Abstract
summary Variation for K + and Na + accumulation at low salinities in hydroponic (water) culture were observed in shoots of different wheat species. Greater discrimination (in favour of K + and against Na + accumulation) was shown by hexaploid bread wheat ( Triticum aestivum L.) than by tetraploid durum wheat ( T. turgidum L.). Since Aegilops tauschii Cosson ( A. squarrosa L.), the source of the D genome in bread wheat, also exhibited high discrimination between K + and Na + , it was concluded that the character resided in the D genome. Studies of aneuploid bread wheat lines and disomic substitution lines of D genome chromosomes for their A and B genome homoeologues in durum wheat cv. Langdon revealed that the trait was controlled by the long arm of chromosome 4D. Since the aneuploid and disomic substitution lines showed better relative salt tolerance than durum wheat, but had lower yield potentials, we recombined chromosome 4D with chromosome 4B in a tetraploid wheat background using a homoeologous pairing mutant. This produced families of 4D/4B recombinant lines, some of which exhibited the enhanced K + /Na + discrimination trait. RFLP analysis confirmed that the trait was controlled by a single gene ( Kna1 ) which was completely linked to five markers on the distal third of the long arm of 4D. A second cycle of homoeologous recombination was employed to remove the distal 4D genetic material from the recombined Kna1 4B/4D chromosome and to map Kna1 in greater detail. By this strategy, Kna1 was mapped within a short 2 cM region. Genetic analysis of K + : Na + ratios showed very high LOD scores in this region for plants grown in solution culture, but lower values for plants grown in the field. In general, recombinant lines which exhibited the enhanced K + /Na + trait were slightly more tolerant of salinity in the field and in sand culture than recombinants lacking the trait. There was, however, considerable variation between individual lines. Ion discrimination and relative tolerance were also higher in a Kna1 recombinant (line no. R3) than in a kna1 recombinant (line no. R165) in sodic conditions. In these two lines the enhanced K + /Na + discrimination trait did not alter responses to low potassium or calcium supply.
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Claims 12
Claim · model-written summary
Hexaploid bread wheat showed greater K+/Na+ discrimination than tetraploid durum wheat at low salinities in hydroponic culture.
Verbatim
e0“Greater discrimination (in favour of K + and against Na + accumulation) was shown by hexaploid bread wheat ( Triticum aestivum L.) than by tetraploid durum wheat ( T. turgidum L.)”
e1“at low salinities in hydroponic (water) culture were observed in shoots of different wheat species”
Claim · model-written summary
K+ and Na+ accumulation at low salinity varied among wheat species in hydroponic culture.
- Taxon
- different wheat speciese0
- Organ / stage
- shootse0
- Treatment
- low salinitiese0
- Outcome
- Variation for K + and Na + accumulatione0
- Setting
- hydroponic (water) culturee0
Not reportedDirection
Verbatim
e0“Variation for K + and Na + accumulation at low salinities in hydroponic (water) culture were observed in shoots of different wheat species”
Claim · model-written summary
Aegilops tauschii, the D-genome source of bread wheat, showed high discrimination between K+ and Na+.
- Taxon
- Aegilops tauschii
.jpg?width=60)
Aegilops tauschiie0 - Outcome
- discrimination between K + and Na +e0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Aegilops tauschii Cosson ( A. squarrosa L.), the source of the D genome in bread wheat, also exhibited high discrimination between K + and Na +”
Claim · model-written summary
The character was concluded to reside in the D genome of bread wheat (author interpretation).
- Taxon
- bread wheat
Triticum aestivume0 - Outcome
- charactere1
- Qualifier
- resided in the D genomee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aegilops tauschii Cosson ( A. squarrosa L.), the source of the D genome in bread wheat, also exhibited high discrimination between K + and Na +”
e1“it was concluded that the character resided in the D genome”
Claim · model-written summary
In durum wheat cv. Langdon, the trait was controlled by the long arm of chromosome 4D.
- Taxon
- durum wheat
Triticum turgidum subsp. durume0 - Material
- cv. Langdone0
- Gene
- long arm of chromosome 4De0
- Outcome
- traite0
- Qualifier
- controllede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Studies of aneuploid bread wheat lines and disomic substitution lines of D genome chromosomes for their A and B genome homoeologues in durum wheat cv. Langdon revealed that the trait was controlled by the long arm of chromosome 4D”
Claim · model-written summary
A single gene, Kna1, controls the trait and is completely linked to five markers on the distal third of the long arm of chromosome 4D.
- Taxon
- wheatTriticum aestivumt0
- Gene
- Kna1e0
- Outcome
- traite0
- Qualifier
- completely linked to five markerse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RFLP analysis confirmed that the trait was controlled by a single gene ( Kna1 ) which was completely linked to five markers on the distal third of the long arm of 4D”
t0“discrimination in wheat”
Claim · model-written summary
Kna1 was mapped within a short 2 cM region.
- Taxon
- wheatTriticum aestivumt0
- Gene
- Kna1e0
- Outcome
- mappede0
- Value
- 2 cMe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By this strategy, Kna1 was mapped within a short 2 cM region”
t0“discrimination in wheat”
Claim · model-written summary
LOD scores for K+:Na+ ratios in the Kna1 region were very high for plants grown in solution culture.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- LOD scorese0
- Direction
- very highe0
- Setting
- solution culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genetic analysis of K + : Na + ratios showed very high LOD scores in this region for plants grown in solution culture, but lower values for plants grown in the field”
t0“discrimination in wheat”
Claim · model-written summary
LOD values for K+:Na+ ratios in the Kna1 region were lower for plants grown in the field.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- LOD scorese0
- Direction
- lowere0
- Setting
- the fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genetic analysis of K + : Na + ratios showed very high LOD scores in this region for plants grown in solution culture, but lower values for plants grown in the field”
t0“discrimination in wheat”
Claim · model-written summary
Recombinant lines with the enhanced K+/Na+ trait were slightly more tolerant of salinity in the field and in sand culture than recombinants lacking the trait.
- Taxon
- wheatTriticum aestivumt0
- Material
- recombinant linese0
- Treatment
- salinitye0
- Outcome
- more tolerant of salinitye0
- Direction
- more tolerante0
- Qualifier
- slightlye0
- Comparator
- recombinants lacking the traite0
- Setting
- the field and in sand culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In general, recombinant lines which exhibited the enhanced K + /Na + trait were slightly more tolerant of salinity in the field and in sand culture than recombinants lacking the trait”
t0“discrimination in wheat”
Claim · model-written summary
In sodic conditions, Kna1 recombinant line R3 had higher ion discrimination and relative tolerance than kna1 recombinant line R165.
- Taxon
- wheatTriticum aestivumt0
- Material
- Kna1 recombinant (line no. R3)e0
- Treatment
- sodic conditionse0
- Gene
- Kna1e0
- Outcome
- Ion discrimination and relative tolerancee0
- Direction
- highere0
- Comparator
- kna1 recombinant (line no. R165)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ion discrimination and relative tolerance were also higher in a Kna1 recombinant (line no. R3) than in a kna1 recombinant (line no. R165) in sodic conditions”
t0“discrimination in wheat”
Claim · model-written summary
The enhanced K+/Na+ discrimination trait did not alter responses to low potassium or calcium supply in the two lines compared.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- low potassium or calcium supplye0
- Outcome
- responsese0
- Direction
- did not altere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In these two lines the enhanced K + /Na + discrimination trait did not alter responses to low potassium or calcium supply”
t0“discrimination in wheat”
The same questions in other papers
salinity · disease · Triticum aestivum (wheat)Positive and negative results
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- negative
- negative
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See all 13 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.