Abstract
Abstract The simultaneous occurrence of low oxygen and high salinity conditions is common in a wide range of irrigated soils. The combined effects of O 2 and osmotic potential stresses on germination of wheat ( Triticum aestivum L. ‘Inia 66’) were tested under growth chamber conditions. A range of O 2 concentrations and salinity levels were chosen to simulate soil aeration and salinity combinations that might be expected to occur in well‐aerated, fine‐textured, saline, and saline‐sodic soils. Daily observations of number of seeds germinated and days to first germination were recorded. Analysis of variance of percent germination was performed in three different ways: i) using the original data, ii) using the arcsine transformation, and iii) deleting most of the 0% germination values to get better estimates of the error terms. Inia 66 showed tolerance to high salinity and low O 2 during germination. Close to full germination occurred at a salinity level of −6 bars (21% O 2 ) and at 2% O 2 (no salinity stress). However, the combination of high salinity with low O 2 depressed germination below economic levels. Predicted osmotic potentials associated with a 50% decrease in germination ranged from −10.8 bars at 21% O 2 to −3 bars at 1% O 2 . High salinity levels were more limiting than low O 2 concentrations. Days to first germination were increased only at O 2 concentrations lower than 5%. Apparently this concentration is the threshold at which germination is delayed at all the osmotic potentials tested. A function is proposed for predicting days to first germination under saline but good soil aeration conditions.
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Claims 8
Claim · model-written summary
Inia 66 tolerated high salinity and low oxygen during germination.
- Taxon
- wheat
Triticum aestivume1 - Material
- Inia 66e0
- Outcome
- tolerance to high salinity and low O 2 during germinatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inia 66 showed tolerance to high salinity and low O 2 during germination.”
e1“wheat”
Claim · model-written summary
Nearly full germination occurred at −6 bars and 21% oxygen.
- Taxon
- wheatTriticum aestivume1
- Treatment
- salinity level of −6 barse0
- Outcome
- Close to full germinatione0
- Qualifier
- 21% O 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Close to full germination occurred at a salinity level of −6 bars (21% O 2 )”
e1“wheat”
Claim · model-written summary
Nearly full germination occurred at 2% oxygen without salinity stress.
- Taxon
- wheatTriticum aestivume1
- Treatment
- 2% O 2e0
- Qualifier
- no salinity stresse0
Not reportedOutcome
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at 2% O 2 (no salinity stress).”
e1“wheat”
Claim · model-written summary
Combined high salinity and low oxygen depressed germination below economic levels.
- Taxon
- wheatTriticum aestivume1
- Treatment
- combination of high salinity with low O 2e0
- Outcome
- germinatione0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the combination of high salinity with low O 2 depressed germination below economic levels.”
e1“wheat”
Claim · model-written summary
Predicted osmotic potential for a 50% germination decrease ranged from −10.8 bars at 21% oxygen to −3 bars at 1% oxygen.
- Taxon
- wheatTriticum aestivume1
- Outcome
- osmotic potentials associated with a 50% decrease in germinatione0
- Direction
- decreasee0
- Value
- −10.8 bars at 21% O 2 to −3 bars at 1% O 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Predicted osmotic potentials associated with a 50% decrease in germination ranged from −10.8 bars at 21% O 2 to −3 bars at 1% O 2 .”
e1“wheat”
Claim · model-written summary
High salinity was more limiting than low oxygen.
- Taxon
- wheatTriticum aestivume1
- Outcome
- more limitinge0
- Direction
- more limitinge0
- Comparator
- low O 2 concentrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High salinity levels were more limiting than low O 2 concentrations.”
e1“wheat”
Claim · model-written summary
Days to first germination increased only below 5% oxygen.
- Taxon
- wheatTriticum aestivume1
- Treatment
- O 2 concentrations lower than 5%e0
- Outcome
- Days to first germinatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Days to first germination were increased only at O 2 concentrations lower than 5%.”
e1“wheat”
Claim · model-written summary
A predictive function for days to first germination under saline, well aerated conditions was proposed.
- Taxon
- wheatTriticum aestivume1
- Outcome
- predicting days to first germinatione0
- Qualifier
- saline but good soil aeration conditionse0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A function is proposed for predicting days to first germination under saline but good soil aeration conditions.”
e1“wheat”
The same questions in other papers
salinity · growth · Triticum aestivum (wheat)Positive and negative results
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