Carbon partitioning to berries in water stressed grapevines: The role of active transport in leaves and fruits
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2014Metadata
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Pastenes Villarreal, Claudio
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Carbon partitioning to berries in water stressed grapevines: The role of active transport in leaves and fruits
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Abstract
Although imposed water stress is a common agricultural practice worldwide, the physiological and
molecular responses of grapevine leaves and fruits, and their interactions, in relation to carbon
partitioning remain unknown. We have assessed, in
field grown grapevines, the effect of four deficit
irrigation regimes, from veraison through to the end of the season, on daily and seasonal non-structural
carbon stocks and assimilation in leaves and sugar content in berries, along with the transcript profile for
sugar transport proteins in leaves and berries. Average midday xylem water potentials along the season
ranged from mild to severe water stress, i.e.,
0.7 MPa to
1.05 MPa, respectively. In all the treatments,
berries reached equal sugar concentration 20–35 days after veraison because of a proportional effect on
berry volume and sugar content per berry. In berries, mild water stress accelerated the sugar
accumulation increasing the abundance of VvSUC27, VvHT3 and VvHT5, only strictly around veraison.
Transcripts abundance in berries did not match sugar uptake rate since, VvSUC11, VvSUC12, VvHT5, as well
as the cell wall invertase VvCWI, kept rising after berries were
filled. In leaves, when berries reached
maximal sugar content, export was transiently reduced resulting in starch accumulation. Water stress
increased the gene expression for sucrose transporters known to code for mesophyll cell proteins in
leaves, without affecting the transcript abundance for the phloem loading protein. The latter suggests
that mild water stress triggers active sugar transport in the source tissues as a means for supporting the
sugar accumulation in berries under depressed carbon assimilation by leaves.
General note
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This work was supported through funding from the CONICYT,
Fondecyt Fund (grant no. 1110193). The authors thank Haras de
Pirque Vineyards for their collaboration with the plant material
and
field support.
Identifier
URI: https://repositorio.uchile.cl/handle/2250/120250
DOI: DOI: 10.1016/j.envexpbot.2014.06.009
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Environmental and Experimental Botany 107 (2014) 154–166
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