Abstract
Maize (Zea mays) seedlings were pretreated prior to heat shock with either a progressive water stress of -0.25 megapascal PEG/hour from 0 to -1.25 megapascal over a 6-hour time period, or various concentrations of copper, cadmium, or zinc for 4 days. When the subsequent heat shock of 40 or 45 degrees C was administered for 3 hours, the seedlings showed an induced thermotolerance to these temperatures, which were otherwise lethal to control (water grown) seedlings. Thermotolerance was exhibited by both the root and the shoot of pretreated seedlings, even though the water and heavy metal stresses were applied only to the roots. Neither of these pretreatments had induced the synthesis of detectable levels of heat shock proteins (Hsps) at the time of heat shock. Pretreatment of seedlings with a progressive heat shock of 2 degrees C/hour from 26 to 36 degrees C, which did induce Hsps 18, 70, and 84, resulted in tolerance of a severe water stress of -1.5, -1.75, or -2.0 megapascal for 24 hours. But these seedlings producing Hsps were no better protected against water stress than those pretreated with a progressive water stress which did not produce Hsps. Hsps appear not to act as general stress proteins and their presence is not always required for the establishment of thermotolerance.
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Claims 10
Claim · model-written summary
Progressive water stress pretreatment induced maize seedling tolerance to an otherwise lethal heat shock.
- Treatment
- a progressive water stress of -0.25 megapascal PEG/hour from 0 to -1.25 megapascal over a 6-hour time periode0
- Outcome
- thermotolerancee1
- Direction
- inducede1
- Qualifier
- heat shock of 40 or 45 degrees C was administered for 3 hourse2
- Comparator
- control (water grown) seedlingse1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays) seedlings were pretreated prior to heat shock with either a progressive water stress of -0.25 megapascal PEG/hour from 0 to -1.25 megapascal over a 6-hour time period”
e1“the seedlings showed an induced thermotolerance to these temperatures, which were otherwise lethal to control (water grown) seedlings”
e2“heat shock of 40 or 45 degrees C was administered for 3 hours”
Claim · model-written summary
Copper pretreatment induced thermotolerance to otherwise lethal heat shock in maize seedlings.
- Treatment
- coppere0
- Outcome
- thermotolerancee1
- Direction
- inducede1
- Comparator
- control (water grown) seedlingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“various concentrations of copper, cadmium, or zinc for 4 days”
e1“the seedlings showed an induced thermotolerance to these temperatures, which were otherwise lethal to control (water grown) seedlings”
t0“Maize”
Claim · model-written summary
Cadmium pretreatment induced thermotolerance to otherwise lethal heat shock in maize seedlings.
- Treatment
- cadmiume0
- Outcome
- thermotolerancee1
- Direction
- inducede1
- Comparator
- control (water grown) seedlingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“various concentrations of copper, cadmium, or zinc for 4 days”
e1“the seedlings showed an induced thermotolerance to these temperatures, which were otherwise lethal to control (water grown) seedlings”
t0“Maize”
Claim · model-written summary
Zinc pretreatment induced thermotolerance to otherwise lethal heat shock in maize seedlings.
- Treatment
- zince0
- Outcome
- thermotolerancee1
- Direction
- inducede1
- Comparator
- control (water grown) seedlingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“various concentrations of copper, cadmium, or zinc for 4 days”
e1“the seedlings showed an induced thermotolerance to these temperatures, which were otherwise lethal to control (water grown) seedlings”
t0“Maize”
Claim · model-written summary
Root-only water and heavy metal pretreatments conferred thermotolerance to both maize roots and shoots.
- Organ / stage
- both the root and the shoote0
- Treatment
- water and heavy metal stressese0
- Outcome
- Thermotolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thermotolerance was exhibited by both the root and the shoot of pretreated seedlings, even though the water and heavy metal stresses were applied only to the roots.”
t0“Maize”
Claim · model-written summary
Water and heavy metal pretreatments did not induce detectable heat shock protein synthesis at the heat shock time.
- Treatment
- water and heavy metal stressese1
- Outcome
- synthesis of detectable levels of heat shock proteins (Hsps)e0
- Direction
- Neithere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither of these pretreatments had induced the synthesis of detectable levels of heat shock proteins (Hsps) at the time of heat shock.”
e1“water and heavy metal stresses”
t0“Maize”
Claim · model-written summary
Progressive heat shock induced maize Hsps 18, 70, and 84.
- Treatment
- a progressive heat shock of 2 degrees C/hour from 26 to 36 degrees Ce0
- Outcome
- Hsps 18, 70, and 84e0
- Direction
- inducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pretreatment of seedlings with a progressive heat shock of 2 degrees C/hour from 26 to 36 degrees C, which did induce Hsps 18, 70, and 84”
t0“Maize”
Claim · model-written summary
Progressive heat shock pretreatment induced tolerance to severe water stress in maize seedlings.
- Treatment
- a progressive heat shock of 2 degrees C/hour from 26 to 36 degrees Ce0
- Outcome
- tolerance of a severe water stresse1
- Direction
- resulted ine1
- Qualifier
- -1.5, -1.75, or -2.0 megapascal for 24 hourse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pretreatment of seedlings with a progressive heat shock of 2 degrees C/hour from 26 to 36 degrees C”
e1“resulted in tolerance of a severe water stress of -1.5, -1.75, or -2.0 megapascal for 24 hours”
t0“Maize”
Claim · model-written summary
Maize seedlings producing Hsps had no better water-stress protection than seedlings given progressive water stress pretreatment without Hsps.
- Treatment
- seedlings producing Hspse0
- Outcome
- protected against water stresse0
- Direction
- no bettere0
- Comparator
- those pretreated with a progressive water stress which did not produce Hspse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these seedlings producing Hsps were no better protected against water stress than those pretreated with a progressive water stress which did not produce Hsps”
t0“Maize”
Claim · model-written summary
The authors conclude Hsps are not general stress proteins and are not always needed for thermotolerance in maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hsps appear not to act as general stress proteins and their presence is not always required for the establishment of thermotolerance.”
t0“Maize”
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zinc atom · tolerance: abiotic · Zea mays (maize)Results agree
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See all 12 papers →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.