Abstract
As a key component of ecological risk assessments, nontarget effects of Bacillus thuringiensis (Bt) rice have been tested under laboratory and field conditions for various organisms. A 2-yr field experiment was conducted to observe the nontarget effects of six transgenic rice lines (expressing the Cry1Ab or fused protein of Cry1Ab and Cry1Ac) on four nontarget thrips species including Frankliniella intonsa (Trybom), F. tenuicornis (Uzel), Haplothrips aculeatus (F.), and H. tritici (Kurd), as compared with their rice parental control lines. Two sampling methods including the beat plate and plastic bag method were used to monitor the population densities of the four thrips species for 2 yr. The results showed that the seasonal average densities of four tested thrips species in Bt rice plots were significantly lower than or very similar to those in the non-Bt rice plots depending on rice genotypes, sampling methods, and years. Among all six tested Bt rice lines, transgenic B1 and KMD2 lines suppressed the population of these tested thrips species the most. Our results indicate that the tested Bt rice lines are unlikely to result in high population pressure of thrips species in comparison with non-Bt rice. In some cases, Bt rice lines could significantly suppress thrips populations in the rice ecosystem. In addition, compatibility of Bt rice, with rice host plant resistance to nontarget sucking pests is also discussed within an overall integrated pest management program for rice.
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Claims 4
Claim · model-written summary
Bt rice plots had thrips densities that were significantly lower than or very similar to non-Bt rice plots, depending on genotype, sampling method and year.
- Taxon
- rice
Oryza sativae1 - Treatment
- transgenic rice linese1
- Outcome
- seasonal average densitiese2
- Direction
- significantly lower than or very similar toe2
- Qualifier
- depending on rice genotypes, sampling methods, and yearse2
- Comparator
- non-Bt rice plotse2
ThripsOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“six transgenic rice lines (expressing the Cry1Ab or fused protein of Cry1Ab and Cry1Ac) on four nontarget thrips species including Frankliniella intonsa (Trybom)”
e2“the seasonal average densities of four tested thrips species in Bt rice plots were significantly lower than or very similar to those in the non-Bt rice plots depending on rice genotypes, sampling methods, and years”
Claim · model-written summary
Among six Bt rice lines, transgenic B1 and KMD2 lines suppressed thrips populations the most.
- Taxon
- riceOryza sativae3
- Treatment
- transgenic B1 and KMD2 linese3
- Outcome
- populatione3
- Direction
- suppressede3
- Comparator
- all six tested Bt rice linese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Among all six tested Bt rice lines, transgenic B1 and KMD2 lines suppressed the population of these tested thrips species the most”
Claim · model-written summary
Tested Bt rice lines are unlikely to result in high thrips population pressure compared with non-Bt rice.
- Taxon
- riceOryza sativae4
- Treatment
- tested Bt rice linese4
- Outcome
- population pressure of thrips speciese4
- Comparator
- non-Bt ricee4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Our results indicate that the tested Bt rice lines are unlikely to result in high population pressure of thrips species in comparison with non-Bt rice”
Claim · model-written summary
In some cases Bt rice lines significantly suppressed thrips populations in the rice ecosystem.
- Taxon
- riceOryza sativae5
- Treatment
- Bt rice linese5
- Outcome
- thrips populationse5
- Direction
- significantly suppresse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“In some cases, Bt rice lines could significantly suppress thrips populations in the rice ecosystem”
The same questions in other papers
transgenic · pest · Oryza sativa (rice)Positive and negative results
9 papers in the same direction as this paper · 4 in the opposite direction · 3 reporting no difference from an alternative
- no effect
- negative
- negative
13 papers more in this group
See all 17 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.