Spring temperatures alter reproductive development in grapevines

Keller, Markus; Tarara, Julie M.; Mills, Lynn J.

doi:10.1111/j.1755-0238.2010.00105.x

Cited by 63 publications

(45 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…!! !# effect is consistent with earlier research that found that warm conditions during the initial shoot development and flower formation period in spring promoted yield formation in grapevines by increasing leaf area, flower size, and fruit set (Keller et al, 2010). It seems plausible that the inverse correlation between yield and early-season rainfall might be related to the general association of rain with low solar irradiance (i. e., cool temperatures and low light intensity).…”

Section: Discussionsupporting

confidence: 80%

Yield of Müller-Thurgau and Riesling grapevines is altered by meteorological conditions in the current and previous growing seasons

Molitor

Keller

2017

OENO One

View full text Add to dashboard Cite

Methods and results:Window pane analysis showed that pre-bloom and bloom minimum temperatures and precipitation sums in the preceding year, winter temperatures, spring temperatures, and post-veraison minimum temperatures in the current year were positively correlated with annual yield; early spring and post-harvest temperatures in the preceding year, and, for Riesling, pre-bloom precipitation sums and post-bloom maximum temperatures in the current year were negatively correlated with annual yield. Models developed from these data simulated annual yield with high accuracy (R 2 adj = 0.88 for Riesling, and R 2 adj = 0.92 for Müller-Thurgau). Conclusions:Meteorological conditions during distinct periods of yield formation are correlated with annual yield. Yield models can be used in practical viticulture as well as in climate change impact studies.Significance and impact of the study: Enhanced understanding of the effects of meteorological conditions during specific periods of yield formation supports growers' efforts to optimize viticultural measures aimed at achieving adequate yield levels.

show abstract

Section: Discussionsupporting

confidence: 80%

Yield of Müller-Thurgau and Riesling grapevines is altered by meteorological conditions in the current and previous growing seasons

Molitor

Keller

2017

OENO One

View full text Add to dashboard Cite

show abstract

“…Thus, while the water deficit was not severe enough to reduce fruit set, it may have been sufficient to limit flower size and hence berry size (cf. Keller et al 2010). Rootstock effects on yield formation varied by scion cultivar, but 3309C and 5C were often associated with high yields.…”

Section: Discussionmentioning

confidence: 99%

“…Flowers per cluster and percent fruit set were estimated by counting abscised flower caps collected in gauze bags (1 mm perforations) and counting the berries of the same clusters (Keller et al 2010). Average flower size for each cluster was estimated by drying (60°C) and weighing the collected flower caps, assuming that cap weight is proportional to flower weight and, hence, size (Keller et al 2010). Yield, clusters per vine, and mean berry weight were determined at harvest and used to estimate clusters per shoot and berries per cluster.…”

Section: Methodsmentioning

confidence: 99%

Rootstock Effects on Deficit-Irrigated Winegrapes in a Dry Climate: Vigor, Yield Formation, and Fruit Ripening

Keller¹,

Mills²,

Harbertson³

2011

Am. J. Enol. Vitic.

Self Cite

View full text Add to dashboard Cite

A rootstock field trial was conducted in the Yakima Valley, southeastern Washington, with three Vitis vinifera cultivars (Merlot, Syrah, Chardonnay). Vines were grown on their own roots or field-grafted to the rootstocks 5C, 99R, 140Ru, 1103P, 3309C, and an unnamed rootstock from Cornell University (here termed 101CU) that is a likely sibling or seedling of 101-14 Mgt. Repeated scion dieback due to cold injury to 99R led us to abandon this rootstock. Vine phenology, vigor, water status, yield formation, and fruit ripening and composition were evaluated during three years beginning in the vineyard's ninth year. Own-rooted Merlot and Chardonnay grew more shoots than grafted vines, and 140Ru and 1103P tended to reduce pruning weights. However, 3309C was the rootstock associated with the highest pruning weights in Syrah and the lowest in Chardonnay. Rootstocks usually did not impact vine phenology, fruit set, and plant water status, although there was a trend for stem water potential to be highest with 3309C and lowest with 5C. The rootstock effect on yield formation depended on the scion cultivar, and variations in different yield components often cancelled out each other, but 3309C (Merlot and Syrah), 5C (Merlot and Chardonnay), and own roots (Chardonnay) were often associated with high yields. Nevertheless, the rootstocks had only minor effects on fruit ripening and did not consistently alter soluble solids, TA, K + , or anthocyanin pigments, but the pH was higher in fruit from own-rooted vines compared with grafted Merlot and Chardonnay. Overall, scion effects and differences due to yearly climate variation far outweighed any differences due to rootstock.

show abstract

“…The strong positive correlation (r = 0.90) between yield per vine and the number of clusters per plant (Table 2), together with the lack of significance with cluster weight and very poor (r = 0.35) with berry weight, suggest that the number of clusters per vine was the key component in determining the final grape production per plant, at the expense of average berry and cluster weight. This is an interesting outcome, as the number of clusters per vine is directly impacted by bud fertility, which is determined at the flowering period in the previous season [60] (May-June 2010). The weather conditions in Spring 2010 at the vineyard of study (data from Navarra Government's meteorological station of Estella) were characterised by intense rainfall (94.9% of average historical rainfall in these two months), low radiation, and cooler temperatures than mean historical values for this area (−1.9 °C in May and −0.6 °C in June), as shown above.…”

Section: Correlation Analysis Between Spectral Indices Field Variablmentioning

confidence: 99%

Using RPAS Multi-Spectral Imagery to Characterise Vigour, Leaf Development, Yield Components and Berry Composition Variability within a Vineyard

et al. 2015

View full text Add to dashboard Cite

Implementation of precision viticulture techniques requires the use of emerging sensing technologies to assess the vineyard spatial variability. This work shows the capability of multispectral imagery acquired from a remotely piloted aerial system (RPAS), and the derived spectral indices to assess the vegetative, productive, and berry composition spatial variability within a vineyard (Vitis vinifera L.). Multi-spectral imagery of 17 cm spatial resolution was acquired using a RPAS. Classical vegetation spectral indices and two newly defined normalised indices, NVI1 = (R802 − R531)/(R802 + R531) and NVI2 = (R802 − R570)/(R802 + R570), were computed. Their spatial distribution and relationships with grapevine vegetative, yield, and berry composition parameters were studied. Most of the spectral indices and field data varied spatially within the vineyard, as showed through the variogram parameters. While the correlations were significant but moderate among the spectral indices and the field variables, the kappa index showed that the spatial pattern of the spectral indices agreed with that of the vegetative variables (0.38-0.70) and mean cluster weight (0.40). These results proved the utility of the OPEN ACCESSRemote Sens. 2015, 7 14459 multi-spectral imagery acquired from a RPAS to delineate homogeneous zones within the vineyard, allowing the grapegrower to carry out a specific management of each subarea.

show abstract

Spring temperatures alter reproductive development in grapevines

Cited by 63 publications

References 34 publications

Yield of Müller-Thurgau and Riesling grapevines is altered by meteorological conditions in the current and previous growing seasons

Yield of Müller-Thurgau and Riesling grapevines is altered by meteorological conditions in the current and previous growing seasons

Rootstock Effects on Deficit-Irrigated Winegrapes in a Dry Climate: Vigor, Yield Formation, and Fruit Ripening

Using RPAS Multi-Spectral Imagery to Characterise Vigour, Leaf Development, Yield Components and Berry Composition Variability within a Vineyard

Contact Info

Product

Resources

About