Variation in the ribosomal DNA intergenic spacer of a maize population mass-selected for high grain yield

T. R. Rocheford, J. C. Osterman, C. O. Gardner

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Variation in the intergenic spacer of ribosomal DNA (rDNA) was detected among individual plants of the open-pollinated maize variety 'Hays Golden' and populations derived from this variety. rDNA intergenic spacer-length variants were detected at approximately 200 bp intervals, consistent with the number of 200 bp subrepeats as the basis for this variation. Inheritance data revealed that more than one spacer-length class may be present on an individual chromosome. Fourteen different predominant rDNA intergenic spacer hybridization fragment patterns were detected. C-29, a population developed by 29 cycles of mass-selecting Hay Golden for high grain yield, exhibited a significant change in rDNA intergenic spacer hybridization fragment pattern composition in comparison to Hays Golden. This change included a reduction in frequency of the shortest predominant space-length variant (3.4 kb) and an increase in a 5.2 -kb hybridization fragment. I-31, a population developed through thermal neutron irradiation of Hays Golden and 31 generations of mass selection for high grain yield, did not exhibit a significant change in overall rDNA intergenic spacer composition. I-31 did exhibit an increase in frequency of the 5.2-kb hybridization fragment and a significant change in two specific hybridization fragment patterns that had also changed in C-29. These data, particularly for the C-29 population, suggest that rDNA intergenic spacer-length variants and/or associated loci were influenced by selection.

Original languageEnglish (US)
Pages (from-to)793-800
Number of pages8
JournalTheoretical and Applied Genetics
Volume79
Issue number6
DOIs
StatePublished - Jun 1 1990

Fingerprint

Ribosomal Spacer DNA
intergenic DNA
ribosomal DNA
Zea mays
grain yield
corn
hybridization
Population
Intergenic DNA
Neutrons
Hot Temperature
Chromosomes
hay
inheritance (genetics)
irradiation
chromosomes
heat
loci

Keywords

  • Intergenic spacer
  • Maize population
  • Ribosomal DNA
  • Ribosomal RNA genes

ASJC Scopus subject areas

  • Biotechnology
  • Agronomy and Crop Science
  • Genetics

Cite this

Variation in the ribosomal DNA intergenic spacer of a maize population mass-selected for high grain yield. / Rocheford, T. R.; Osterman, J. C.; Gardner, C. O.

In: Theoretical and Applied Genetics, Vol. 79, No. 6, 01.06.1990, p. 793-800.

Research output: Contribution to journalArticle

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