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How does deep water rice solve its aeration problem.

I Raskin1, H Kende

  • 1MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824.

Plant Physiology
|June 1, 1983
PubMed
Summary
This summary is machine-generated.

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Air layers trapped on rice leaves are crucial for aeration, facilitating gas exchange vital for survival in flooded conditions. These external air layers are more important than internal leaf spaces for gas transport.

Area of Science:

  • Plant Physiology
  • Aquatic Botany

Background:

  • Partially flooded deep water rice relies on external air layers for aeration.
  • Internal leaf air spaces are less significant for gas conduction compared to external air layers.

Purpose of the Study:

  • To investigate the role and importance of air layers in the aeration and survival of partially submerged rice plants.
  • To compare air layer formation in rice with non-adapted cereals.

Main Methods:

  • Observation of air layer formation and gas movement (diffusion and mass flow) in rice leaves under varying light conditions.
  • Experimental removal of air layers using a surfactant (Triton X-100) to assess plant response.
  • Comparison of air layer size in rice with oats, barley, and wheat.

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Main Results:

  • External air layers constitute a major aeration pathway, with a volume of approximately 45% of the leaf blade.
  • Gas movement occurs via diffusion and mass flow, with air drawn down in darkness and O(2) expelled in light.
  • Surfactant treatment preventing air layer formation led to inhibited growth and deterioration of submerged plant parts.
  • Rice exhibits significantly larger air layers than non-adapted cereals.

Conclusions:

  • Air layers are vital for rice survival in partially flooded conditions, enhancing gas exchange and photosynthetic carbon fixation.
  • The presence of air layers provides a significant survival advantage, even for completely submerged rice plants.