Stem sodium sequestration and photosynthetic maintenance correlated to distinct intraspecific salt tolerance in Chinese cork oak (Quercus variabilis).
Wang H, Chen X, Cao Y, Ma G, Zhang R
Climate Adaptation
If you're planting oaks for urban restoration or windbreaks in areas with road salt or alkaline soils, the provenance tag on your seedling — where it was grown and collected — could determine whether it thrives or fails within a season.
Scientists grew eight 'families' of Chinese cork oak — each originally collected from a different region of China — in salty water to see which ones survived best. The toughest trees had a clever trick: they moved the harmful salt out of their roots and leaves and stored it in their stems, keeping the rest of the plant working normally. Trees from Beijing and Yunnan were the champions, while those from Henan, Jiangsu, and Shandong struggled most.
Key Findings
Salt-tolerant provenances (Beijing and Yunnan) actively relocated sodium from roots into stems during early stress, preserving root water uptake and leaf photosynthesis.
Key indicators of salt tolerance were survival rate, maximum photochemical efficiency (Fv/Fm), and root and leaf potassium-to-sodium ratios across 16 measured traits.
Eight geographic provenances split into three tolerance groups: 2 salt-tolerant, 3 moderately tolerant, and 3 salt-sensitive — showing significant intraspecific variation within a single species.
chevron_right Technical Summary
Researchers tested eight regional populations of Chinese cork oak under salt stress and found that the most salt-tolerant trees survive by shuttling excess sodium into their stems, protecting roots and leaves from damage. This intraspecific variation reveals that where a tree comes from within a species matters enormously for its resilience.
Abstract Preview
Global environmental deterioration is exacerbating abiotic stresses, with soil salinization emerging as a significant threat to forest ecosystems. Although the Chinese cork oak (Quercus variabilis)...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Urban Tree Canopy Reduces Heat-Related Mortality by 39% in European Cities
Trees in your local park or street aren't just pretty — they are literally keeping people alive during heatwaves, and planting even a modest number of the ri...
Quercus variabilis, the Chinese cork oak, is a species of oak in the section Quercus sect. Cerris, native to a wide area of eastern Asia in southern, central, and eastern China, Taiwan, Japan, and Korea.