Chromosomal and cell size analysis of cold tolerant maize

L. M. McMurphy, A. L. Rayburn

Research output: Contribution to journalArticlepeer-review

Abstract

C-band number, guard cell length, and chloroplast number per guard cell were determined for eight maize populations. These populations consisted of maize selected for cold tolerance at the University of Nebraska as well as the original unselected populations. The genome size of these populations had previously been determined. C-band number fluctuated concertedly with the changes in genome size indicating that deletions and additions of constitutive heterochromatin occurred during selection, resulting in altered genome sizes. Guard cell size of all the cold tolerant populations was greater than the cell size of the respective nonselected populations. Chloroplast number per guard cell was also higher in all the cold tolerant populations than in their parental populations, but the increases were not statistically significant. The results indicate that changes in genome size that occurred during selection for cold tolerance are the result of changes in amounts of C-band heterochromatin and that the selection process results in an increase in cell size in the cold tolerant populations.

Original languageEnglish (US)
Pages (from-to)798-802
Number of pages5
JournalTheoretical and Applied Genetics
Volume84
Issue number7-8
DOIs
StatePublished - Sep 1992

Keywords

  • C-banding
  • Cell size
  • Chloroplast number
  • Cold tolerance
  • Zea mays

ASJC Scopus subject areas

  • Biotechnology
  • Agronomy and Crop Science
  • Genetics

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