Abstract
In pot experiments performed on maize seedlings chilled at 5 °C, leaf injury was diminished by the application of elevated temperature (1 or 5 h at 15 or 20°C, "warm breaks" treatment) in a dose-dependent manner. The lower the injury count, the higher the catalase (CAT) activity. In a separate experiment, the application of 100 % relative humidity also protected the plants from chilling injury and water loss, increased their gas exchange and variable to maximum chlorophyll fluorescence ratio (Fv/Fm), but did not influence CAT activity. Another protective environmental factor, elevated atmospheric CO2 concentration [700 µmol(CO2) mol-1(air)] diminished CAT activity inhibition, but only in plants of chilling-resistant cultivar. The positive impact of specific environmental factors accompanying chilling is not obviously related to the suppression of the inhibition of CAT activity, although the enzyme is considered as chilling-sensitive.
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Claims 7
Claim · model-written summary
Warm breaks reduced leaf injury in chilled maize seedlings in a dose-dependent manner.
- Treatment
- elevated temperature (1 or 5 h at 15 or 20°C, "warm breaks" treatment)e0
- Outcome
- leaf injurye0
- Direction
- diminishede0
- Qualifier
- chilled at 5 °Ce0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maize seedlings chilled at 5 °C, leaf injury was diminished by the application of elevated temperature (1 or 5 h at 15 or 20°C, "warm breaks" treatment) in a dose-dependent manner”
Claim · model-written summary
Lower injury counts coincided with higher CAT activity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lower the injury count, the higher the catalase (CAT) activity”
t0“maize leaves”
Claim · model-written summary
High relative humidity protected plants from chilling injury and water loss.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the application of 100 % relative humidity also protected the plants from chilling injury and water loss”
t0“maize leaves”
Claim · model-written summary
High relative humidity increased gas exchange and Fv/Fm.
- Treatment
- 100 % relative humiditye0
- Outcome
- gas exchange and variable to maximum chlorophyll fluorescence ratio (Fv/Fm)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the application of 100 % relative humidity also protected the plants from chilling injury and water loss, increased their gas exchange and variable to maximum chlorophyll fluorescence ratio (Fv/Fm)”
t0“maize leaves”
Claim · model-written summary
High relative humidity did not influence CAT activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the application of 100 % relative humidity also protected the plants from chilling injury and water loss, increased their gas exchange and variable to maximum chlorophyll fluorescence ratio (Fv/Fm), but did not influence CAT activity”
t0“maize leaves”
Claim · model-written summary
Elevated CO2 reduced CAT activity inhibition only in chilling-resistant plants.
- Treatment
- elevated atmospheric CO2 concentration [700 µmol(CO2) mol-1(air)]e0
- Outcome
- CAT activity inhibitione0
- Direction
- diminishede0
- Qualifier
- only in plants of chilling-resistant cultivare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated atmospheric CO2 concentration [700 µmol(CO2) mol-1(air)] diminished CAT activity inhibition, but only in plants of chilling-resistant cultivar”
t0“maize leaves”
Claim · model-written summary
Protection by the tested factors was not clearly tied to suppression of CAT inhibition.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The positive impact of specific environmental factors accompanying chilling is not obviously related to the suppression of the inhibition of CAT activity”
t0“maize leaves”
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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.