Abstract
Abstract To elucidate the deleterious effects of excessive lead (Pb) on rice (Oryza sativa) cv. Swarn Mansoori, plants were grown in refined sand in complete nutrient solution for 42 days. On the 43rd day, Pb nitrate was superimposed at 1 mM (to rice) for 104 days (till harvest). A set of plants in complete nutrient solution was maintained as control for the same period. Excess Pb reduced the dry weight pronouncedly at harvest (after 104 days of metal supply) when the grain yield also decreased. Lead accumulation reduced the concentrations of chlorophyll in leaves, carotene, sugars, phenols, nonprotein nitrogen, protein, iron, manganese, copper, zinc, Hill reaction activity, and peroxidase activity (one of the anti-oxidative enzymes), but increased the concentrations of sulphur, phosphorus, magnesium (early stage) protein nitrogen, and activity of catalase, acid phosphatase, and ribonuclease in leaves of rice. Except for slight growth depression and reduction in number and size of leaves, tillers and inflorescence, no other visible symptoms of excessive Pb could be seen before harvesting. Keywords: LeadPhytotoxicityEnzymes activitiesRice Acknowledgments The authors are grateful to Indian Council of Agricultural Research for financial help.
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Claims 10
Claim · model-written summary
Excess lead reduced rice dry weight and grain yield.
- Taxon
- rice
Oryza sativat0 - Treatment
- Excess Pbe0
- Outcome
- dry weighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excess Pb reduced the dry weight pronouncedly at harvest (after 104 days of metal supply) when the grain yield also decreased”
t0“rice”
Claim · model-written summary
Excess lead decreased rice grain yield.
- Taxon
- RiceOryza sativat0
- Treatment
- Leadt0
- Outcome
- grain yielde0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the grain yield also decreased”
t0“Lead Phytotoxicity on Growth, Yield, and Metabolism of Rice”
Claim · model-written summary
Lead accumulation reduced leaf chlorophyll, carotene and sugar concentrations.
- Taxon
- riceOryza sativat0
- Treatment
- Lead accumulatione0
- Outcome
- concentrations of chlorophyll in leaves, carotene, sugarse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lead accumulation reduced the concentrations of chlorophyll in leaves, carotene, sugars”
t0“Rice”
Claim · model-written summary
Lead accumulation reduced leaf phenols, nonprotein nitrogen and protein.
- Taxon
- RiceOryza sativat0
- Treatment
- Leadt0
- Outcome
- phenols, nonprotein nitrogen, proteine0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced the concentrations of chlorophyll in leaves, carotene, sugars, phenols, nonprotein nitrogen, protein”
t0“Lead Phytotoxicity on Growth, Yield, and Metabolism of Rice”
Claim · model-written summary
Lead accumulation reduced leaf iron, manganese and copper concentrations.
- Taxon
- RiceOryza sativat0
- Treatment
- Leadt0
- Outcome
- iron, manganese, coppere0
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“iron, manganese, copper, zinc, Hill reaction activity”
e1“Lead accumulation reduced the concentrations of chlorophyll in leaves, carotene, sugars, phenols, nonprotein nitrogen, protein, iron, manganese, copper, zinc, Hill reaction activity, and peroxidase activity”
t0“Lead Phytotoxicity on Growth, Yield, and Metabolism of Rice”
Claim · model-written summary
Lead accumulation reduced leaf zinc, Hill reaction and peroxidase activity.
- Taxon
- RiceOryza sativat0
- Treatment
- Leadt0
- Outcome
- zinc, Hill reaction activity, and peroxidase activitye0
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“zinc, Hill reaction activity, and peroxidase activity”
e1“Lead accumulation reduced the concentrations of chlorophyll in leaves, carotene, sugars, phenols, nonprotein nitrogen, protein, iron, manganese, copper, zinc, Hill reaction activity, and peroxidase activity”
t0“Lead Phytotoxicity on Growth, Yield, and Metabolism of Rice”
Claim · model-written summary
Lead increased leaf sulphur, phosphorus and magnesium concentrations.
- Taxon
- RiceOryza sativat0
- Treatment
- Leadt0
- Outcome
- concentrations of sulphur, phosphorus, magnesiume0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the concentrations of sulphur, phosphorus, magnesium (early stage)”
t0“Lead Phytotoxicity on Growth, Yield, and Metabolism of Rice”
Claim · model-written summary
Lead increased leaf protein nitrogen, catalase and acid phosphatase activity.
- Taxon
- riceOryza sativae0
- Treatment
- Leadt0
- Outcome
- protein nitrogen, and activity of catalase, acid phosphatasee0
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“protein nitrogen, and activity of catalase, acid phosphatase, and ribonuclease in leaves of rice”
e1“increased the concentrations of sulphur, phosphorus, magnesium (early stage) protein nitrogen, and activity of catalase, acid phosphatase, and ribonuclease in leaves of rice”
t0“Lead Phytotoxicity on Growth, Yield, and Metabolism of Rice”
Claim · model-written summary
Lead increased leaf ribonuclease activity.
- Taxon
- riceOryza sativae0
- Treatment
- Leadt0
- Outcome
- ribonucleasee0
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ribonuclease in leaves of rice”
e1“increased the concentrations of sulphur, phosphorus, magnesium (early stage) protein nitrogen, and activity of catalase, acid phosphatase, and ribonuclease in leaves of rice”
t0“Lead Phytotoxicity on Growth, Yield, and Metabolism of Rice”
Claim · model-written summary
Lead slightly depressed growth and reduced leaf, tiller and inflorescence number and size.
- Taxon
- RiceOryza sativat0
- Treatment
- Leadt0
- Outcome
- number and size of leaves, tillers and inflorescencee0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“slight growth depression and reduction in number and size of leaves, tillers and inflorescence”
t0“Lead Phytotoxicity on Growth, Yield, and Metabolism of Rice”
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See all 9 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.