Divergent floral hydraulic strategies in Bauhinia s.l.: lianas adopt drought tolerance while trees prioritize drought avoidance.
Ke Y, Zhang YB, Du YY, Huang XY, Liu FJ, Qi SH, Fang XW, Zhang YJ, Roddy AB, Zhang JL.
Climate Adaptation
Lianas are quietly winning the climate lottery in tropical forests — and understanding how their flowers stay alive through brutal dry seasons tells us which plants will dominate the jungles your grandchildren inherit.
Scientists compared the flowers of 32 tropical vine and tree species to figure out how each type survives flowering during the dry season. Vines (lianas) build tough, dense flowers that resist drying out, while trees load their flowers with stored water to weather the heat. Because dry seasons are getting longer and harsher, the vine strategy seems to be winning, which could reshape entire tropical forests.
Key Findings
Liana flowers had greater petal vein density, stomatal density, and drought tolerance than tree flowers across 24 measured traits in 16 liana and 16 tree species.
Tree flowers compensated with higher saturated water content and hydraulic capacitance — essentially acting as internal water tanks — while lianas traded hydraulic efficiency for safety.
This is the first study to show organ-level (flower-specific) hydraulic strategy differences between lianas and trees, providing a mechanism for liana dominance in seasonally dry tropical forests.
chevron_right Technical Summary
Lianas and trees in tropical forests have evolved opposite strategies for keeping their flowers hydrated during drought: lianas build structurally tough, water-efficient flowers, while trees stockpile internal water reserves. This divergence may help explain why lianas are thriving and expanding as dry seasons intensify under climate change.
Abstract Preview
Lianas are particularly abundant in seasonally dry tropical forests, where most species flower during the dry season. While hydraulic differences of vegetative organs between lianas and trees are w...
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Bauhinia is a large genus of flowering plants in the subfamily Cercidoideae and tribe Bauhinieae, in the large flowering plant family Fabaceae, with a pantropical distribution. The genus was named after the Bauhin brothers Gaspard and Johann, Swiss-French botanists.