Evaluations of Chill Unit and Accumulated Temperature for Prediction of Sprouting Date of^|^lsquo;Muscat of Alexandria^|^rsquo;Grapevines

Takagi, Nobutomo; Tamura, Humito

doi:10.2503/jjshs.56.24

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…Subsequent periods (12 Jan to 10 April) with additional chilling were correlated with high VIP values and negative coefficients, indicating that dormancy breaking was in progress due to additional chilling. This finding is consistent with the results of previous studies on temperate woody perennials, which showed that additional chilling exposure reduced a quantity of heat requirement and increased the percentage of budbreak (Takagi and Tamura 1987, Dokoozlian 1999, Luedeling et al 2013b, Guo et al 2015. Thus, the temperature response patterns estimated by PLS regression were consistent with those of previous studies on the physiology of dormancy in grapevines and fruit trees.…”

Section: Temperature Responses Of Delaware Budbreaksupporting

confidence: 92%

Evaluation of Chilling and Heat Requirements for the Budbreak of Delaware Grape in Osaka, Japan

Kamimori,

Hosomi

2024

Am J Enol Vitic.

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Background and goalsTe mpe rate woody pe re nnials , including grapes, require chilling and heat accumulation during dormancy to initiate growth in the following spring. The quantification of chilling and heat requirements is critical for a more accurate prediction of endodormancy breaking or budbreak. We aimed to estimate the chilling and heat requirements of Delaware grape in Osaka, Japan, by using partial least squares (PLS) regression to correlate the budbreak dates of Delaware with temperature variations from 1963 to 2022.

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Section: Temperature Responses Of Delaware Budbreaksupporting

confidence: 92%

Evaluation of Chilling and Heat Requirements for the Budbreak of Delaware Grape in Osaka, Japan

Kamimori,

Hosomi

2024

Am J Enol Vitic.

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“…However, we investigated the relation between the accumulated temperature from the day after bud break to the full bloom date, AT D = ∑ i = 1 D T i , and DOY of the bud break date x in this study. Similar to results reported by Takagi and Tamura (1987), the larger x Fig. 9.…”

Section: Sitesupporting

confidence: 86%

“…Many earlier studies included the assumption that grape growth progress after bud break is independent of time. However, Takagi and Tamura (1987) reported the relation between development and time for completion of the grape dormancy process. Their study investigated the bud break process of 'Muscat of Alexandria' grapes planted in a greenhouse.…”

Section: Sitementioning

confidence: 99%

“…Results showed that a later heating start date was associated with a smaller accumulated temperature necessary for bud break. Takagi and Tamura (1987) reported that this result may be related to the degree of the dormancy completion and that the degree of dormancy completion was determined by the degree of low temperature to which the grapes were exposed as well as the time of exposure. However, we investigated the relation between the accumulated temperature from the day after bud break to the full bloom date, AT D = ∑ i = 1 D T i , and DOY of the bud break date x in this study.…”

Section: Sitementioning

confidence: 99%

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Nonlinear Multivariate Prediction Model of ‘Kyoho’ Grape Full Bloom Dates in Japan

et al. 2022

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In this study, after developing a method for predicting full bloom dates of 'Kyoho' grape by incorporating 'Kyoho' growth characteristics at multiple sites in Japan into one model, we evaluated the prediction accuracy of the model. Using data of bud break dates and full bloom dates of 'Kyoho' at 14 public test sites from 2000-2018, we investigated the grape development characteristics at the sites. The conventional effective accumulated temperature model relies on the assumption of a linear relation between temperature and grape development. However, based on results of grape development characteristic analyses, we formulated new prediction models that include the following considerations: 1) a nonlinear relation between temperature and grape development, 2) effects of solar radiation on grape development, and 3) relations between Day of Year (DOY) of bud break date and grape development. Prediction analyses of two types were applied to full bloom dates at the 14 sites using the effective accumulated temperature model and our model, which includes the three considerations above simultaneously. For the first analysis, after estimating the model parameters for each site using data observed at that site, we predicted full bloom dates there. Evaluation of the prediction accuracy using leave-one-out cross validation revealed that the average root mean square error (RMSE) for all sites was 2.24 days for the effective accumulated temperature model. For our model, it was 2.06 days. The model had higher prediction accuracy at multiple sites. For the second analysis, we used the model parameters for each site based on data collected at all sites except the site in question. The average RMSE for all sites was 2.76 days for the effective accumulated temperature model and 2.54 days for our model. These results suggest that our model of 'Kyoho' growth characteristics at multiple sites can predict full bloom dates with higher accuracy than the effective accumulated temperature model.

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“…Erez 4 and Richardson et al 17 introduced the concept of the "chill unit" which uses accumulated temperature calculated from recorded low temperatures for the estimation of the breaking of bud dormancy. Although this concept was broadly adopted mainly for deciduous crops such as apple 1 , blueberry 16 and grape 24 , it remains to be determined whether it can be adopted for an evergreen plant like tea. In this study, we did not construct any models for bud dormancy with the "chill unit" because the concept of "dormancy" was not suitable for tea.…”

Section: Discussionmentioning

confidence: 99%

Modeling Winter Dormancy of Tea Buds and Simulation in Southern Japan

Omae

Takeda²

2003

JARQ

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As part of the research aimed at elucidating the cause of low tea yields in the first crop in southern Japan, the relation of climatic conditions to winter bud dormancy was investigated using mature 'Yabukita' (Camellia sinensis (L.) O. Kuntze) plants at the Makurazaki Station (N 31° 16.1´) of the National Institute of Vegetable and Tea Science (NIVTS), Japan, as a model. The number of days required for flushing (RDF), when winter tea branches were kept under optimal artificial conditions (25°C, 14-hour daylength and 80% relative humidity), was used as an indicator for expressing the degree of winter bud dormancy. RDF was well predicted by the model [-aT-bD+c (T: mean temperature, D: daylength and a,b,c: parameters)] with the lowest standard error (1.71) and the lowest value of Akaike's Information Criterion (AIC = 124.06). The simulation of winter bud dormancy indicated that tea grown in Okinawa located in the southernmost region of Japan (N 26° 13´) is highly susceptible to sudden flushing during winter. The results suggested that urgent measures should be taken to alleviate low tea yields in the first crop in southern Japan.

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Evaluations of Chill Unit and Accumulated Temperature for Prediction of Sprouting Date of^|^lsquo;Muscat of Alexandria^|^rsquo;Grapevines

Cited by 4 publications

References 4 publications

Evaluation of Chilling and Heat Requirements for the Budbreak of Delaware Grape in Osaka, Japan

Evaluation of Chilling and Heat Requirements for the Budbreak of Delaware Grape in Osaka, Japan

Nonlinear Multivariate Prediction Model of ‘Kyoho’ Grape Full Bloom Dates in Japan

Modeling Winter Dormancy of Tea Buds and Simulation in Southern Japan

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