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Related Concept Videos

Tonicity in Plants00:53

Tonicity in Plants

Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity delimits the magnitude and direction of osmosis and results in three possible scenarios that alter the volume of a cell: hypertonicity, hypotonicity, and isotonicity. Due to differences in structure and physiology, tonicity of plant cells is different from that of animal cells in some scenarios.Plants and Hypotonic EnvironmentsUnlike animal cells,...

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THE EFFECT OF AUXINS ON PROTOPLASMIC STREAMING. III.

B M Sweeney1, K V Thimann

  • 1Biological Laboratories, Harvard University, Cambridge.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Malate enhances auxin-induced protoplasmic streaming in Avena coleoptile cells, particularly at low auxin concentrations. This finding supports malate

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Area of Science:

  • Plant Physiology
  • Cell Biology

Background:

  • Protoplasmic streaming is crucial for cellular transport.
  • Auxin (indole-3-acetic acid) influences plant growth and cellular processes.
  • Malate and iodoacetate are known to affect plant growth and respiration.

Purpose of the Study:

  • To develop a method for continuously recording protoplasmic streaming rates.
  • To investigate the effects of malate and iodoacetate on protoplasmic streaming velocity.
  • To correlate these effects with known impacts on growth and respiration.

Main Methods:

  • Continuous recording of protoplasmic streaming in Avena coleoptile epidermal cells.
  • Application of varying concentrations of indole-3-acetic acid, malate, and iodoacetate.
  • Analysis of streaming velocity under different treatment conditions.

Main Results:

  • Malate significantly enhanced auxin-induced streaming acceleration, especially at low auxin levels, lowering the sensitivity threshold.
  • In aged or pre-treated coleoptile sections, malate restored auxin's ability to accelerate streaming.
  • Iodoacetate (5 x 10(-5)M) completely inhibited auxin-induced streaming acceleration, while lower concentrations slightly increased streaming.

Conclusions:

  • Malate is essential for the auxin-mediated acceleration of protoplasmic streaming.
  • This reinforces a parallel between auxin's effects on streaming, growth, and respiration, likely involving the 4-carbon acid system.
  • The findings highlight the regulatory role of malate in auxin signaling pathways.