Abstract
BACKGROUND: Parthenocarpy, or fruit development in the absence of fertilization, has been genetically engineered in eggplant and in other horticultural species by using the DefH9-iaaM gene. The iaaM gene codes for tryptophan monoxygenase and confers auxin synthesis, while the DefH9 controlling regions drive expression of the gene specifically in the ovules and placenta. A previous greenhouse trial for winter production of genetically engineered (GM) parthenocarpic eggplants demonstrated a significant increase (an average of 33% increase) in fruit production concomitant with a reduction in cultivation costs. RESULTS: GM parthenocarpic eggplants have been evaluated in three field trials. Two greenhouse spring trials have shown that these plants outyielded the corresponding untransformed genotypes, while a summer trial has shown that improved fruit productivity in GM eggplants can also be achieved in open field cultivation. Since the fruits were always seedless, the quality of GM eggplant fruits was improved as well. RT-PCR analysis demonstrated that the DefH9-iaaM gene is expressed during late stages of fruit development. CONCLUSIONS: The DefH9-iaaM parthenocarpic gene is a biotechnological tool that enhances the agronomic value of all eggplant genotypes tested. The main advantages of DefH9-iaaM eggplants are: i) improved fruit productivity (at least 30-35%) under both greenhouse and open field cultivation; ii) production of good quality (marketable) fruits during different types of cultivation; iii) seedless fruit with improved quality. Such advantages have been achieved without the use of either male or female sterility genes.
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Claims 5
Claim · model-written summary
GM eggplants outyielded untransformed genotypes in spring greenhouse trials.
- Taxon
- eggplants
Solanum melongenat0 - Treatment
- Genetically modified parthenocarpic eggplantst0
- Outcome
- outyieldede0
- Direction
- outyieldede0
- Comparator
- untransformed genotypese0
- Setting
- greenhouse spring trialse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two greenhouse spring trials have shown that these plants outyielded the corresponding untransformed genotypes”
t0“Genetically modified parthenocarpic eggplants”
Claim · model-written summary
GM eggplants had improved productivity in open field cultivation.
- Taxon
- eggplantsSolanum melongenae0
- Treatment
- GM eggplantse0
- Outcome
- fruit productivitye0
- Direction
- improvede0
- Setting
- open field cultivatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a summer trial has shown that improved fruit productivity in GM eggplants can also be achieved in open field cultivation”
Claim · model-written summary
GM eggplant fruits were seedless and had improved quality.
- Taxon
- eggplantSolanum melongenae0
- Outcome
- fruits were always seedlesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Since the fruits were always seedless, the quality of GM eggplant fruits was improved as well”
Claim · model-written summary
The DefH9-iaaM gene was expressed in late fruit development.
- Taxon
- eggplantsSolanum melongenat0
- Organ / stage
- late stages of fruit developmente0
- Gene
- DefH9-iaaMe0
- Outcome
- gene is expressede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RT-PCR analysis demonstrated that the DefH9-iaaM gene is expressed during late stages of fruit development”
t0“Genetically modified parthenocarpic eggplants”
Claim · model-written summary
DefH9-iaaM eggplants improved fruit productivity by at least 30-35%.
- Taxon
- eggplantsSolanum melongenat0
- Treatment
- Genetically modified parthenocarpic eggplantst0
- Outcome
- fruit productivitye0
- Direction
- improvede0
- Value
- at least 30-35%e0
- Setting
- greenhouse and open field cultivatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“improved fruit productivity (at least 30-35%) under both greenhouse and open field cultivation”
t0“Genetically modified parthenocarpic eggplants”
The same questions in other papers
transgenic · yield · Solanum melongena (eggplant)Results agree
6 papers in the same direction as this paper
- positive
- positive
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See all 7 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.