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Related Concept Videos

Adaptations that Reduce Water Loss01:57

Adaptations that Reduce Water Loss

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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.
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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
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The design of residential plumbing systems requires carefully evaluating water demand, flow rates, and pressure dynamics to ensure both efficiency and reliability. The nature of water flow within pipes is defined by its Reynolds number, which classifies flow as either laminar (smooth) or turbulent.
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Design Example: Design of an Irrigation Channel01:27

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Trapezoidal channels are widely used in irrigation systems due to their cost-effectiveness and efficiency in conveying water. Trapezoidal channels feature a flat bottom and sloping sides, making them stable and easier to construct compared to other shapes. The bottom width and side slope ratio are determined based on the required flow capacity and site conditions. The side slope is kept gentle for unlined channels to prevent soil erosion.Hydraulic parameters in channel design include the flow...
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Related Experiment Video

Updated: Jun 20, 2025

Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method EFM
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A module involving HIGH LEAF TEMPERATURE1 controls instantaneous water use efficiency.

Chuanlei Xiao1, Huimin Guo1, Ruiying Li1

  • 1National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, Huazhong Agricultural University, Wuhan 430070, China.

Plant Physiology
|July 23, 2024
PubMed
Summary
This summary is machine-generated.

Researchers identified HIGH LEAF TEMPERATURE1 (HT1) as a key regulator of plant water use efficiency (iWUE). HT1

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Last Updated: Jun 20, 2025

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Area of Science:

  • Plant Physiology
  • Molecular Biology
  • Genetics

Background:

  • Drought stress severely impacts plant growth and agricultural yields.
  • Improving instantaneous water use efficiency (iWUE), regulated by stomata, is crucial for drought tolerance.
  • The precise mechanisms governing iWUE regulation remain largely unknown.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying MITOGEN-ACTIVATED PROTEIN KINASE12 (MPK12)-mediated regulation of iWUE in Arabidopsis thaliana.
  • To identify novel genes involved in stomatal regulation and CO2 signaling pathways controlling iWUE.

Main Methods:

  • Genetic screening of Arabidopsis mutants to identify suppressors of mpk12-4.
  • Genetic interaction studies and physiological analyses of identified mutants.
  • Photosynthetic-CO2 response curves and biomass measurements under varying water conditions.
  • Functional analysis of orthologs in Brassica napus and Oryza sativa.

Main Results:

  • HIGH LEAF TEMPERATURE1 (HT1) was identified as a novel regulator of iWUE, acting downstream of MPK12.
  • HT1, OPEN STOMATA1 (OST1), and GUARD CELL HYDROGEN PEROXIDE-RESISTANT1 (GHR1) function in a pathway activating SLOW ANION CHANNEL-ASSOCIATED1 (SLAC1) for iWUE control.
  • HT1 dysfunction enhanced iWUE and plant growth capacity.
  • Orthologs of HT1 in Brassica napus and Oryza sativa demonstrated conserved functions in iWUE and CO2 signaling.

Conclusions:

  • MPK12 regulates iWUE through a multi-module pathway involving HT1, OST1, GHR1, and SLAC1 in response to CO2 signaling.
  • HT1 is a critical component linking CO2 signaling in guard cells to iWUE.
  • HT1 represents a potential molecular target for enhancing crop iWUE and drought tolerance.