Abstract
This experiment was conducted at the National Research Centre, Dokki, Cairo, Egypt during 2006 and 2007 winter season to evaluate the effects of spraying with tryptophan (TP) and nicotinic acids (NA) on onion plants grown under varying degree of salinity stress (irrigation water with 3000 and 6000 ppm salinity) as compared to tap water (300 ppm) irrigation. Irrigation by high salinity water decreased the number of leaves, mean bulb diameter, fresh and dry weight of bulb and whole plant. Foliar application of TP and NA significantly increased the top height and fresh weight, and bulb dry weight. The above beneficial effects were greater in the plants sprayed with NA as compared to those of the plants received TP spray. At the lower salinity level (3000 ppm), TP was more effective than NA in mitigating the negative effects of salinity stress. At the high salinity stress (6000 ppm), however, the converse was evident. The electrolyte leakage (EL) was not influenced by 3000 ppm salinity irrigation water as compared to that of the plants which received tap water (300 ppm) irrigations. However, it increased significantly in the plants irrigated by 6000 ppm salinity water. Lipid peroxidation (LP) and EL were significantly lower in the plants sprayed with TP or tapwater. In addition, spraying of NA or TP increased the plant growth and biomass weight. Therefore, the above foliar sprays appear to mitigate the negative effects of increased salinity.
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Claims 10
Claim · model-written summary
High salinity irrigation decreased the number of leaves and mean bulb diameter of onion.
- Taxon
- Onion Plants
Allium cepat0 - Treatment
- Irrigation by high salinity watere0
- Outcome
- number of leaves, mean bulb diametere0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion Plants Response to Salinity Stress”
e0“Irrigation by high salinity water decreased the number of leaves, mean bulb diameter, fresh and dry weight of bulb and whole plant”
Claim · model-written summary
High salinity irrigation decreased fresh and dry weight of onion bulb and whole plant.
- Taxon
- Onion PlantsAllium cepat0
- Treatment
- Irrigation by high salinity watere0
- Outcome
- fresh and dry weight of bulb and whole plante0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion Plants Response to Salinity Stress”
e0“Irrigation by high salinity water decreased the number of leaves, mean bulb diameter, fresh and dry weight of bulb and whole plant”
Claim · model-written summary
Foliar TP and NA significantly increased top height, fresh weight and bulb dry weight of onion.
- Taxon
- Onion PlantsAllium cepat0
- Treatment
- Foliar application of TP and NAe1
- Outcome
- top height and fresh weight, and bulb dry weighte1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion Plants Response to Salinity Stress”
e1“Foliar application of TP and NA significantly increased the top height and fresh weight, and bulb dry weight”
Claim · model-written summary
Foliar NA gave greater beneficial effects than foliar TP in onion.
- Taxon
- Onion PlantsAllium cepat0
- Treatment
- sprayed with NAe2
- Outcome
- beneficial effectse2
- Direction
- greatere2
- Comparator
- TP spraye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion Plants Response to Salinity Stress”
e2“The above beneficial effects were greater in the plants sprayed with NA as compared to those of the plants received TP spray”
Claim · model-written summary
At 3000 ppm salinity, foliar TP was more effective than NA in mitigating salinity stress.
- Taxon
- Onion PlantsAllium cepat0
- Treatment
- TPe3
- Outcome
- mitigating the negative effects of salinity stresse3
- Direction
- more effectivee3
- Qualifier
- At the lower salinity level (3000 ppm)e3
- Comparator
- NAe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion Plants Response to Salinity Stress”
e3“At the lower salinity level (3000 ppm), TP was more effective than NA in mitigating the negative effects of salinity stress”
Claim · model-written summary
At 6000 ppm salinity, the converse held: foliar NA was more effective than TP in mitigating salinity stress.
- Taxon
- Onion PlantsAllium cepat0
- Treatment
- NAe3
- Outcome
- mitigating the negative effects of salinity stresse3
- Direction
- conversee4
- Qualifier
- At the high salinity stress (6000 ppm)e4
- Comparator
- TPe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion Plants Response to Salinity Stress”
e3“At the lower salinity level (3000 ppm), TP was more effective than NA in mitigating the negative effects of salinity stress”
e4“At the high salinity stress (6000 ppm), however, the converse was evident”
Claim · model-written summary
Electrolyte leakage was not influenced by 3000 ppm salinity irrigation water compared with tap water.
- Taxon
- Onion PlantsAllium cepat0
- Treatment
- 3000 ppm salinity irrigation watere5
- Outcome
- electrolyte leakage (EL)e5
- Direction
- not influencede5
- Comparator
- tap water (300 ppm)e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion Plants Response to Salinity Stress”
e5“The electrolyte leakage (EL) was not influenced by 3000 ppm salinity irrigation water as compared to that of the plants which received tap water (300 ppm) irrigations. However, it increased significantly in the plants irrigated by 6000 ppm salinity water”
Claim · model-written summary
Electrolyte leakage increased significantly at 6000 ppm salinity.
- Taxon
- Onion PlantsAllium cepat0
- Treatment
- 6000 ppm salinity watere5
- Outcome
- electrolyte leakage (EL)e5
- Direction
- increased significantlye5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion Plants Response to Salinity Stress”
e5“The electrolyte leakage (EL) was not influenced by 3000 ppm salinity irrigation water as compared to that of the plants which received tap water (300 ppm) irrigations. However, it increased significantly in the plants irrigated by 6000 ppm salinity water”
Claim · model-written summary
Foliar TP reduced lipid peroxidation and electrolyte leakage significantly.
- Taxon
- Onion PlantsAllium cepat0
- Treatment
- sprayed with TPe6
- Outcome
- Lipid peroxidation (LP) and ELe6
- Direction
- lowere6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion Plants Response to Salinity Stress”
e6“Lipid peroxidation (LP) and EL were significantly lower in the plants sprayed with TP or tapwater”
Claim · model-written summary
Foliar spraying of NA or TP increased plant growth and biomass weight of onion.
- Taxon
- Onion PlantsAllium cepat0
- Treatment
- spraying of NA or TPe7
- Outcome
- plant growth and biomass weighte7
- Direction
- increasede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Onion Plants Response to Salinity Stress”
e7“In addition, spraying of NA or TP increased the plant growth and biomass weight”
The same questions in other papers
tryptophan · growth · Allium cepa (onion)Results agree
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3 papers in the same direction as this paper
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8 of 9 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.