Associations between enzyme genotypes and dark respiration in perennial ryegrass, Lolium perenne L.

D. Y. Rainey, J. B. Mitton, R. K. Monson

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

In this study, we determined whether relationships existed between dark respiration and genotype at five enzyme polymorphisms in perennial ryegrass, Lolium perenne L. Positive correlations were found between Q10 of dark respiration and genotype at the phosphoglucomutase (PGM) and 6-phosphogluconate dehydrogenase (6PGD) loci. Plants doubly homozygous for the common allele at these loci were found to have Q10 values 20% higher than those for double heterozygotes. In plants that were heat stressed for five consecutive days, Q10 was found to be negatively correlated with apparent vigor after stressing. Individuals homozygous for PGM and 6PGD (with higher Q10 values) exhibited more apparent damage following the stress than heterozygous individuals. Both PGM and 6PGD occupy positions in metabolism with regulatory potential. Although caution must be used in assigning causal relationships, the results suggest that specific forms of these enzymes are directly related to, or are correlated with, the determinants of respiratory efficiency in L. perenne.

Original languageEnglish (US)
Pages (from-to)335-338
Number of pages4
JournalOecologia
Volume74
Issue number3
DOIs
StatePublished - Dec 1 1987
Externally publishedYes

Keywords

  • Dark respiration
  • Enzyme polymorphisms
  • Heat stress
  • Heterozygosity
  • Lolium perenne

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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