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

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 Q10of dark respiration and genotype at the phosphoglucomutase (PGM) and 6-phosphogluconate d...

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Bibliographic Details
Published in:Oecologia 1987-01, Vol.74 (3), p.335-338
Main Authors: Rainey, D.Y, Mitton, J.B, Monson, R.K
Format: Article
Language:English
Subjects:
Alleles
Biological and medical sciences
Classical genetics, quantitative genetics, hybrids
Enzyme polymorphism
Enzymes
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
genotype
Genotypes
heat stress
Heat stress disorders
heterozygosity
High temperature
Leaves
Lolium perenne
Metabolism
Nitrogen metabolism
Phosphates
Plant physiology and development
Plants
Pteridophyta, spermatophyta
Respiration
Vegetals
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Summary: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 Q10of 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 Q10values 20% higher than those for double heterozygotes. In plants that were heat stressed for five consecutive days, Q10was found to be negatively correlated with apparent vigor after stressing. Individuals homozygous for PGM and 6PGD (with higher Q10values) 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.
ISSN:0029-8549
1432-1939
DOI:10.1007/BF00378926