Meiotic pairing as an indicator of genome composition in polyploid prairie cordgrass (Spartina pectinata Link)

Jeffrey W. Bishop, Sumin Kim, María B. Villamil, D. K. Lee, A. Lane Rayburn

Research output: Contribution to journalArticlepeer-review

Abstract

The existence of neopolyploidy in prairie cordgrass (Spartina pectinata Link) has been documented. The neohexaploid was discovered coexisting with tetraploids in central Illinois, and has been reported to exhibit competitiveness in the natural environment. It is hypothesized that the natural tetraploid cytotype produced the hexaploid cytotype via production of unreduced gametes. Meiosis I chromosome pairing was observed in tetraploid (2n = 4x = 40), hexaploid (2n = 6x = 60), and octoploid (2n = 8x = 80) accessions and the percentage of meiotic abnormality was determined. Significant differences in meiotic abnormality exist between tetraploid, hexaploid, and octoploid cytotypes. An elevated incidence of abnormal, predominantly trivalent pairing in the neohexaploid suggests that it may possess homologous chromosomes in sets of three, in contrast to the tetraploid and octoploid cytotypes, which likely possess homologous chromosomes in sets of two. Abnormal chromosome pairing in the hexaploid may result in unequal allocation of chromosomes to daughter cells during later stages of meiosis. Chromosome pairing patterns in tetraploid, hexaploid, and octoploid cytotypes indicate genome compositions of AABB, AAABBB, and AABBA′A′B′B′, respectively.

Original languageEnglish (US)
Pages (from-to)235-240
Number of pages6
JournalGenetica
Volume145
Issue number2
DOIs
StatePublished - Apr 1 2017

Keywords

  • Chromosomes
  • Homology
  • Meiosis
  • Polyploidy

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Genetics
  • Plant Science
  • Insect Science

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