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Adaptations that Reduce Water Loss

Adaptations that Reduce Water Loss

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.

Regulation of Transpiration by Stomata

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During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.

The Calvin Benson Cycle

The Calvin Benson Cycle

Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...

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C4 Pathway
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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.

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Author Spotlight: Unraveling Plant Responses to Abiotic Stresses Using the PlantScreen Robotic Platform

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Published on: June 7, 2024

Incorporating photosynthetic acclimation improves stomatal optimisation models.

Victor Flo^1,2, Jaideep Joshi^3,4,5,6, Manon Sabot^7,8,9

¹Department of Life Sciences, Georgina Mace Centre for the Living Planet, Imperial College London, Silwood Park Campus, Ascot, UK.

Plant, Cell & Environment

|April 8, 2024

Summary

This summary is machine-generated.

Accounting for photosynthetic acclimation improves plant drought response models. This crucial factor enhances predictions of carbon assimilation, vital for understanding plant resilience to climate change.

Keywords:

carbon assimilation photosynthetic cost soil drought stomatal conductance stomatal limitation

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Relating Stomatal Conductance to Leaf Functional Traits

Relating Stomatal Conductance to Leaf Functional Traits

Published on: October 12, 2015

Area of Science:

Plant physiology
Ecology
Climate change biology

Background:

Stomatal regulation balances carbon gain and water loss in plants.
Accurate stomatal models are vital for predicting plant responses to climate change.
Current models often neglect biochemical acclimation to drought.

Purpose of the Study:

To compare stomatal optimization models with and without photosynthetic acclimation.
To assess the impact of photosynthetic acclimation on drought response predictions.
To improve estimates of plant carbon assimilation under drought.

Main Methods:

Compared six instantaneous stomatal optimization models.
Evaluated models with and without photosynthetic acclimation.
Utilized experimental data from 37 diverse plant species.

Main Results:

Accounting for photosynthetic acclimation improved carbon assimilation predictions in most models.
Photosynthetic acclimation significantly reduced photosynthesis under drought across all models.
Hydraulic impairment alone did not fully explain drought effects on photosynthesis.

Conclusions:

Photosynthetic acclimation is essential for accurate drought impact modeling in plants.
Integrating acclimation improves understanding of plant carbon assimilation under stress.
Models must consider biochemical adjustments for robust climate change impact assessments.