Abstract
Climate change is a major concern in grape production worldwide. Nights have been warming much faster than the days, raising attention on the effect of night temperatures on grape and wine composition. In this study we evaluated the effect of night temperatures on grape coloration in the cv. Corvina (Vitis vinifera L.). In 2015 and 2016 potted plants were cooled overnight (10-11 °C) during two berry ripening phases, veraison (TV) or post-veraison (TPV), and compared to control vines (C) grown at ambient night temperature (15-20 °C on average). Cooling treatment around veraison (TV) hastened berry anthocyanin accumulation, while the same treatment applied after veraison (TPV) was ineffective. Molecular analysis revealed an increased transcription of four key genes in anthocyanin biosynthesis (CHS3, F3H1, MYBA1 and UFGT) in TV treatment. These results suggest that the anthocyanin biosynthesis capacity was enhanced by cool nights during veraison. However, since the gene expression was not always temporally correlated to the increase in anthocyanin concentration, we speculate on the presence of mechanisms, such as enzymatic regulation or anthocyanin transport, which may contribute in determining the anthocyanin accumulation under low night temperatures.
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Claims 4
Claim · model-written summary
Night cooling at veraison hastened berry anthocyanin accumulation versus ambient night temperature.
Verbatim
e0“Cooling treatment around veraison (TV) hastened berry anthocyanin accumulation”
e1“compared to control vines (C) grown at ambient night temperature (15-20 °C on average)”
t0“Corvina grapes (Vitis Vinifera L.)”
Claim · model-written summary
Night cooling after veraison was ineffective for berry anthocyanin accumulation.
Verbatim
e0“the same treatment applied after veraison (TPV) was ineffective”
e1“Cooling treatment around veraison (TV) hastened berry anthocyanin accumulation”
e2“compared to control vines (C) grown at ambient night temperature (15-20 °C on average)”
t0“Corvina grapes (Vitis Vinifera L.)”
Claim · model-written summary
Veraison cooling increased transcription of CHS3, F3H1, and MYBA1.
Verbatim
e0“increased transcription of four key genes in anthocyanin biosynthesis (CHS3, F3H1, MYBA1 and UFGT) in TV treatment”
e1“compared to control vines (C) grown at ambient night temperature (15-20 °C on average)”
t0“Corvina grapes (Vitis Vinifera L.)”
Claim · model-written summary
Gene transcription was not always temporally correlated with anthocyanin concentration increase.
- Taxon
- Corvina grapes (Vitis Vinifera L.)t0
- Gene
- gene expressione0
- Outcome
- anthocyanin concentratione0
- Qualifier
- not always temporally correlatede0
Not reportedDirection
Verbatim
e0“gene expression was not always temporally correlated to the increase in anthocyanin concentration”
t0“Corvina grapes (Vitis Vinifera L.)”
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