Abstract
Summary The influence of NaCl and different levels of nitrogen supply (5, 10 and 15 mM Ca(NO 3 ) 2 ) on growth and physiological parameters of two Sudanese guava cultivars (white and red fruit flesh) were investigated. Under saline conditions shoot growth and leaf chlorophyll content in guava trees were reduced. However, moderate N supply improved these parameters. NaCl salinity reduced net photosynthesis rate (PN) and transpiration (T) of both guava cultivars, but moderate nitrogen supply enhanced PN and T. Stomatal resistance (R s ) was high under NaCl salinity conditions, whereas it was comperatively low for trees moderately supplied with nitrogen. The salinity-induced decrease of PN in red guava is attributed to stomatal closure. In white guava this was rather an effect of non-stomatal factors. The xylem flow rate followed similar patterns for both cultivars and for all treatments except those supplied with NaCl only. The highest flow rates were noticed for both cultivars under moderate nitrogen supply. The red guava is supposed to possess a better salt tolerance compared to white guava.
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Claims 11
Claim · model-written summary
Saline conditions reduced shoot growth and leaf chlorophyll content in guava trees.
- Taxon
- guava trees
Psidium guajavae0 - Treatment
- saline conditionse0
- Outcome
- shoot growth and leaf chlorophyll contente0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under saline conditions shoot growth and leaf chlorophyll content in guava trees were reduced”
Claim · model-written summary
Moderate nitrogen supply improved shoot growth and leaf chlorophyll content of guava under saline conditions.
- Taxon
- guavaPsidium guajavat0
- Treatment
- moderate N supplye1
- Outcome
- shoot growth and leaf chlorophyll contente0
- Direction
- improvede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under saline conditions shoot growth and leaf chlorophyll content in guava trees were reduced”
e1“moderate N supply improved these parameters”
t0“guava”
Claim · model-written summary
NaCl salinity reduced net photosynthesis rate and transpiration in both guava cultivars.
- Taxon
- guavaPsidium guajavae0
- Treatment
- NaCl salinitye0
- Outcome
- net photosynthesis rate (PN) and transpiration (T)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl salinity reduced net photosynthesis rate (PN) and transpiration (T) of both guava cultivars”
Claim · model-written summary
Moderate nitrogen supply enhanced net photosynthesis rate and transpiration of guava.
- Taxon
- guavaPsidium guajavat0
- Treatment
- moderate nitrogen supplye0
- Outcome
- PN and Te0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but moderate nitrogen supply enhanced PN and T”
t0“guava”
Claim · model-written summary
Stomatal resistance of guava was high under NaCl salinity.
- Taxon
- guavaPsidium guajavat0
- Treatment
- NaCl salinitye0
- Outcome
- Stomatal resistancee0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stomatal resistance (R s ) was high under NaCl salinity conditions”
t0“guava”
Claim · model-written summary
Stomatal resistance was comparatively low in guava trees moderately supplied with nitrogen.
- Taxon
- guavaPsidium guajavat0
- Treatment
- moderately supplied with nitrogene1
- Outcome
- Stomatal resistancee0
- Direction
- lowe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stomatal resistance (R s )”
e1“whereas it was comperatively low for trees moderately supplied with nitrogen”
t0“guava”
Claim · model-written summary
The salinity-induced decrease of net photosynthesis in red guava is attributed to stomatal closure.
Verbatim
e0“The salinity-induced decrease of PN in red guava is attributed to stomatal closure”
Claim · model-written summary
In white guava the salinity-induced decrease of net photosynthesis was rather an effect of non-stomatal factors.
Verbatim
e0“salinity-induced decrease of PN”
e1“In white guava this was rather an effect of non-stomatal factors”
Claim · model-written summary
Xylem flow rate followed similar patterns in both guava cultivars and all treatments except those supplied with NaCl only.
- Taxon
- guavaPsidium guajavat0
- Outcome
- xylem flow ratee0
- Qualifier
- except those supplied with NaCl onlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The xylem flow rate followed similar patterns for both cultivars and for all treatments except those supplied with NaCl only”
t0“guava”
Claim · model-written summary
The highest xylem flow rates were found in both guava cultivars under moderate nitrogen supply.
- Taxon
- guavaPsidium guajavat0
- Outcome
- highest flow ratese0
- Qualifier
- under moderate nitrogen supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest flow rates were noticed for both cultivars under moderate nitrogen supply”
t0“guava”
Claim · model-written summary
Red guava is supposed to have a better salt tolerance than white guava.
Verbatim
e0“The red guava is supposed to possess a better salt tolerance compared to white guava”
The same questions in other papers
salinity · physiology: pigments · Psidium guajava (guava)Results agree
1 paper in the same direction as this paper
- negative
nitrogen · physiology: pigments · Psidium guajava (guava)Results agree
1 paper in the same direction as this paper
- positive
nitrogen · disease · Psidium guajava (guava)Results agree
1 paper in the same direction as this paper
- positive
salinity · physiology: photosynthesis · Psidium guajava (guava)Results agree
7 papers in the same direction as this paper
- negative
- negative
- negative
4 papers more in this group
See all 8 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.