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Theoretical and Applied Genetics

, Volume 78, Issue 1, pp 23–30 | Cite as

Alloplasmic male sterility in AD allotetraploid Gossypium hirsutum upon replacement of its resident A cytoplasm with that of D species G. harknessii

  • G. A. Galau
  • T. A. Wilkins
Originals

Summary

Alloplasmic male sterile (cms) and restoration-of-fertility (Rf) lines of the AD allotetraploid Gossypium hirsutum were earlier derived from the presumed introgression of the cytoplasm of the D species G. harknessii. To confirm that this happened and address its significance, cytoplasms of the maternal progenitor, backcross intermediates, derived breeding lines, related A, D, and F species, and a synthetic AD tetraploid were examined by agarose and polyacrylamide gel electrophoresis of 140 restriction enzyme fragments of chloroplast DNA. Length mutations of 10–50 nucleotides predominate over site loss/gain mutations. Chloroplast DNA is maternally inherited and that of G. harknessii has been maintained in the cms lines for at least 13 successive generations without detectable alteration. Chloroplast DNA divergence is consistent with current nuclear genome classification and shows that the A progenitor was the maternal parent of the AD tetraploids. As predicted from incompatability models of cms, the degree of male sterility in alloplasmic Gossypium tetraploids is correlated with the extent of evolutionary divergence of their cytoplasms. It is suggested that the A genome in the AD tetraploids dominates those nuclear-cytoplasm interactions reflected by male fertility.

Key words

Gossypium chloroplast DNA Maternal inheritance Cytoplasm classification Allotetraploid maternal ancestor Alloplasmic male sterility 

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • G. A. Galau
    • 1
  • T. A. Wilkins
    • 1
  1. 1.Department of BotanyUniversity of GeorgiaAthensUSA

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