Abstract
Clonal ramets of 12 contrasting genotypes of Lolium perenne L. were grown in sand or soil-based compost and maintained under well-watered conditions at 20/15°C or acclimated to low temperature (2°C) or to a restricted water supply. Freezing tolerance was measured as LT50 following exposure to sub-zero temperatures in a freezing tank. Measurements were also made of osmotic potential, water-soluble carbohydrates, free proline, free amino acids, and minerals in entire tillers. Acclimation to both drought and cold lowered LT50, induced osmotic adjustment, and increased concentrations of proline and amino acids, Rooting medium had little effect on LT50, but caused large differences in osmotic potential and in proline and amino-acid concentrations. There was considerable genetic diversity for all characters measured, except for mineral contents. There was, however, no relationship between LT50 and osmotic potential or solute content that was consistent across the three sources of variation (growing medium, acclimation, genotype). Furthermore, the diverse genotypic values of cold-induced freezing tolerance were not correlated with those of drought-induced tolerance. It is concluded that more precise measurements are needed of the partitioning of solutes during acclimation and of the sensitivity of different organs and tissues to freezing.Copyright 1993, 1999 Academic Press
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Claims 12
Claim · model-written summary
Drought acclimation lowered LT50.
- Taxon
- Lolium perenne L.
Lolium perennet0 - Treatment
- droughte0
- Outcome
- LT50e0
- Direction
- lowerede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acclimation to both drought and cold lowered LT50, induced osmotic adjustment, and increased concentrations of proline and amino acids”
t0“Lolium perenne L.”
Claim · model-written summary
Cold acclimation lowered LT50.
- Taxon
- Lolium perenne L.Lolium perennet0
- Treatment
- colde0
- Outcome
- LT50e0
- Direction
- lowerede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acclimation to both drought and cold lowered LT50, induced osmotic adjustment, and increased concentrations of proline and amino acids”
t0“Lolium perenne L.”
Claim · model-written summary
Drought acclimation induced osmotic adjustment.
- Taxon
- Lolium perenne L.Lolium perennet0
- Treatment
- droughte0
- Outcome
- osmotic adjustmente0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acclimation to both drought and cold lowered LT50, induced osmotic adjustment, and increased concentrations of proline and amino acids”
t0“Lolium perenne L.”
Claim · model-written summary
Cold acclimation induced osmotic adjustment.
- Taxon
- Lolium perenne L.Lolium perennet0
- Treatment
- colde0
- Outcome
- osmotic adjustmente0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acclimation to both drought and cold lowered LT50, induced osmotic adjustment, and increased concentrations of proline and amino acids”
t0“Lolium perenne L.”
Claim · model-written summary
Drought acclimation increased proline and amino acid concentrations.
- Taxon
- Lolium perenne L.Lolium perennet0
- Treatment
- droughte0
- Outcome
- concentrations of proline and amino acidse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acclimation to both drought and cold lowered LT50, induced osmotic adjustment, and increased concentrations of proline and amino acids”
t0“Lolium perenne L.”
Claim · model-written summary
Cold acclimation increased proline and amino acid concentrations.
- Taxon
- Lolium perenne L.Lolium perennet0
- Treatment
- colde0
- Outcome
- concentrations of proline and amino acidse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acclimation to both drought and cold lowered LT50, induced osmotic adjustment, and increased concentrations of proline and amino acids”
t0“Lolium perenne L.”
Claim · model-written summary
Rooting medium had little effect on LT50.
- Taxon
- Lolium perenne L.Lolium perennet0
- Treatment
- Rooting mediume0
- Outcome
- LT50e0
- Qualifier
- little effecte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rooting medium had little effect on LT50, but caused large differences in osmotic potential and in proline and amino-acid concentrations.”
t0“Lolium perenne L.”
Claim · model-written summary
Rooting medium caused large differences in osmotic potential and proline and amino-acid concentrations.
- Taxon
- Lolium perenne L.Lolium perennet0
- Treatment
- Rooting mediume0
- Outcome
- osmotic potential and in proline and amino-acid concentrationse0
- Qualifier
- large differencese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rooting medium had little effect on LT50, but caused large differences in osmotic potential and in proline and amino-acid concentrations.”
t0“Lolium perenne L.”
Claim · model-written summary
Considerable genetic diversity occurred for measured characters except mineral contents.
- Taxon
- Lolium perenne L.Lolium perennet0
- Outcome
- genetic diversitye0
- Qualifier
- for all characters measured, except for mineral contentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was considerable genetic diversity for all characters measured, except for mineral contents.”
t0“Lolium perenne L.”
Claim · model-written summary
LT50 had no consistent relationship with osmotic potential or solute content across growing medium, acclimation and genotype.
- Taxon
- Lolium perenne L.Lolium perennet0
- Treatment
- acclimatione0
- Outcome
- LT50e0
- Qualifier
- no relationship between LT50 and osmotic potential or solute content that was consistent across the three sources of variation (growing medium, acclimation, genotype)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was, however, no relationship between LT50 and osmotic potential or solute content that was consistent across the three sources of variation (growing medium, acclimation, genotype).”
t0“Lolium perenne L.”
Claim · model-written summary
Genotypic values of cold-induced freezing tolerance were not correlated with drought-induced tolerance.
- Taxon
- Lolium perenne L.Lolium perennet0
- Outcome
- cold-induced freezing tolerancee0
- Qualifier
- not correlatede0
- Comparator
- drought-induced tolerancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the diverse genotypic values of cold-induced freezing tolerance were not correlated with those of drought-induced tolerance.”
t0“Lolium perenne L.”
Claim · model-written summary
The authors recommend more precise measurements of solute partitioning during acclimation and freezing sensitivity of organs and tissues.
- Taxon
- Lolium perenne L.Lolium perennet0
- Outcome
- more precise measurementse0
- Qualifier
- of the partitioning of solutes during acclimation and of the sensitivity of different organs and tissues to freezinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“more precise measurements are needed of the partitioning of solutes during acclimation and of the sensitivity of different organs and tissues to freezing”
t0“Lolium perenne L.”
The same questions in other papers
drought · pest · Lolium perenne (perennial ryegrass)Positive and negative results
1 in the opposite direction
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.