photosynthetic rate, thus high productivity.

"The study highlights the importance of HVS as an adaptive mechanism of compound-leaved trees to withstand drought stress," said the researchers.

The study entitled "Hydraulic vulnerability segmentation in compound-leaved trees: evidence from embolism visualization technique" has been published in Plant Physiology. The study was mainly supported by the National Natural Science Foundation of China.