Abstract
The response of two varieties of rice plant (BR-28 and BR-29) to arsenic accumulation added from two sources (As III and As V ) under two different water regimes (100 and 75% of field capacity) were examined. Treatments added to soil were 0, 10, 20 and 40 mg As/kg soil. Plant samples were collected after 120 and 140 days from seed sowing, for BR-28 and BR-29 respectively. Delayed seedling emergence; reduced plant growth; yellowing and wilting of leaves; brown necrotic spots on old leaves; and, finally, reduced grain yield of the two varieties, confirmed the symptoms of As toxicity. Arsenic accumulation by plants growing with either As III or As V increased with increasing As treatment, irrespective of water regimes. However, the accumulation was greater in the arsenite-treated soil than that in the arsenate-treated one, indicating the higher phytoavailability of As III . Most of the As taken up by plants was sequestered in the root, followed by straw and grain. In roots of BR-28, the maximum As accumulation from arsenite-treated soil was 17.6 mg/kg dry weight (d.w.) at 100% field capacity (f.c.), whereas at 75% f.c. it was 15.4 mg/kg d.w. and for the roots of BR-29 the values were 31.04 mg/kg d.w and 22.65 mg/kg d.w. at 100 and 75% of f.c. respectively. Arsenic in straw and grain was lower for plants of both varieties at 75% of f.c. However, there have been some varietal differences in the response to As III or As V . The paper discusses the possible management of moisture regimes to reduce the phytoavailability of arsenic, thereby mitigating its toxicity in the rice crop.
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Claims 11
Claim · model-written summary
Arsenic toxicity delayed rice seedling emergence and reduced growth and grain yield.
- Taxon
- rice
Oryza sativat0 - Treatment
- As toxicitye0
- Outcome
- plant growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Delayed seedling emergence; reduced plant growth; yellowing and wilting of leaves; brown necrotic spots on old leaves; and, finally, reduced grain yield of the two varieties, confirmed the symptoms of As toxicity”
Claim · model-written summary
Arsenic toxicity caused leaf yellowing, wilting and necrotic spots.
- Taxon
- riceOryza sativat0
- Outcome
- yellowing and wilting of leaves; brown necrotic spots on old leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“yellowing and wilting of leaves; brown necrotic spots on old leaves”
Claim · model-written summary
Plant arsenic accumulation increased with arsenic treatment dose under either water regime.
- Taxon
- riceOryza sativat0
- Treatment
- increasing As treatmente0
- Outcome
- Arsenic accumulatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Arsenic accumulation by plants growing with either As III or As V increased with increasing As treatment, irrespective of water regimes”
Claim · model-written summary
Arsenite-treated soil produced greater rice arsenic accumulation than arsenate-treated soil.
- Taxon
- riceOryza sativat0
- Treatment
- arsenite-treated soile0
- Outcome
- accumulatione0
- Direction
- greatere0
- Comparator
- arsenate-treated onee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“the accumulation was greater in the arsenite-treated soil than that in the arsenate-treated one”
Claim · model-written summary
Most taken-up arsenic was retained in roots, followed by straw and grain.
- Taxon
- riceOryza sativat0
- Organ / stage
- roote0
- Outcome
- As taken up by plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Most of the As taken up by plants was sequestered in the root, followed by straw and grain”
Claim · model-written summary
BR-28 root arsenic accumulation reached 17.6 mg/kg dry weight at 100% field capacity.
- Taxon
- riceOryza sativat0
- Material
- BR-28e0
- Organ / stage
- rootse0
- Treatment
- arsenite-treated soile0
- Outcome
- As accumulatione0
- Direction
- maximume0
- Value
- 17.6 mg/kg dry weighte0
- Qualifier
- 100% field capacitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“In roots of BR-28, the maximum As accumulation from arsenite-treated soil was 17.6 mg/kg dry weight (d.w.) at 100% field capacity (f.c.)”
Claim · model-written summary
BR-28 root arsenic was 15.4 mg/kg dry weight at 75% field capacity.
- Taxon
- riceOryza sativat0
- Material
- BR-28e1
- Outcome
- As accumulatione1
- Value
- 15.4 mg/kg d.w.e0
- Qualifier
- 75% f.c.e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“at 75% f.c. it was 15.4 mg/kg d.w.”
e1“In roots of BR-28, the maximum As accumulation from arsenite-treated soil was 17.6 mg/kg dry weight (d.w.) at 100% field capacity (f.c.)”
Claim · model-written summary
BR-29 root arsenic was 31.04 mg/kg dry weight at 100% field capacity.
- Taxon
- riceOryza sativat0
- Material
- BR-29e0
- Outcome
- rootse0
- Value
- 31.04 mg/kg d.we0
- Qualifier
- 100 and 75% of f.c.e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“for the roots of BR-29 the values were 31.04 mg/kg d.w and 22.65 mg/kg d.w. at 100 and 75% of f.c. respectively”
Claim · model-written summary
BR-29 root arsenic was 22.65 mg/kg dry weight at 75% field capacity.
- Taxon
- riceOryza sativat0
- Material
- BR-29e0
- Outcome
- rootse0
- Value
- 22.65 mg/kg d.w.e0
- Qualifier
- 100 and 75% of f.c.e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“for the roots of BR-29 the values were 31.04 mg/kg d.w and 22.65 mg/kg d.w. at 100 and 75% of f.c. respectively”
Claim · model-written summary
Rice straw and grain arsenic was lower at 75% field capacity.
- Taxon
- riceOryza sativat0
- Treatment
- 75% of f.c.e0
- Outcome
- Arsenic in straw and graine0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Arsenic in straw and grain was lower for plants of both varieties at 75% of f.c.”
Claim · model-written summary
Varieties differed in response to arsenite and arsenate.
- Taxon
- riceOryza sativat0
- Outcome
- varietal differences in the response to As III or As Ve0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“there have been some varietal differences in the response to As III or As V”
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