Does MPK4/12-HT1 function as a CO2/bicarbonate sensor to regulate the stomatal conductance under high CO2 levels?

Review Plant Sciences

The decline of plant mineral nutrition under rising CO2: physiological and molecular aspects of a bad deal

Alain Gojon et al.

Summary: Elevated atmospheric CO2 concentration negatively affects C3 plant physiology beyond photosynthesis and carbon metabolism, leading to reduced mineral nutrient concentrations in plant tissues. This poses significant threats to crop quality, nutrient cycles, and carbon sinks in terrestrial agro-ecosystems. The detrimental effect on plant mineral status, particularly nitrogen, is associated with the direct inhibition of key mechanisms of nitrogen uptake and assimilation. Promising strategies for identifying genotypes that can maintain robust nutrient status in a high-CO2 world are also discussed.

TRENDS IN PLANT SCIENCE (2023)

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Article Multidisciplinary Sciences

Phytocytokine signalling reopens stomata in plant immunity and water loss

Zunyong Liu et al.

Summary: Stomatal reopening in plants is dynamically regulated by the interaction between secreted peptides SCREWs and the receptor kinase NUT. This system counter-regulates the closure of stomata induced by abscisic acid and microbe-associated molecular patterns. SCREWs trigger the phosphorylation of key proteins involved in stomatal closure, leading to increased activity of kinase OST1 and reduced activity of anion channels. The SCREW-NUT system plays an important role in preventing uncontrolled stomatal closure and optimizing plant fitness.

NATURE (2022)

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Article Multidisciplinary Sciences

Stomatal CO2/bicarbonate sensor consists of two interacting protein kinases, Raf-like HT1 and non-kinase-activity activity requiring MPK12/MPK4

Yohei Takahashi et al.

Summary: The rise in atmospheric CO2 concentration affects stomatal closing in plants, impacting transpirational water loss, photosynthesis, and growth. This study identifies MPK4/12 and HT1 as the primary CO2 sensors in plants, located upstream of the CBC1 kinase. These findings are significant for understanding the plant response to CO2.

SCIENCE ADVANCES (2022)

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Article Plant Sciences