Flowering plants may owe their success to smarter leaf pores
Pichaco J, Rodriguez-Dominguez CM, Diaz-Espejo A
Plant Signaling
The rapid pore adjustments this mechanism enables are why a well-watered tomato plant can keep growing through a hot afternoon while a stressed one wilts and stalls, so understanding it could help breed crops that hold up better in drought.
Every leaf is covered in tiny pores called stomata that open to let in carbon dioxide for photosynthesis and close to stop water loss. This paper argues that flowering plants got especially good at controlling those pores using a stress hormone that lets them react in minutes to changing light, humidity, and CO2, rather than just passively responding to how much water is in the leaf. That quick, smart control may be a big reason flowering plants outcompeted other plant groups and now dominate most ecosystems on Earth.
Key Findings
Hydroactive stomatal control relies on abscisic acid signaling to actively drive guard-cell turgor changes, distinct from passive hydraulic responses to leaf water status
This mechanism allows minute-scale stomatal adjustments that integrate multiple signals (light, CO2, evaporative demand) simultaneously
The authors propose this trait, layered onto existing light- and CO2-responsive pathways, was a key factor enabling angiosperms' ecological dominance and diversification
chevron_right Technical Summary
Scientists propose that flowering plants took over the planet partly because their leaf pores evolved a fast, hormone-driven control system that lets them balance photosynthesis and water loss in real time as conditions change.
Abstract Preview
Original paper
Hydroactive stomata: a key innovation underpinning angiosperm ecological dominance.
Angiosperms rose to ecological dominance through innovations that enhanced photosynthetic capacity and water-use efficiency. We propose that a pivotal, yet underappreciated, contributor was the hyd...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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