Abstract
Rhodes grass ( Chloris gayana Kunth) is widely cultivated in the semi-arid tropics and favoured for salt tolerance; nevertheless, productivity decreases significantly under saline conditions, especially in tetraploid cultivars. The purpose of this work was to explore, in the tetraploid cultivar Boma, the physiological causes for such decrease. Experiments were carried out in vegetative plants in the greenhouse. At high salinity (200 mM NaCl), an early reduction in leaf area expansion was observed, and, later, decreased dry matter accumulation, suggesting that the central effect of salinity was a limitation of leaf growth. This was evaluated in 2 closely related Boma clones, exhibiting different degrees of salt tolerance. Growth, ion accumulation and excretion, sugars, and proline concentrations were measured under a range of salt concentrations (0–200 mM NaCl). Differences between the clones in leaf expansion were expressed only at high salinity, but were not associated with differences in water potential or hydraulic conductance in the expanding region. At all salinity levels, the proportion of dry leaves was higher in the clone which also had lower salt gland density and Na excretion rates. Less efficient Na extrusion, associated with high oxidative stress, may be the main cause for leaf senescence and differences in productivity between these clones.
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Claims 6
Claim · model-written summary
High salinity caused an early reduction in leaf area expansion.
- Taxon
- Chloris gayana
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Chloris gayanat0 - Material
- Bomat0
- Treatment
- high salinity (200 mM NaCl)e0
- Outcome
- leaf area expansione0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
%2C_Mexico.jpg?width=500)
Verbatim
e0“At high salinity (200 mM NaCl), an early reduction in leaf area expansion was observed”
t0“Boma, a tetraploid Chloris gayana”
Claim · model-written summary
High salinity later decreased dry matter accumulation.
- Taxon
- Chloris gayanaChloris gayanat0
- Material
- Bomat0
- Treatment
- high salinity (200 mM NaCl)e0
- Outcome
- dry matter accumulatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At high salinity (200 mM NaCl), an early reduction in leaf area expansion was observed, and, later, decreased dry matter accumulation”
t0“Boma, a tetraploid Chloris gayana”
Claim · model-written summary
The clones differed in leaf expansion only at high salinity.
- Taxon
- Chloris gayanaChloris gayanat0
- Material
- Bomat0
- Outcome
- leaf expansione0
- Qualifier
- only at high salinitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences between the clones in leaf expansion were expressed only at high salinity”
t0“Boma, a tetraploid Chloris gayana”
Claim · model-written summary
Leaf-expansion differences were not associated with water potential or hydraulic conductance.
- Taxon
- Chloris gayanaChloris gayanat0
- Material
- Bomat0
- Outcome
- leaf expansione1
- Qualifier
- not associated with differences in water potential or hydraulic conductance in the expanding regione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but were not associated with differences in water potential or hydraulic conductance in the expanding region.”
e1“Differences between the clones in leaf expansion were expressed only at high salinity”
t0“Boma, a tetraploid Chloris gayana”
Claim · model-written summary
The clone with lower salt-gland density and Na excretion had a higher dry-leaf proportion at all salinities.
- Taxon
- Chloris gayanaChloris gayanat0
- Material
- Bomat0
- Outcome
- proportion of dry leavese0
- Direction
- highere0
- Qualifier
- lower salt gland density and Na excretion ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At all salinity levels, the proportion of dry leaves was higher in the clone which also had lower salt gland density and Na excretion rates.”
t0“Boma, a tetraploid Chloris gayana”
Claim · model-written summary
Less efficient Na extrusion with oxidative stress may explain leaf senescence and clone productivity differences.
- Taxon
- Chloris gayanaChloris gayanat0
- Material
- Bomat0
- Outcome
- leaf senescence and differences in productivitye0
- Qualifier
- Less efficient Na extrusion, associated with high oxidative stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Less efficient Na extrusion, associated with high oxidative stress, may be the main cause for leaf senescence and differences in productivity between these clones.”
t0“Boma, a tetraploid Chloris gayana”
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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.