Stomata as a Defence Nexus: Integrating Drought and Pathogen Stress Signalling.
Liu Z, Kong L, Yan L, Zhao Q, Li M
Plant Signaling
PubMedWhen your tomatoes or roses face a dry spell followed by a fungal outbreak — a scenario becoming more common with shifting weather — their survival hinges on the same tiny leaf pores learning to fight two battles at once.
Leaves are covered in microscopic pores called stomata that open to breathe in carbon dioxide and close to save water. It turns out these same pores are also the plant's first line of defense against bacteria and fungi trying to sneak inside. Scientists are now mapping out how plants juggle both threats at the same time — sometimes the signals help each other, and sometimes they get in each other's way.
Key Findings
Stomata act as dual-function sensors, detecting both water shortage and pathogen presence through overlapping but distinct chemical signaling cascades.
Guard cells — the paired cells that open and close stomata — integrate stress signals via mitogen-activated protein kinase cascades and reactive oxygen species bursts, creating complex synergistic and antagonistic responses under combined drought and pathogen pressure.
The interaction between drought and pathogen stress signaling is not additive but dynamic, meaning a plant under drought may respond differently to a pathogen attack than a well-watered plant, with implications for disease susceptibility during dry conditions.
chevron_right Technical Summary
Plant stomata — the tiny pores on leaves — do double duty as both breathing holes and security guards, detecting drought and invading pathogens simultaneously. This review reveals how these microscopic structures coordinate surprisingly sophisticated chemical signals to mount defenses against two threats at once.
Abstract Preview
Plant stomata are microscopic leaf pores that regulate gas exchange but also serve as pathogen entry points and frontline sensors for stresses like drought. This review synthesises current understa...
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