Abstract
The effects of light, temperature, and salinity on growth, net CO2 exchange and leaf anatomy of Distichlis spicata were investigated in controlled environment chambers. When plants were grown at low light, growth rates were significantly reduced by high substrate salinity or low temperature. However, when plants were grown at high light, growth rates were not significantly affected by temperature or salinity. The capacity for high light to overcome depressed growth at high salinity cannot be explained completely by rates of net photosynthesis, since high salinity caused decreases in net photosynthesis at all environmental conditions. This salinity-induced decrease in net photosynthesis was caused largely by stomatal closure, although plants grown at low temperature and low light showed significant increases in internal leaf resistance to CO2 exchange. Increased salinity resulted in generally thicker leaves with lower stomatal density but no significant differences in the ratio of mesophyll cell surface area to leaf area. Salinity and light during growth did not significantly affect rates of dark respiration. The mechanisms by which Distichlis spicata tolerates salt appear to be closely coulpled to the utilization of light energy. Salt-induced leaf succulence is of questionable importance to gas exchange at high salinity in this C4 species.
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Claims 14
Claim · model-written summary
At low light, high salinity significantly reduced growth rates.
- Taxon
- Distichlis spicata
.jpg?width=60)
Distichlis spicatat0 - Treatment
- high substrate salinitye0
- Outcome
- growth ratese0
- Direction
- reducede0
- Comparator
- low lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“When plants were grown at low light, growth rates were significantly reduced by high substrate salinity or low temperature”
t0“Distichlis spicata”
Claim · model-written summary
At low light, low temperature significantly reduced growth rates.
- Taxon
- Distichlis spicataDistichlis spicatat0
- Treatment
- low temperaturee0
- Outcome
- growth ratese0
- Direction
- reducede0
- Comparator
- low lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When plants were grown at low light, growth rates were significantly reduced by high substrate salinity or low temperature”
t0“Distichlis spicata”
Claim · model-written summary
At high light, temperature did not significantly affect growth rates.
- Taxon
- Distichlis spicataDistichlis spicatat0
- Treatment
- temperaturee0
- Outcome
- growth ratese0
- Comparator
- high lighte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when plants were grown at high light, growth rates were not significantly affected by temperature or salinity”
t0“Distichlis spicata”
Claim · model-written summary
At high light, salinity did not significantly affect growth rates.
- Taxon
- Distichlis spicataDistichlis spicatat0
- Treatment
- salinitye0
- Outcome
- growth ratese0
- Comparator
- high lighte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when plants were grown at high light, growth rates were not significantly affected by temperature or salinity”
t0“Distichlis spicata”
Claim · model-written summary
High salinity decreased net photosynthesis across environmental conditions.
- Taxon
- Distichlis spicataDistichlis spicatat0
- Treatment
- high salinitye0
- Outcome
- net photosynthesise0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high salinity caused decreases in net photosynthesis at all environmental conditions”
t0“Distichlis spicata”
Claim · model-written summary
Stomatal closure largely accounted for salinity-induced lower net photosynthesis.
- Taxon
- Distichlis spicataDistichlis spicatat0
- Outcome
- decrease in net photosynthesise0
- Qualifier
- stomatal closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This salinity-induced decrease in net photosynthesis was caused largely by stomatal closure”
t0“Distichlis spicata”
Claim · model-written summary
Low temperature and low light increased internal leaf resistance to CO2 exchange significantly.
- Taxon
- Distichlis spicataDistichlis spicatat0
- Treatment
- low temperature and low lighte0
- Outcome
- internal leaf resistance to CO2 exchangee0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plants grown at low temperature and low light showed significant increases in internal leaf resistance to CO2 exchange”
t0“Distichlis spicata”
Claim · model-written summary
Increased salinity produced thicker leaves.
- Taxon
- Distichlis spicataDistichlis spicatat0
- Treatment
- Increased salinitye0
- Outcome
- thicker leavese0
- Direction
- thickere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased salinity resulted in generally thicker leaves with lower stomatal density”
t0“Distichlis spicata”
Claim · model-written summary
Increased salinity lowered stomatal density.
- Taxon
- Distichlis spicataDistichlis spicatat0
- Treatment
- Increased salinitye0
- Outcome
- stomatal densitye0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased salinity resulted in generally thicker leaves with lower stomatal density”
t0“Distichlis spicata”
Claim · model-written summary
Salinity did not significantly change mesophyll cell surface area relative to leaf area.
- Taxon
- Distichlis spicataDistichlis spicatat0
- Treatment
- salinitye1
- Outcome
- ratio of mesophyll cell surface area to leaf areae0
- Direction
- no significant differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant differences in the ratio of mesophyll cell surface area to leaf area”
t0“Distichlis spicata”
e1“high substrate salinity”
Claim · model-written summary
Salinity did not significantly affect dark respiration.
- Taxon
- Distichlis spicataDistichlis spicatat0
- Treatment
- Salinitye0
- Outcome
- rates of dark respiratione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity and light during growth did not significantly affect rates of dark respiration”
t0“Distichlis spicata”
Claim · model-written summary
Light during growth did not significantly affect dark respiration.
- Taxon
- Distichlis spicataDistichlis spicatat0
- Treatment
- lighte0
- Outcome
- rates of dark respiratione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity and light during growth did not significantly affect rates of dark respiration”
t0“Distichlis spicata”
Claim · model-written summary
Salt tolerance appears closely coupled to light-energy use.
- Taxon
- Distichlis spicataDistichlis spicatae0
- Outcome
- tolerates salte0
- Qualifier
- utilization of light energye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mechanisms by which Distichlis spicata tolerates salt appear to be closely coulpled to the utilization of light energy”
Claim · model-written summary
The authors question whether salt-induced succulence helps gas exchange at high salinity.
- Taxon
- Distichlis spicataDistichlis spicatat0
- Outcome
- gas exchange at high salinitye0
- Qualifier
- Salt-induced leaf succulencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt-induced leaf succulence is of questionable importance to gas exchange at high salinity in this C4 species”
t0“Distichlis spicata”
The same questions in other papers
salinity · growth · Distichlis spicata (saltgrass)Positive and negative results
4 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
5 papers more in this group
See all 9 papers →salinity · physiology: photosynthesis · Distichlis spicata (saltgrass)Results agree
1 paper in the same direction as this paper
- no effect
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.