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Related Experiment Videos

Ethylene Inhibitors Partly Restore Nodulation to Pea Mutant E 107 (brz).

F C Guinel1, T A Larue

  • 1Boyce Thompson Institute for Plant Research, Ithaca, New York 14853-1801.

Plant Physiology
|June 1, 1992
PubMed
Summary

The pea mutant E107 shows poor nodulation, but ethylene inhibitors like AVG and Ag(+) partially restore this process. This suggests nodule development can be separated from other E107 traits like leaf necrosis.

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Area of Science:

  • Plant genetics
  • Molecular biology
  • Agronomy

Background:

  • The pea mutant E107 (brz) exhibits pleiotropic effects, including reduced nodulation, leaf necrosis, and ion accumulation.
  • Understanding the genetic basis of these traits is crucial for improving crop yield and nitrogen fixation.

Purpose of the Study:

  • To investigate the defective nodulation in the pea mutant E107.
  • To determine if nodule development in E107 can be separated from its other pleiotropic characteristics.

Main Methods:

  • Light microscopy was used to examine lateral roots and infection progression in E107 compared to the wild type Sparkle.
  • Pea plants were treated with ethylene inhibitors: aminoethoxyvinylglycine (AVG) and silver ions (Ag(+)).

Main Results:

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  • E107 exhibited significantly fewer root infections per centimeter compared to Sparkle, with most infections aborting before penetrating the epidermis.
  • Treatment with AVG or Ag(+) partially restored nodulation in E107.
  • Ag(+) treatment improved the completion rate of infections but did not increase the number of infections.
  • Ethylene inhibitor treatments did not affect plant size, shoot cation accumulation, or leaf necrosis in E107.

Conclusions:

  • Nodule development in the pea mutant E107 can be genetically uncoupled from other pleiotropic traits such as leaf necrosis and ion accumulation.
  • Ethylene signaling plays a role in regulating nodulation in E107, as indicated by the partial restoration of nodulation with ethylene inhibitors.