Soil temperature moderates grapevine carbohydrate reserves after bud-break and conditions fruit set responses to photoassimilatory stress

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Abstract

In cultivated grapevines (Vitis vinifera L.), sub-optimal photoassimilatory conditions during flowering can lead to inflorescence necrosis and shedding of flowers and young ovaries and consequently, poor fruit set. However before this study it was not known if carbohydrate reserves augment fruit set when concurrent photoassimilation is limited. Carbohydrate reserves are most abundant in grapevine roots and soil temperature moderates their mobilisation. Accordingly, we grew potted Chardonnay grapevines in soil at 15°C (cool) or 26°C (warm) from bud-break to the onset of flowering to manipulate root carbohydrate reserve status. Then to induce photoassimilatory responses we subjected the plants to low (94 µmol mol-1) CO2 or ambient (336 µmol mol-1) CO2 atmospheres during fruit setting. Analyses of photoassimilation, and biomass and carbohydrate reserve distribution confirmed that fruit set was limited by concurrent photoassimilation. Furthermore, the availability of current photoassimilates for inflorescence development and fruit set was conditioned by the simultaneous demands for shoot and root growth, as well as the restoration of root carbohydrate reserves. The study indicates that great seasonal variability in grapevine fruit set is a likely response of cultivated grapevines to photoassimilatory stresses, such as shading, defoliation and air temperature, and to variations in carbohydrate reserve status prior to flowering.
Original languageEnglish
Pages (from-to)899-909
Number of pages11
JournalFunctional Plant Biology
Volume38
Issue number11
DOIs
Publication statusPublished - Sep 2011

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budbreak
fruit set
soil temperature
Fruit
stress response
Soil
Carbohydrates
carbohydrates
Temperature
flowering
Inflorescence
Vitis
Atmosphere
defoliation
Vitis vinifera
Biomass
Ovary
root growth
shade
air temperature

Cite this

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title = "Soil temperature moderates grapevine carbohydrate reserves after bud-break and conditions fruit set responses to photoassimilatory stress",
abstract = "In cultivated grapevines (Vitis vinifera L.), sub-optimal photoassimilatory conditions during flowering can lead to inflorescence necrosis and shedding of flowers and young ovaries and consequently, poor fruit set. However before this study it was not known if carbohydrate reserves augment fruit set when concurrent photoassimilation is limited. Carbohydrate reserves are most abundant in grapevine roots and soil temperature moderates their mobilisation. Accordingly, we grew potted Chardonnay grapevines in soil at 15°C (cool) or 26°C (warm) from bud-break to the onset of flowering to manipulate root carbohydrate reserve status. Then to induce photoassimilatory responses we subjected the plants to low (94 {\^A}µmol mol-1) CO2 or ambient (336 {\^A}µmol mol-1) CO2 atmospheres during fruit setting. Analyses of photoassimilation, and biomass and carbohydrate reserve distribution confirmed that fruit set was limited by concurrent photoassimilation. Furthermore, the availability of current photoassimilates for inflorescence development and fruit set was conditioned by the simultaneous demands for shoot and root growth, as well as the restoration of root carbohydrate reserves. The study indicates that great seasonal variability in grapevine fruit set is a likely response of cultivated grapevines to photoassimilatory stresses, such as shading, defoliation and air temperature, and to variations in carbohydrate reserve status prior to flowering.",
keywords = "Open access version available, Biomass partitioning, Carbohydrates, Carbon dioxide, Flowering, Grapevine, Root growth, Soil temperature",
author = "Suzy Rogiers and Jason Smith and Bruno Holzapfel and William Hardie",
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AU - Rogiers, Suzy

AU - Smith, Jason

AU - Holzapfel, Bruno

AU - Hardie, William

N1 - Imported on 12 Apr 2017 - DigiTool details were: month (773h) = September, 2011; Journal title (773t) = Functional Plant Biology: an international journal of plant function. ISSNs: 1445-4408;

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N2 - In cultivated grapevines (Vitis vinifera L.), sub-optimal photoassimilatory conditions during flowering can lead to inflorescence necrosis and shedding of flowers and young ovaries and consequently, poor fruit set. However before this study it was not known if carbohydrate reserves augment fruit set when concurrent photoassimilation is limited. Carbohydrate reserves are most abundant in grapevine roots and soil temperature moderates their mobilisation. Accordingly, we grew potted Chardonnay grapevines in soil at 15°C (cool) or 26°C (warm) from bud-break to the onset of flowering to manipulate root carbohydrate reserve status. Then to induce photoassimilatory responses we subjected the plants to low (94 µmol mol-1) CO2 or ambient (336 µmol mol-1) CO2 atmospheres during fruit setting. Analyses of photoassimilation, and biomass and carbohydrate reserve distribution confirmed that fruit set was limited by concurrent photoassimilation. Furthermore, the availability of current photoassimilates for inflorescence development and fruit set was conditioned by the simultaneous demands for shoot and root growth, as well as the restoration of root carbohydrate reserves. The study indicates that great seasonal variability in grapevine fruit set is a likely response of cultivated grapevines to photoassimilatory stresses, such as shading, defoliation and air temperature, and to variations in carbohydrate reserve status prior to flowering.

AB - In cultivated grapevines (Vitis vinifera L.), sub-optimal photoassimilatory conditions during flowering can lead to inflorescence necrosis and shedding of flowers and young ovaries and consequently, poor fruit set. However before this study it was not known if carbohydrate reserves augment fruit set when concurrent photoassimilation is limited. Carbohydrate reserves are most abundant in grapevine roots and soil temperature moderates their mobilisation. Accordingly, we grew potted Chardonnay grapevines in soil at 15°C (cool) or 26°C (warm) from bud-break to the onset of flowering to manipulate root carbohydrate reserve status. Then to induce photoassimilatory responses we subjected the plants to low (94 µmol mol-1) CO2 or ambient (336 µmol mol-1) CO2 atmospheres during fruit setting. Analyses of photoassimilation, and biomass and carbohydrate reserve distribution confirmed that fruit set was limited by concurrent photoassimilation. Furthermore, the availability of current photoassimilates for inflorescence development and fruit set was conditioned by the simultaneous demands for shoot and root growth, as well as the restoration of root carbohydrate reserves. The study indicates that great seasonal variability in grapevine fruit set is a likely response of cultivated grapevines to photoassimilatory stresses, such as shading, defoliation and air temperature, and to variations in carbohydrate reserve status prior to flowering.

KW - Open access version available

KW - Biomass partitioning

KW - Carbohydrates

KW - Carbon dioxide

KW - Flowering

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KW - Root growth

KW - Soil temperature

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