Influence of retained node number on Sauvignon Blanc grapevine vegetative growth and yield

Greven, Marc; Bennett, J.S.

doi:10.1111/ajgw.12074

Cited by 29 publications

(61 citation statements)

References 18 publications

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“…Because neither increased node number (Table 1) nor postharvest defoliation (Table 2) significantly changed leaf area or fruit yield, the absence of significant differences in gasexchange during the 2010 and 2011 seasons did not contradict the literature. In interpreting the gas exchange results, it should be kept in mind that despite the greater number of nodes retained, the 72N treatment increased yields only in the first season (Table 1), in agreement with earlier work with Sauvignon blanc in Marlborough (Greven et al 2014).…”

Section: Resultssupporting

confidence: 88%

“…The lower cluster weight was likely due to three consecutive years of lower reserves. These results mirror the outcome from a long-term study done in Marlborough with vines pruned to 24, 36, 48, 60, or 72 nodes, where strong response mechanisms that changed yield components were found according to the number of nodes left at pruning (Greven et al 2014).…”

Section: Resultssupporting

confidence: 79%

“…Laying down 50% more nodes in the 72N treatment created the potential to increase crop by 50%. However, the extra crop load (yield) was achieved only in 2009, the first year of the treatment, and not in subsequent years, similar to reports by Greven et al (2014).…”

Section: Nsupporting

confidence: 85%

“…In 2011 fruit ripening was slower, but all fruit reached the target 20.5 Brix threshold at the same time. Because in 2010 and 2011 yields of both treatments were identical, these similarities in fruit maturity attributes between 48N and 72N vines were not unexpected (Greven et al 2014). Despite both treatments having lower yields in 2010, 72N, with 50% more nodes laid down, dropped yield to equal the 48N vines.…”

Section: Resultsmentioning

confidence: 79%

“…We suggest the change in leaf/fruit ratio between these two years was because 72N vines in 2010 developed from 72-node vines in 2009 instead of from 48-node vines in 2008. This forced the 72N vine into a new equilibrium between fruit and vegetative growth from the second year on (Greven et al 2014, Howell 2001.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Postharvest Defoliation on Carbon and Nitrogen Resources of High-Yielding Sauvignon blanc Grapevines

et al. 2016

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Abstract:We quantified the importance of postharvest carbohydrate assimilation and nitrogen availability to replenish vine reserves, over and above maintaining optimal growth, productivity, and fruit quality of high-yielding, vigorous Sauvignon blanc grapevines. To create different carbohydrate (CHO) and nitrogen (N) reserve concentrations, our factorial-design trial consisted of a postharvest defoliation treatment overlaid with a pruning treatment in which 48 or 72 nodes were retained on four-or six-cane vertical shoot positioned vines, respectively. In defoliation (Defol) vines, all leaves were removed immediately after fruit harvest, while foliated vines (Fol) went through normal senescence. From just after ectodormancy in 2008, samples of root and trunk tissue were taken throughout the years for CHO and N analyses and results were compared with annual yield data. Both defoliation and node number treatments reduced vine growth and yield. Additionally, differences in CHO and N of the permanent structure were found. Depleted winter reserves in trunk and root were replenished during the next growth cycle, suggesting that grapevine N and CHO partitioning favor survival of the permanent structure over increasing vine size and yield. However, after two consecutive years of defoliation, the cumulative effects of smaller, less fruitful canes from year one and reduced carbohydrates from the subsequent year reduced both yield and vegetative growth in the third growing season. Therefore, even the short-lived postharvest canopy in cool climates contributes to the vine CHO economy. Defoliation or excessive crop loads affected carbohydrate reserves in vines, but only after several consecutive years of low recharge; this manifested iteself in lower yields and poorer vegetative growth.

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Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 79%

Section: Nsupporting

confidence: 85%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

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