Abstract
BACKGROUND: Grain quality is an important index of rice production, particularly when plants are grown under stress. Arsenic (As) contamination in paddy fields severely affects rice grain yield and quality. Here, the effects of As and combinations of As(III)-oxidizing bacteria (Pseudomonas stutzeri 4.25, 4.27, and 4.44) and plant growth-promoting bacteria (Delftia acidovorans KKU2500-12 and Cupriavidus taiwanensis KKU2500-3) on enzymes related to starch accumulation in grains and the grain quality of Khao Dawk Mali 105 rice cultivated in As-contaminated soil under greenhouse conditions were investigated. RESULTS: Arsenic affected the activities of starch biosynthesis-related enzymes, and decreases of up to 76.27%, 71.53%, 49.74%, 73.39%, and 47.46% in AGPase, SSS, GBSS, SBE, and SDBE activities, respectively, and 9.42-61.07% in starch accumulation in grains were detected after growth in As-contaminated soil. However, the KKU2500-3/4.25 and KKU2500-3/4.44 combinations yielded the greatest enzyme activities in grains, and compared with the results observed in uninoculated seedlings, increases in starch accumulation of up to 51.16% and 23.81% were found in the inoculated seedlings after growth in medium- and high-As-contaminated soils, at 10-17 and 10-24 days after anthesis, respectively. The bacteria increased the 2-AP content in rice under As stress, possibly via the induction of proline, a 2-AP substrate. Bacterium-inoculated rice had significantly greater 2-AP levels than uninoculated rice, and 2.16-9.93% and 26.57-42.04% increases were detected in rice plants grown in medium- and high-As-contaminated soils, respectively. CONCLUSIONS: Arsenic toxicity can be mitigated in rice growing under greenhouse conditions by maintaining starch biosynthesis, accumulating amylose, and increasing 2-AP content. The effectiveness of these bacteria should be validated in paddy fields; hence, safe rice grains with a good starch content and aroma could be produced.
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Claims 13
Claim · model-written summary
Arsenic-contaminated soil reduced rice grain AGPase activity by up to 76.27%.
- Taxon
- rice
Oryza sativat0 - Treatment
- As-contaminated soile0
- Outcome
- AGPasee0
- Direction
- decreasese0
- Value
- 76.27%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases of up to 76.27%, 71.53%, 49.74%, 73.39%, and 47.46% in AGPase, SSS, GBSS, SBE, and SDBE activities, respectively, and 9.42-61.07% in starch accumulation in grains were detected after growth in As-contaminated soil”
t0“rice plants”
Claim · model-written summary
Arsenic-contaminated soil reduced rice grain SSS activity by up to 71.53%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases of up to 76.27%, 71.53%, 49.74%, 73.39%, and 47.46% in AGPase, SSS, GBSS, SBE, and SDBE activities, respectively, and 9.42-61.07% in starch accumulation in grains were detected after growth in As-contaminated soil”
t0“rice plants”
Claim · model-written summary
Arsenic-contaminated soil reduced rice grain GBSS activity by up to 49.74%.
- Taxon
- riceOryza sativat0
- Treatment
- As-contaminated soile0
- Outcome
- GBSSe0
- Direction
- decreasese0
- Value
- 49.74%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases of up to 76.27%, 71.53%, 49.74%, 73.39%, and 47.46% in AGPase, SSS, GBSS, SBE, and SDBE activities, respectively, and 9.42-61.07% in starch accumulation in grains were detected after growth in As-contaminated soil”
t0“rice plants”
Claim · model-written summary
Arsenic-contaminated soil reduced rice grain SBE activity by up to 73.39%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases of up to 76.27%, 71.53%, 49.74%, 73.39%, and 47.46% in AGPase, SSS, GBSS, SBE, and SDBE activities, respectively, and 9.42-61.07% in starch accumulation in grains were detected after growth in As-contaminated soil”
t0“rice plants”
Claim · model-written summary
Arsenic-contaminated soil reduced rice grain SDBE activity by up to 47.46%.
- Taxon
- riceOryza sativat0
- Treatment
- As-contaminated soile0
- Outcome
- SDBEe0
- Direction
- decreasese0
- Value
- 47.46%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreases of up to 76.27%, 71.53%, 49.74%, 73.39%, and 47.46% in AGPase, SSS, GBSS, SBE, and SDBE activities, respectively, and 9.42-61.07% in starch accumulation in grains were detected after growth in As-contaminated soil”
t0“rice plants”
Claim · model-written summary
Arsenic-contaminated soil reduced rice grain starch accumulation by 9.42–61.07%.
- Taxon
- riceOryza sativat0
- Treatment
- As-contaminated soile0
- Outcome
- starch accumulation in grainse0
- Direction
- decreasee1
- Value
- 9.42-61.07%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“9.42-61.07% in starch accumulation in grains were detected after growth in As-contaminated soil”
t0“rice plants”
e1“decreases of up to 76.27%”
Claim · model-written summary
KKU2500-3/4.25 inoculation gave the greatest rice grain enzyme activities.
- Taxon
- riceOryza sativat0
- Treatment
- KKU2500-3/4.25e0
- Outcome
- enzyme activities in grainse0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the KKU2500-3/4.25 and KKU2500-3/4.44 combinations yielded the greatest enzyme activities in grains”
t0“rice plants”
Claim · model-written summary
KKU2500-3/4.44 inoculation gave the greatest rice grain enzyme activities.
- Taxon
- riceOryza sativat0
- Treatment
- KKU2500-3/4.44e0
- Outcome
- enzyme activities in grainse0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the KKU2500-3/4.25 and KKU2500-3/4.44 combinations yielded the greatest enzyme activities in grains”
t0“rice plants”
Claim · model-written summary
Bacterial inoculation increased rice grain starch accumulation by up to 51.16% in medium-arsenic soil.
- Taxon
- riceOryza sativat0
- Treatment
- inoculated seedlingse0
- Outcome
- starch accumulatione0
- Direction
- increasese0
- Value
- 51.16%e0
- Qualifier
- medium-e0
- Comparator
- uninoculated seedlingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in starch accumulation of up to 51.16% and 23.81% were found in the inoculated seedlings after growth in medium- and high-As-contaminated soils, at 10-17 and 10-24 days after anthesis, respectively”
t0“rice plants”
e1“uninoculated seedlings”
Claim · model-written summary
Bacterial inoculation increased rice grain starch accumulation by up to 23.81% in high-arsenic soil.
- Taxon
- riceOryza sativat0
- Treatment
- inoculated seedlingse0
- Outcome
- starch accumulatione0
- Direction
- increasese0
- Value
- 23.81%e0
- Qualifier
- high-As-contaminated soilse0
- Comparator
- uninoculated seedlingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in starch accumulation of up to 51.16% and 23.81% were found in the inoculated seedlings after growth in medium- and high-As-contaminated soils, at 10-17 and 10-24 days after anthesis, respectively”
t0“rice plants”
e1“uninoculated seedlings”
Claim · model-written summary
Bacterial inoculation significantly increased rice 2-AP in medium-arsenic soil by 2.16–9.93%.
- Taxon
- riceOryza sativae0
- Treatment
- Bacterium-inoculatede0
- Outcome
- 2-AP levelse0
- Direction
- greatere0
- Value
- 2.16-9.93%e0
- Comparator
- uninoculated ricee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bacterium-inoculated rice had significantly greater 2-AP levels than uninoculated rice, and 2.16-9.93% and 26.57-42.04% increases were detected in rice plants grown in medium- and high-As-contaminated soils, respectively”
Claim · model-written summary
Bacterial inoculation significantly increased rice 2-AP in high-arsenic soil by 26.57–42.04%.
- Taxon
- riceOryza sativae0
- Treatment
- Bacterium-inoculatede0
- Outcome
- 2-AP levelse0
- Direction
- greatere0
- Value
- 26.57-42.04%e0
- Comparator
- uninoculated ricee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bacterium-inoculated rice had significantly greater 2-AP levels than uninoculated rice, and 2.16-9.93% and 26.57-42.04% increases were detected in rice plants grown in medium- and high-As-contaminated soils, respectively”
Claim · model-written summary
The authors propose that bacterial induction of proline may increase rice 2-AP.
- Taxon
- riceOryza sativae0
- Compound
- prolinee0
- Outcome
- 2-AP contente0
- Qualifier
- possiblye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The bacteria increased the 2-AP content in rice under As stress, possibly via the induction of proline, a 2-AP substrate”
The same questions in other papers
inoculation · quality: sugar starch · Oryza sativa (rice)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
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See all 8 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.