Abstract
Over 100 wheat varieties and breeding lines from India and Australia were screened in alkaline and waterlogged soils in 10 environments over two years at one drained location and two naturally waterlogged locations in India. Mean trial grain yield was reduced up to 70% in the environments where genotypes were waterlogged for up to 15 days at the vegetative stage in alkaline soil relative to plants in drained soils. Agronomic traits (plant height, tiller number, 1000-grain weight) of genotypes were also reduced under waterlogging. At one waterlogged site, up to 68% of the genetic diversity for predicted grain yields under waterlogging could be accounted for by number of tillers (r2 = 0.41–0.68 in 2011 and 2010, respectively) and positive correlations also occurred at the second site (r2 = 0.19–0.35). However, there was no correlation between grain yields across varieties under waterlogging in any trials at the two waterlogged locations. This may have occurred because waterlogged sites differed up to 4-fold in soil salinity. When salinity was accounted for, there was a good correlation across all environments (r2 = 0.73). A physiological basis for the relationship between tillering and waterlogging tolerance is proposed, associated with crown root development. Results are compared with findings in Australia in acidic soils, and they highlight major opportunities for wheat improvement by selection for numbers of tillers when crops are waterlogged during vegetative growth.
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Claims 9
Claim · model-written summary
Waterlogging in alkaline soil reduced mean grain yield by up to 70% relative to drainage.
- Taxon
- wheat
Triticum aestivumt0 - Organ / stage
- vegetative stagee0
- Treatment
- waterlogged for up to 15 dayse0
- Outcome
- grain yielde0
- Direction
- reducede0
- Value
- up to 70%e0
- Comparator
- plants in drained soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mean trial grain yield was reduced up to 70% in the environments where genotypes were waterlogged for up to 15 days at the vegetative stage in alkaline soil relative to plants in drained soils”
t0“wheat”
Claim · model-written summary
Waterlogging reduced plant height, tiller number and 1000-grain weight.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- waterlogginge0
- Outcome
- plant height, tiller number, 1000-grain weighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Agronomic traits (plant height, tiller number, 1000-grain weight) of genotypes were also reduced under waterlogging”
t0“wheat”
Claim · model-written summary
At one waterlogged site, tiller number accounted for up to 68% of genetic diversity in predicted yield.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- number of tillerse0
- Outcome
- genetic diversity for predicted grain yieldse0
- Value
- up to 68%e0
- Setting
- one waterlogged sitee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At one waterlogged site, up to 68% of the genetic diversity for predicted grain yields under waterlogging could be accounted for by number of tillers (r2 = 0.41–0.68 in 2011 and 2010, respectively)”
t0“wheat”
Claim · model-written summary
Tiller number correlated positively with predicted yield at the second waterlogged site.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- positive correlationse0
- Value
- r2 = 0.19–0.35e0
- Setting
- second sitee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“positive correlations also occurred at the second site (r2 = 0.19–0.35)”
t0“wheat”
Claim · model-written summary
Variety grain yields were uncorrelated across the two waterlogged locations.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- grain yields across varietiese0
- Setting
- two waterlogged locationse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no correlation between grain yields across varieties under waterlogging in any trials at the two waterlogged locations”
t0“wheat”
Claim · model-written summary
Soil salinity differed by up to fourfold between waterlogged sites.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- soil salinitye0
- Value
- up to 4-folde0
- Setting
- waterlogged sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“waterlogged sites differed up to 4-fold in soil salinity”
t0“wheat”
Claim · model-written summary
Accounting for salinity yielded strong correlation across environments with r2 of 0.73.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- salinity was accounted fore0
- Outcome
- good correlation across all environmentse0
- Value
- r2 = 0.73e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When salinity was accounted for, there was a good correlation across all environments (r2 = 0.73)”
t0“wheat”
Claim · model-written summary
The authors propose crown root development as a physiological basis for the tillering-tolerance relationship.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- crown roote0
- Outcome
- relationship between tillering and waterlogging tolerancee0
- Qualifier
- associated with crown root developmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A physiological basis for the relationship between tillering and waterlogging tolerance is proposed, associated with crown root development”
t0“wheat”
Claim · model-written summary
The authors recommend selecting for tiller number to improve wheat under vegetative-stage waterlogging.
- Taxon
- wheatTriticum aestivume0
- Outcome
- selection for numbers of tillerse0
- Qualifier
- when crops are waterlogged during vegetative growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“major opportunities for wheat improvement by selection for numbers of tillers when crops are waterlogged during vegetative growth”
The same questions in other papers
flooding · yield · Triticum aestivum (wheat)Positive and negative results
84 papers in the same direction as this paper · 17 in the opposite direction
- negative
- negative
- negative
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See all 102 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.