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Cytoplasmic Sterility Factors in VICIA FABA L.

J R Edwardson1, D A Bond, R G Christie

  • 1University of Florida, IFAS, Agronomy Department, Plant Virus Laboratory, Gainesville, Florida 32611.

Genetics
|March 1, 1976
PubMed
Summary

Cytoplasmic spherical bodies (CSB) were found in sterile Vicia faba plants but absent in fertile or restored lines. These CSB may be linked to the cause of male sterility in faba beans.

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Area of Science:

  • Plant Science
  • Cytogenetics
  • Molecular Biology

Background:

  • Cytoplasmic male sterility (CMS) is a crucial trait for hybrid seed production in many crops.
  • Understanding the genetic and ultrastructural basis of CMS is vital for crop improvement.
  • Vicia faba (faba bean) exhibits complex CMS phenomena, including reversion to fertility.

Purpose of the Study:

  • To investigate the ultrastructural characteristics of cytoplasmic male sterile (CMS) and reverted fertile tissues in Vicia faba.
  • To identify potential cellular components associated with the sterility phenotype.
  • To explore the relationship between cytoplasmic spherical bodies (CSB) and fertility restoration.

Main Methods:

  • Ultrathin sectioning of Vicia faba tissues from various lines: sterile, maintainer, restorer, and restored.
  • Transmission electron microscopy (TEM) for ultrastructural examination.
  • Comparative analysis of tissues from fertile, sterile, and reverted fertile plants.

Main Results:

  • Cytoplasmic spherical bodies (CSB), approximately 70 nm in diameter, were consistently observed in sterile Vicia faba plant tissues.
  • CSB were notably absent in tissues of maintainer, restorer, and restored sterile plants.
  • CSB were generally absent in reverted fertile tissues, with one exception where they were found in ovules of a reverted fertile plant.

Conclusions:

  • The presence of CSB is strongly correlated with the cytoplasmic male sterile phenotype in Vicia faba.
  • CSB are proposed to be either the location or the product of the sterility factors responsible for CMS.
  • Further research is needed to elucidate the precise role of CSB in the molecular mechanisms of Vicia faba CMS and fertility reversion.

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