Abstract
Many anthropogenic activities (smelters, mines and municipal waste) enhance the heavy metal toxicity in soil and water and it is gradually accumulated in plants, and finally through food chain it reaches to human beings. To investigate hazardous impact of excess nickel on growth, biomass, yield and metabolism of rice (Oryza sativa L) the plants were grown in refined sand at 0.0001mM (control), 0.05, 0.10, 0.20, 0.40, and 0.50 mM nickel (Ni) supply. After 16 days of treatment the excess supply of Ni(>0.50mM) reduced biomass, photosynthetic pigments (both chlorophyll a and b), Hill reaction activity, water soluble proteins, activity of catalase (CAT), and enhanced the activity of peroxidase (POX), ribonuclease and acid phosphatase in rice leaves. The antioxidative regulation was inhibited through CAT, although increased activity of POX supported the plants in overcoming the toxic effect of nickel. At 112 days (70 days after Ni treatment) the accumulation of iron in shoot and root was reduced. Phosphorus was significantly increased in both shoot and root. Sulphur accumulation was increased in panicle, leaves, shoot and root. Nickel accumulation in different plant parts was increased many fold (as in leaves it was increased about 25 times, in stem 18 times and in roots it was 17 times) in 0.50 mM Ni supply in comparision to control. Rice appeared very prone to nickel toxicity as Ni supply beyond 0.050 mM resulted into complete loss of economic yield due to inhibited flowering and poor panicle numbers.
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Claims 10
Claim · model-written summary
Excess nickel reduced rice biomass, photosynthetic pigments, Hill reaction activity and water soluble proteins after 16 days.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- leavese0
- Treatment
- excess supply of Ni(>0.50mM)e0
- Outcome
- biomass, photosynthetic pigments (both chlorophyll a and b), Hill reaction activity, water soluble proteinse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 16 days of treatment the excess supply of Ni(>0.50mM) reduced biomass, photosynthetic pigments (both chlorophyll a and b), Hill reaction activity, water soluble proteins, activity of catalase (CAT), and enhanced the activity of peroxidase (POX), ribonuclease and acid phosphatase in rice leaves.”
Claim · model-written summary
Excess nickel reduced catalase activity in rice leaves.
- Taxon
- riceOryza sativae0
- Treatment
- excess supply of Ni(>0.50mM)e0
- Outcome
- activity of catalase (CAT)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 16 days of treatment the excess supply of Ni(>0.50mM) reduced biomass, photosynthetic pigments (both chlorophyll a and b), Hill reaction activity, water soluble proteins, activity of catalase (CAT), and enhanced the activity of peroxidase (POX), ribonuclease and acid phosphatase in rice leaves.”
Claim · model-written summary
Excess nickel enhanced peroxidase, ribonuclease and acid phosphatase activities in rice leaves.
- Taxon
- riceOryza sativae0
- Treatment
- excess supply of Ni(>0.50mM)e0
- Outcome
- activity of peroxidase (POX), ribonuclease and acid phosphatasee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 16 days of treatment the excess supply of Ni(>0.50mM) reduced biomass, photosynthetic pigments (both chlorophyll a and b), Hill reaction activity, water soluble proteins, activity of catalase (CAT), and enhanced the activity of peroxidase (POX), ribonuclease and acid phosphatase in rice leaves.”
Claim · model-written summary
Nickel exposure reduced iron accumulation in rice shoots and roots at 112 days.
- Taxon
- RiceOryza sativat0
- Treatment
- Ni treatmente0
- Outcome
- accumulation of iron in shoot and roote0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 112 days (70 days after Ni treatment) the accumulation of iron in shoot and root was reduced.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Nickel exposure significantly increased phosphorus in rice shoots and roots.
- Taxon
- RiceOryza sativat0
- Organ / stage
- shoot and roote0
- Outcome
- Phosphoruse0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus was significantly increased in both shoot and root.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Sulphur accumulation increased in rice panicles, leaves, shoots and roots.
- Taxon
- RiceOryza sativat0
- Organ / stage
- panicle, leaves, shoot and roote0
- Outcome
- Sulphur accumulatione0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sulphur accumulation was increased in panicle, leaves, shoot and root.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
At 0.50 mM nickel, rice leaf nickel accumulation increased about 25 times relative to control.
- Taxon
- RiceOryza sativat0
- Treatment
- 0.50 mM Ni supplye0
- Outcome
- leavese0
- Direction
- increasede0
- Value
- 25 timese0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nickel accumulation in different plant parts was increased many fold (as in leaves it was increased about 25 times, in stem 18 times and in roots it was 17 times) in 0.50 mM Ni supply in comparision to control.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
At 0.50 mM nickel, rice stem nickel accumulation increased 18 times relative to control.
- Taxon
- RiceOryza sativat0
- Organ / stage
- steme0
- Treatment
- 0.50 mM Ni supplye0
- Outcome
- Nickel accumulation in different plant partse0
- Direction
- increasede0
- Value
- 18 timese0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nickel accumulation in different plant parts was increased many fold (as in leaves it was increased about 25 times, in stem 18 times and in roots it was 17 times) in 0.50 mM Ni supply in comparision to control.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
At 0.50 mM nickel, rice root nickel accumulation increased 17 times relative to control.
- Taxon
- RiceOryza sativat0
- Organ / stage
- rootse0
- Treatment
- 0.50 mM Ni supplye0
- Outcome
- Nickel accumulation in different plant partse0
- Direction
- increasede0
- Value
- 17 timese0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nickel accumulation in different plant parts was increased many fold (as in leaves it was increased about 25 times, in stem 18 times and in roots it was 17 times) in 0.50 mM Ni supply in comparision to control.”
t0“Rice (Oryza sativa L.)”
Claim · model-written summary
Nickel supply beyond 0.050 mM caused complete loss of rice economic yield with inhibited flowering and poor panicle numbers.
- Taxon
- RiceOryza sativae0
- Treatment
- Ni supply beyond 0.050 mMe0
- Outcome
- economic yielde0
- Direction
- complete losse0
- Qualifier
- inhibited flowering and poor panicle numberse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice appeared very prone to nickel toxicity as Ni supply beyond 0.050 mM resulted into complete loss of economic yield due to inhibited flowering and poor panicle numbers.”
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