Abstract
Aims: Arsenic (As) contamination in rice is at alarming level as majority of rice growing regions in India are As contaminated. Present investigation is designed to study the better understanding of the physiological and biochemical mechanisms in the amount of chlorophyll change and antioxidative enzymes activity under arsenic stress on rice variety IET-4786 (Shatabdi). Study Design: Completely Randomized Design. Place and Duration of Study: The experiment was carried out in the departmental laboratory of Plant Physiology, Bidhan Chandra Krishi Viswavidyalaya (BCKV), Mohanpur, Nadia,West Bengal during the year 2017-18. Methodology: Two classes of inorganic arsenic- As(V) in the form of Sodium arsenate (Na2HAsO4.7H2O, M. W. = 321.01) and As(III) in the form of Sodium arsenite (NaAsO2, M.W. =129.91) were added to the modified Hoagland nutrient solution@ 2.5, 5.0, 7.5, 10.0, 12.5,15.0 mg L-1concentration. After 20 days of treatment, rice seedlings under arsenate/arsenite treatments were analyzed for change in total chlorophyll content and antioxidative enzymes activity such as superoxide dismutase (SOD: EC 1.15.1.1), catalase (CAT: EC 1.11.1.6), ascorbate peroxidase (APX: EC1.11.1.11) and peroxidase (POD: EC 1.11.1.7). Results: A noticeable decrease in total chlorophyll content was observed with arsenic treatments as compared to control. Various antioxidative enzymes showed significant variable response upon exposure to As(III) and As(V). SOD activities increased at low arsenic exposure up to 7.5 mg L-1 but decreased with further increase in arsenic treatments. APX and POD activities were increased with increase in arsenic concentrations while CAT activity displayed decreasing trend. Conclusion: The results are suggestive of differential metabolism of As(III) and As(V) in rice and could exert harmfulness in the early development stage of rice at inappropriate concentrations.
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Claims 6
Claim · model-written summary
Arsenic treatments decreased total chlorophyll content relative to control.
- Taxon
- rice seedlings
Oryza sativat0 - Treatment
- arsenic treatmentse0
- Outcome
- total chlorophyll contente0
- Direction
- decreasee0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A noticeable decrease in total chlorophyll content was observed with arsenic treatments as compared to control”
t0“Rice Seedlings”
Claim · model-written summary
Antioxidative enzymes responded variably and significantly to As(III) and As(V).
- Taxon
- Rice SeedlingsOryza sativat0
- Treatment
- As(III) and As(V)e0
- Outcome
- antioxidative enzymese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Various antioxidative enzymes showed significant variable response upon exposure to As(III) and As(V)”
t0“Rice Seedlings”
Claim · model-written summary
SOD activity increased at arsenic exposure up to 7.5 mg L-1.
- Taxon
- Rice SeedlingsOryza sativat0
- Treatment
- low arsenic exposure up to 7.5 mg L-1e0
- Gene
- SODe0
- Outcome
- SOD activitiese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SOD activities increased at low arsenic exposure up to 7.5 mg L-1”
t0“Rice Seedlings”
Claim · model-written summary
SOD activity decreased with further increase in arsenic treatment.
- Taxon
- Rice SeedlingsOryza sativat0
- Treatment
- further increase in arsenic treatmentse0
- Gene
- SODe1
- Outcome
- SOD activitiese1
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but decreased with further increase in arsenic treatments”
e1“SOD activities increased at low arsenic exposure up to 7.5 mg L-1”
t0“Rice Seedlings”
Claim · model-written summary
APX and POD activities increased with increasing arsenic concentration.
- Taxon
- Rice SeedlingsOryza sativat0
- Treatment
- increase in arsenic concentrationse0
- Gene
- APX and PODe0
- Outcome
- APX and POD activitiese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“APX and POD activities were increased with increase in arsenic concentrations”
t0“Rice Seedlings”
Claim · model-written summary
CAT activity decreased as arsenic concentration increased.
- Taxon
- Rice SeedlingsOryza sativat0
- Treatment
- arsenice1
- Gene
- CATe0
- Outcome
- CAT activitye0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while CAT activity displayed decreasing trend”
e1“SOD activities increased at low arsenic exposure up to 7.5 mg L-1”
t0“Rice Seedlings”
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