Abstract
Metal stress is one of the major restrictions for agricultural production.A pot experiment was set-up to appraise modulation in growth, oxidative defense, secondary metabolism and relative gene expression of two tomato cultivars viz., Roma (sensitive) and Nagina (tolerant) at flowering stage in response to different lead (Pb 2+ ) regimes (160, 320, 640 and 1280 M).The results showed that Pb 2+ stress (1280 M Pb) caused a considerable reduction in growth attributes, chlorophyll (Chl.)pigments and ascorbic acid contents, and increase in malondialdehyde (MDA), hydrogen peroxide (H 2 O 2 ), and total soluble protein (TSP) contents in both cultivars.A significant enhancement in ascorbate peroxidase (APX), peroxidase (POD), catalase (CAT) activities and Cat2 gene expression was documented in Pb 2+ stressed tomato plants.Fruit quality of Nagina was better than Roma cultivar.In this context, higher fruit ash contents, protein contents, fructose and glucose contents were observed in Nagina while Roma was inferior in this regard when under Pb 2+ stress.Furthermore, Pb 2+ reduced the fresh and dry biomass, moisture, fiber content and mineral (Na + , K and Ca) uptake in tomato fruits of both cultivars.The results indicated that significant amount of Pb 2+ accumulates in the root compared with its concentration in shoot and leaves while only a small amount of Pb 2+ reaches the fruit.The exposure to Pb 2+ caused significant changes in Cat2 gene transcripts indicating the contribution of this gene in Pb 2+ tolerance.The sensitive cultivar exhibited higher oxidative damage, decreases in the concentration of essential nutrients, poor oxidative defense system, and thus had low quality fruit.
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Claims 10
Claim · model-written summary
Lead stress reduced growth attributes and chlorophyll and ascorbic acid contents in both cultivars.
- Taxon
- Tomato
Solanum lycopersicumt0 - Treatment
- Pb 2+ stress (1280 M Pb)e0
- Outcome
- growth attributes, chlorophyll (Chl.)pigments and ascorbic acid contentse0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pb 2+ stress (1280 M Pb) caused a considerable reduction in growth attributes, chlorophyll (Chl.)pigments and ascorbic acid contents”
t0“Tomato”
Claim · model-written summary
Lead stress increased malondialdehyde, hydrogen peroxide and total soluble protein contents.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- Leadt0
- Outcome
- malondialdehyde (MDA), hydrogen peroxide (H 2 O 2 ), and total soluble protein (TSP) contentse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increase in malondialdehyde (MDA), hydrogen peroxide (H 2 O 2 ), and total soluble protein (TSP) contents in both cultivars”
t0“Lead Induced Modulation in Growth, Chlorophyll Pigment, Nutrient Uptake, Antioxidant Enzyme Regulation, Gene Expression and Fruit Quality in two Tomato Cultivars”
Claim · model-written summary
Lead stress significantly enhanced APX, POD and CAT activities.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- Pb 2+e0
- Outcome
- ascorbate peroxidase (APX), peroxidase (POD), catalase (CAT) activitiese0
- Direction
- enhancemente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant enhancement in ascorbate peroxidase (APX), peroxidase (POD), catalase (CAT) activities and Cat2 gene expression was documented in Pb 2+ stressed tomato plants”
Claim · model-written summary
Lead stress significantly enhanced Cat2 gene expression.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- Pb 2+e0
- Gene
- Cat2e0
- Outcome
- Cat2 gene expressione0
- Direction
- enhancemente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant enhancement in ascorbate peroxidase (APX), peroxidase (POD), catalase (CAT) activities and Cat2 gene expression was documented in Pb 2+ stressed tomato plants”
Claim · model-written summary
Nagina fruit quality was better than Roma.
- Taxon
- TomatoSolanum lycopersicumt0
- Material
- Naginae0
- Outcome
- Fruit qualitye0
- Direction
- bettere0
- Comparator
- Romae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit quality of Nagina was better than Roma cultivar”
t0“Tomato”
Claim · model-written summary
Under lead stress Nagina fruit had higher ash, protein, fructose and glucose contents than Roma.
- Taxon
- TomatoSolanum lycopersicumt0
- Material
- Naginae0
- Treatment
- Pb 2+ stresse0
- Outcome
- fruit ash contents, protein contents, fructose and glucose contentse0
- Direction
- highere0
- Comparator
- Romae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher fruit ash contents, protein contents, fructose and glucose contents were observed in Nagina while Roma was inferior in this regard when under Pb 2+ stress”
t0“Tomato”
Claim · model-written summary
Lead reduced fresh and dry biomass and moisture and fiber content in tomato fruit.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- fruitse0
- Treatment
- Pb 2+e0
- Outcome
- fresh and dry biomass, moisture, fiber contente0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pb 2+ reduced the fresh and dry biomass, moisture, fiber content and mineral (Na + , K and Ca) uptake in tomato fruits of both cultivars”
Claim · model-written summary
Lead reduced sodium, potassium and calcium uptake in tomato fruit.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- fruitse0
- Treatment
- Pb 2+e0
- Outcome
- mineral (Na + , K and Ca) uptakee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pb 2+ reduced the fresh and dry biomass, moisture, fiber content and mineral (Na + , K and Ca) uptake in tomato fruits of both cultivars”
Claim · model-written summary
Lead accumulated more in tomato roots than in shoots and leaves, with little reaching fruit.
- Taxon
- TomatoSolanum lycopersicumt0
- Organ / stage
- roote0
- Outcome
- Pb 2+ accumulates in the roote0
- Direction
- significant amounte0
- Comparator
- shoot and leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant amount of Pb 2+ accumulates in the root compared with its concentration in shoot and leaves while only a small amount of Pb 2+ reaches the fruit”
t0“Tomato”
Claim · model-written summary
The sensitive cultivar showed greater oxidative damage, poorer defense and lower fruit quality.
- Taxon
- TomatoSolanum lycopersicumt0
- Material
- sensitive cultivare0
- Outcome
- higher oxidative damage, decreases in the concentration of essential nutrients, poor oxidative defense system, and thus had low quality fruite0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sensitive cultivar exhibited higher oxidative damage, decreases in the concentration of essential nutrients, poor oxidative defense system, and thus had low quality fruit”
t0“Tomato”
The same questions in other papers
lead atom · physiology: oxidative · Solanum lycopersicum (tomato)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- negative
1 paper more in this group
See all 5 papers →lead(2+) · physiology: antioxidant enzymes · Solanum lycopersicum (tomato)Results agree
1 paper in the same direction as this paper
- positive
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.