Abstract
Variability in the response to salinity within Chloris gayana (Rhodes grass) germplasm was evaluated under field conditions, and random amplified polymorphic DNA (RAPD) markers were used to assess genetic relatedness among cultivars/accessions. RAPD analysis showed a clustering of cultivars of known relatedness: cv. Pioneer and accessions Local and Trancas (derived from an old Pioneer pasture established in saline soil) belonged to the same cluster, Katambora to another and tetraploid Boma and Callide could be further separated, Boma belonging to a fourth, distant cluster. Field experiments were laid out in two types of plots: control [with electrical conductivity of the saturation extract (EC) = 3·64 dS m −1 ] and saline (EC=13·10 dS m −1 ) and two experiments were carried out: one to evaluate the effects of salinity on emergence and establishment, and the other, with a uniform number of plants per plot, to evaluate yield under saline conditions. All cultivars/accessions had salinity‐associated decreases in dry‐matter (DM) production during the establishment phase. After this stage, 1‐year DM yield was similar in all cultivars within each salinity level and production in the saline plots was significantly lower than in controls only in cv. Callide and accession Trancas. Second‐year production in the non‐saline plots increased by 30% on average over the previous year, whereas an average 40% reduction was observed in the saline plots. Thus, salinity had a negative effect on Rhodes grass establishment and persistence. The cultivars could not be ranked unequivocally by production under saline conditions, but tetraploids Boma and Callide may be said to be less tolerant than the rest on the basis of an increased proportion of dead leaves and decreased number of stolons observed in the saline plot.
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Claims 11
Claim · model-written summary
RAPD markers clustered related cultivars and separated others.
- Taxon
- Chloris gayana
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Chloris gayanat0 - Outcome
- clustering of cultivars of known relatednesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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Schema note from the model: taxon from title
Verbatim
e0“RAPD analysis showed a clustering of cultivars of known relatedness: cv. Pioneer and accessions Local and Trancas (derived from an old Pioneer pasture established in saline soil) belonged to the same cluster, Katambora to another and tetraploid Boma and Callide could be further separated, Boma belonging to a fourth, distant cluster.”
t0“Chloris gayana”
Claim · model-written summary
All cultivars had reduced dry matter production during saline establishment.
- Taxon
- Chloris gayanaChloris gayanat0
- Treatment
- salinitye0
- Outcome
- dry‐matter (DM) productione0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: taxon from title
Verbatim
e0“All cultivars/accessions had salinity‐associated decreases in dry‐matter (DM) production during the establishment phase.”
t0“Chloris gayana”
Claim · model-written summary
After establishment, annual dry matter yield was similar among cultivars within each salinity level.
- Taxon
- Chloris gayanaChloris gayanat0
- Outcome
- 1‐year DM yielde0
- Direction
- similare0
- Comparator
- all cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: taxon from title
Verbatim
e0“After this stage, 1‐year DM yield was similar in all cultivars within each salinity level”
t0“Chloris gayana”
Claim · model-written summary
Callide yield was significantly lower in saline than control plots.
- Taxon
- Chloris gayanaChloris gayanat0
- Material
- cv. Callidee0
- Treatment
- saline plotse0
- Outcome
- productione0
- Direction
- lowere0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: taxon from title
Verbatim
e0“production in the saline plots was significantly lower than in controls only in cv. Callide and accession Trancas.”
t0“Chloris gayana”
Claim · model-written summary
Trancas yield was significantly lower in saline than control plots.
- Taxon
- Chloris gayanaChloris gayanat0
- Material
- accession Trancase0
- Treatment
- saline plotse0
- Outcome
- productione0
- Direction
- lowere0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: taxon from title
Verbatim
e0“production in the saline plots was significantly lower than in controls only in cv. Callide and accession Trancas.”
t0“Chloris gayana”
Claim · model-written summary
Second-year production rose 30% in non-saline plots versus the previous year.
- Taxon
- Chloris gayanaChloris gayanat0
- Outcome
- Second‐year productione0
- Direction
- increasede0
- Value
- 30%e0
- Comparator
- previous yeare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: taxon from title
Verbatim
e0“Second‐year production in the non‐saline plots increased by 30% on average over the previous year”
t0“Chloris gayana”
Claim · model-written summary
Second-year production fell 40% in saline plots versus the previous year.
- Taxon
- Chloris gayanaChloris gayanat0
- Treatment
- saline plotse0
- Outcome
- productione1
- Direction
- reductione0
- Value
- 40%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: taxon from title
Verbatim
e0“whereas an average 40% reduction was observed in the saline plots.”
t0“Chloris gayana”
e1“All cultivars/accessions had salinity‐associated decreases in dry‐matter (DM) production during the establishment phase.”
Claim · model-written summary
Boma had more dead leaves in saline plots, suggesting lower tolerance.
- Taxon
- Chloris gayanaChloris gayanat0
- Material
- Bomae0
- Outcome
- proportion of dead leavese0
- Direction
- increasede0
- Setting
- saline plote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: taxon from title
Verbatim
e0“tetraploids Boma and Callide may be said to be less tolerant than the rest on the basis of an increased proportion of dead leaves and decreased number of stolons observed in the saline plot.”
t0“Chloris gayana”
Claim · model-written summary
Callide had more dead leaves in saline plots, suggesting lower tolerance.
- Taxon
- Chloris gayanaChloris gayanat0
- Material
- Callidee0
- Outcome
- proportion of dead leavese0
- Direction
- increasede0
- Setting
- saline plote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: taxon from title
Verbatim
e0“tetraploids Boma and Callide may be said to be less tolerant than the rest on the basis of an increased proportion of dead leaves and decreased number of stolons observed in the saline plot.”
t0“Chloris gayana”
Claim · model-written summary
Boma had fewer stolons in saline plots.
- Taxon
- Chloris gayanaChloris gayanat0
- Material
- Bomae0
- Outcome
- number of stolonse0
- Direction
- decreasede0
- Setting
- saline plote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: taxon from title
Verbatim
e0“tetraploids Boma and Callide may be said to be less tolerant than the rest on the basis of an increased proportion of dead leaves and decreased number of stolons observed in the saline plot.”
t0“Chloris gayana”
Claim · model-written summary
Callide had fewer stolons in saline plots.
- Taxon
- Chloris gayanaChloris gayanat0
- Material
- Callidee0
- Outcome
- number of stolonse0
- Direction
- decreasede0
- Setting
- saline plote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: taxon from title
Verbatim
e0“tetraploids Boma and Callide may be said to be less tolerant than the rest on the basis of an increased proportion of dead leaves and decreased number of stolons observed in the saline plot.”
t0“Chloris gayana”
The same questions in other papers
salinity · yield · Chloris gayanaResults agree
3 papers in the same direction as this paper
- negative
- negative
- negative
salinity · growth · Chloris gayanaResults agree
5 papers in the same direction as this paper
- negative
- negative
- negative
2 papers more in this group
See all 6 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.