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Growth function and intercellular water transfer in excised roots.

A V Anisimov1, N R Dautova1, Maksim A Suslov2

  • 1FRC Kazan Scientific Center, Russian Academy of Sciences, Kazan Institute of Biochemistry and Biophysics, Lobachevskogo 2/31 st, P.O. Box 30, Kazan, 420111, Russia.

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|May 29, 2019
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Summary

Excised maize root segments retain growth and water regulation functions. However, cutting reduces intercellular permeability due to cell defensive responses to water loss.

Keywords:
Effective intercellular permeabilityExcised root segmentsGrowthWater transfer

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Area of Science:

  • Plant physiology
  • Root biology
  • Water transport mechanisms

Background:

  • Maize seedling roots exhibit complex water transport.
  • Understanding root suction zone function is crucial for plant water uptake.
  • Investigating excised root segments can reveal intrinsic physiological responses.

Purpose of the Study:

  • To determine if excised maize root suction zone segments maintain growth and water transfer functions.
  • To quantify the effect of fragmentation on root intercellular permeability.
  • To elucidate the cellular mechanisms underlying permeability changes in excised root segments.

Main Methods:

  • Utilized maize seedlings for root segment analysis.
  • Employed gradient Nuclear Magnetic Resonance (NMR) to measure water transfer.
  • Excised root suction zone segments of varying lengths for comparative analysis.

Main Results:

  • Excised root suction zone segments maintained elongation growth and regulated water transfer.
  • Intercellular permeability of excised segments was reduced compared to intact roots.
  • Fragmentation into 3 mm segments decreased permeability by 60%.

Conclusions:

  • Maize root suction zone segments retain physiological functions post-excision.
  • Cutting induces a defensive response in root cells, reducing water permeability.
  • Fragmentation significantly impairs water transport capacity in root segments.