Irrigation Improves Vine Physiology and Fruit Composition in Grapevine Red Blotch Virus-Infected <i>Vitis vinifera</i> L.

Copp, Cody R.; Levin, A. D.

doi:10.5344/ajev.2021.21007

Cited by 3 publications

(1 citation statement)

References 30 publications

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“…The Central Coast of California, a prominent region with several distinguished American Viticultural Areas (AVAs), is a Mediterranean-climate region stretching along the coast of California from San Francisco Bay to Santa Barbara County. Most vineyards on the Central Coast of California apply supplemental irrigation, intending to improve quality, yield, phenolic composition, and water efficiency [23,24]. Studies have shown that the timing of reduced deficit irrigation on grapes before and after véraison can increase phenolics and anthocyanins [12,23,25].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Supplemental Irrigation on a Dry-Farmed Vitis vinifera L. cv. Zinfandel Vineyard as a Function of Vine Age

et al. 2023

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With natural rainfall and surface water availability becoming scarce, prolonged droughts are expected to become more frequent, thereby creating issues for agriculture. In viticulture, a lack of rainfall is often supplemented with irrigation during the growing season and/or dormancy. However, with surface and groundwater resources declining in addition to current changes in rainfall patterns, it is unlikely that supplemental irrigation will continue to be an available tool for most growers. As such, this study aims to evaluate the effect of dry farming and supplemental irrigation during the growing season on vine performance and fruit composition as a function of vine age in Zinfandel grapevines. A historically dry-farmed vineyard block with interplanted vines of varying ages was evaluated during the 2021 growing season. Treatments included young vines (5–12 years old), control vines (2:1 ratio of old to young vines representative of the block), and old vines (40–60 years old); each age designation included irrigated and dry-farmed vines. Based on age-specific ETc and to replenish 95% of crop evapotranspiration (ETc), irrigation was manually applied to the irrigated treatment vines at véraison and véraison + 4 weeks. Results indicated no significant changes in phenological progression, leaf senescence, or physical berry analysis when irrigation was added to dry-farmed vines, as most differences were driven by vine age in most parameters measured. Irrigated vines were slightly more advanced in phenological growth and senescence progression compared to dry-farmed vines. Results suggest that the practice of applying supplemental irrigation during the growing season, provided winter rainfall or additional winter irrigation is sufficient, does not have significant impacts on vine performance. Thus, dry farming during the growing season is a reasonable alternative practice in Zinfandel, even in periods of drought.

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Section: Introductionmentioning

confidence: 99%

The Effect of Supplemental Irrigation on a Dry-Farmed Vitis vinifera L. cv. Zinfandel Vineyard as a Function of Vine Age

et al. 2023

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Disentangling the cascading effects of Grapevine Red Blotch Virus infection on vine physiology

Copp

DeShields

Kar

et al. 2023

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Grapevine Red Blotch Virus is a major grapevine pathogens and is associated with reduced carbon assimilation and delayed berry ripening in Vitis vinifera L. Recent work suggests that the virus alters leaf carbon metabolism prior to emergence of visible symptoms. Therefore, diurnal and seasonal measurements were conducted to quantify changes in leaf carbon balance and to elucidate the chronology of symptom progression in leaves and fruit. Healthy and infected vines were assayed in a commercial vineyard during which leaf water relations, photosynthesis, and nonstructural carbohydrates were measured. Additionally, sugar and anthocyanin accumulation in the fruit were monitored at the end of the season to characterize the impact of the virus on ripening. Virus infection significantly reduced carbon assimilation pre- and postveraison, but the impact was more pronounced postveraison and during the afternoon when vine water status was the lowest. Similarly, virus infection significantly increased leaf starch concentration pre- and postveraison, but increased leaf starch in infected vines was detected two weeks prior to veraison. Virus infection had the greatest impact on obstructing leaf carbon export postveraison, especially during the afternoon. The virus had no impact on chlorophyll fluorescence, indicating there was no sustained photosystem impairment and suggesting that changes in chlorophyll fluorescence were a transient response to reduced carbon assimilation and export. This study provides evidence that reduced carbon export constitutes a feedback inhibition response to accumulation of leaf starch prior to the appearance of visible symptoms or impacts to ripening, which may aid earlier detection of the virus.

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Cabernet Sauvignon Grapevine (Vitis Vinifera L.) Non-Structural Carbohydrates and Flavonoids are Not Redistributed with Source-Sink Manipulation in Plants with Grapevine Red Blotch Virus

Tanner¹,

Mainos²,

Yu³

et al. 2022

SSRN Journal

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Irrigation Improves Vine Physiology and Fruit Composition in Grapevine Red Blotch Virus-Infected Vitis vinifera L.

Abstract: for technical assistance related to data collection and laboratory work. The authors also thank Results Partners, LLC and Belle Fiore Estate and Winery for their assistance with field plot maintenance and provision of the study site.

Cited by 3 publications

References 30 publications

The Effect of Supplemental Irrigation on a Dry-Farmed Vitis vinifera L. cv. Zinfandel Vineyard as a Function of Vine Age

The Effect of Supplemental Irrigation on a Dry-Farmed Vitis vinifera L. cv. Zinfandel Vineyard as a Function of Vine Age

Disentangling the cascading effects of Grapevine Red Blotch Virus infection on vine physiology

Cabernet Sauvignon Grapevine (Vitis Vinifera L.) Non-Structural Carbohydrates and Flavonoids are Not Redistributed with Source-Sink Manipulation in Plants with Grapevine Red Blotch Virus

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