Abstract
Tomato seedlings (Lycopersicon esculentum Mill.) chilled starting at different times during the light/dark cycle were most chilling-sensitive at the end of the dark period (AI King, MS Reid, BD Patterson 1982 Plant Physiol 70: 211-214). Low-temperature tolerance was regained with as little as 10 minutes of light exposure. Low light intensities were less effective than high light intensities in reducing sensitivity, and the length of exposure to light directly influenced sensitivity. Seedlings kept at low night temperatures prior to chilling were also less injured following chilling. Light also restored chilling tolerance to seedlings whose roots were removed. Supplying cut shoots with sucrose, glucose, or fructose reduced chilling sensitivity and largely eliminated the diurnal difference in sensitivity. Endogenous carbohydrate content was correlated with changes in chilling sensitivity; starch and sugar content fell markedly during the dark period. Increased concentrations of sugars were detected 15 minutes after the start of the light period. This evidence all suggests that changes in chilling sensitivity over the diurnal period are regulated by the light cycle. It also suggests that increased sensitivity at the end of the dark period could be due to carbohydrate depletion, and that chilling tolerance following light exposure is likely due to carbohydrate accumulation or closely related events.
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Claims 11
Claim · model-written summary
Ten minutes of light restored low temperature tolerance.
Not reportedTaxonComparator
Verbatim
e0“Low-temperature tolerance was regained with as little as 10 minutes of light exposure.”
Claim · model-written summary
Low light was less effective than high light at reducing chilling sensitivity.
- Treatment
- Low light intensitiese0
- Outcome
- sensitivitye0
- Direction
- less effectivee0
- Comparator
- high light intensitiese0
Not reportedTaxon
Verbatim
e0“Low light intensities were less effective than high light intensities in reducing sensitivity”
Claim · model-written summary
Length of light exposure influenced chilling sensitivity.
Not reportedTaxonDirection
Verbatim
e0“the length of exposure to light directly influenced sensitivity.”
Claim · model-written summary
Lower prior night temperatures reduced chilling injury.
Not reportedTaxonComparator
Verbatim
e0“Seedlings kept at low night temperatures prior to chilling were also less injured following chilling.”
Claim · model-written summary
Light restored chilling tolerance in rootless seedlings.
Not reportedTaxonComparator
Verbatim
e0“Light also restored chilling tolerance to seedlings whose roots were removed.”
Claim · model-written summary
Sucrose reduced chilling sensitivity and largely removed diurnal variation.
- Treatment
- sucrosee0
- Outcome
- chilling sensitivity and largely eliminated the diurnal difference in sensitivitye0
- Direction
- reducede0
Not reportedTaxonComparator
Verbatim
e0“Supplying cut shoots with sucrose, glucose, or fructose reduced chilling sensitivity and largely eliminated the diurnal difference in sensitivity.”
Claim · model-written summary
Glucose reduced chilling sensitivity and largely removed diurnal variation.
- Treatment
- glucosee0
- Outcome
- chilling sensitivity and largely eliminated the diurnal difference in sensitivitye0
- Direction
- reducede0
Not reportedTaxonComparator
Verbatim
e0“Supplying cut shoots with sucrose, glucose, or fructose reduced chilling sensitivity and largely eliminated the diurnal difference in sensitivity.”
Claim · model-written summary
Fructose reduced chilling sensitivity and largely removed diurnal variation.
- Treatment
- fructosee0
- Outcome
- chilling sensitivity and largely eliminated the diurnal difference in sensitivitye0
- Direction
- reducede0
Not reportedTaxonComparator
Verbatim
e0“Supplying cut shoots with sucrose, glucose, or fructose reduced chilling sensitivity and largely eliminated the diurnal difference in sensitivity.”
Claim · model-written summary
Carbohydrate content correlated with chilling sensitivity.
Not reportedTaxonDirection
Verbatim
e0“Endogenous carbohydrate content was correlated with changes in chilling sensitivity”
Claim · model-written summary
Starch and sugar content fell during darkness.
Not reportedTaxon
Verbatim
e0“starch and sugar content fell markedly during the dark period.”
Claim · model-written summary
Sugar concentrations increased within 15 minutes after light began.
- Outcome
- concentrations of sugarse0
- Direction
- Increasede0
- Qualifier
- 15 minutes after the start of the light periode0
Not reportedTaxon
Verbatim
e0“Increased concentrations of sugars were detected 15 minutes after the start of the light period.”