Abstract
• New microvines combining Vitis vinifera and V. labrusca genetic backgrounds have be obtained. • The Vvgai1 mutation results in similar behaviours in V. labrusca than in V. vinifera . • The genetics of sex type and opposite-to-leaf trait are differentially governed. • Vvgai1 disturbs microvine C source/sink delaying shoot maturation but not reproductive development. In order to develop new genotypes to explore grapevine adaptation to climate, we introduced the Vvgai1 mutation in V. vinifera x V. labrusca hybrids. Vvgai1 mutation induced a strong miniaturisation of leaf and shoot length, as a result of a significant reduction of internodes size and an increase of the phyllochron. The lignification of the main shoots was delayed in the microvines in comparison to their macrovine counterparts while the leaf C assimilation rate was not impacted by the mutation. The shift from the alternate spiral (juvenile) to distichous (adult) phyllotaxis and the appearance of the first tendril occurred at lower node rank in macrovines. However, while macrovines did not produce any reproductive organs during the first vegetative cycle, microvines displayed the first perfect flowers on the main shoot from the internode 18, only a few months after embryo rescue and acclimation. The segregation of the sex type confirmed that the sex determining locus of the V. labrusca cv. Isabella is heterozygous. Conversely, the proportion of opposite-to-leaves organs following a labrusca - versus vinifera -type distribution suggested a more complex genetic determinism for this trait. These experiments provide a new set of microvine genotypes and phenotypic data for studying the response of V. labruscana to abiotic and biotic factors and open new questions about how phytohormones control the development of the grapevine liana.
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Claims 7
Claim · model-written summary
Vvgai1 reduced grapevine leaf and shoot length through smaller internodes and an increased phyllochron.
- Taxon
- Vitis labruscana
Vitis ×labruscanat0 - Treatment
- Vvgai1 mutatione0
- Gene
- Vvgai1e0
- Outcome
- leaf and shoot lengthe0
- Direction
- miniaturisatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vvgai1 mutation induced a strong miniaturisation of leaf and shoot length, as a result of a significant reduction of internodes size and an increase of the phyllochron.”
t0“Vitis labruscana microvines”
Claim · model-written summary
Microvine main shoot lignification was delayed relative to macrovines.
- Taxon
- Vitis labruscanaVitis ×labruscanat0
- Material
- microvinese0
- Outcome
- lignification of the main shootse0
- Direction
- delayede0
- Comparator
- macrovine counterpartse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lignification of the main shoots was delayed in the microvines in comparison to their macrovine counterparts”
t0“Vitis labruscana microvines”
Claim · model-written summary
The Vvgai1 mutation did not affect leaf carbon assimilation rate.
- Taxon
- Vitis labruscanaVitis ×labruscanat0
- Treatment
- Vvgai1 mutatione1
- Outcome
- leaf C assimilation ratee0
- Direction
- not impactede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the leaf C assimilation rate was not impacted by the mutation.”
e1“we introduced the Vvgai1 mutation in V. vinifera x V. labrusca hybrids.”
t0“Vitis labruscana microvines”
Claim · model-written summary
Macrovines reached adult phyllotaxis and first tendril at lower node rank than microvines.
- Taxon
- Vitis labruscanaVitis ×labruscanat0
- Material
- macrovinese0
- Outcome
- shift from the alternate spiral (juvenile) to distichous (adult) phyllotaxis and the appearance of the first tendrile0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The shift from the alternate spiral (juvenile) to distichous (adult) phyllotaxis and the appearance of the first tendril occurred at lower node rank in macrovines.”
t0“Vitis labruscana microvines”
Claim · model-written summary
Microvines produced first perfect flowers from internode 18 within months, while macrovines produced none in the first vegetative cycle.
- Taxon
- Vitis labruscanaVitis ×labruscanat0
- Material
- microvinese0
- Organ / stage
- main shoote0
- Outcome
- first perfect flowerse0
- Value
- internode 18e0
- Comparator
- macrovinese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while macrovines did not produce any reproductive organs during the first vegetative cycle, microvines displayed the first perfect flowers on the main shoot from the internode 18, only a few months after embryo rescue and acclimation.”
t0“Vitis labruscana microvines”
Claim · model-written summary
Sex type segregation confirmed heterozygosity at the sex determining locus of V. labrusca cv. Isabella.
- Taxon
- V. labruscaVitis labruscae0
- Material
- Isabellae0
- Gene
- sex determining locuse0
- Outcome
- heterozygouse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The segregation of the sex type confirmed that the sex determining locus of the V. labrusca cv. Isabella is heterozygous.”
t0“Vitis labruscana microvines”
Claim · model-written summary
Opposite-to-leaves organ proportions suggested complex genetic determination of that trait.
- Taxon
- Vitis labruscanaVitis ×labruscanat0
- Material
- labrusca - versus vinifera -type distributione0
- Outcome
- proportion of opposite-to-leaves organse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the proportion of opposite-to-leaves organs following a labrusca - versus vinifera -type distribution suggested a more complex genetic determinism for this trait.”
t0“Vitis labruscana microvines”