&lt;b&gt;Dormancy of 'Imperial Gala' apple and 'Hosui' pear tree buds in a region of low chill occurrence

Carvalho, Ruy Inácio Neiva de; Biasi, Luiz Antônio; Zanette, Flávio; Rendoke, José Carlos; Santos, Jean Magnus; Pereira, Gabriely Pinto

doi:10.4025/actasciagron.v36i4.17966

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…The ATBs were also similar: 16.56 days for Curitiba and 18.01 days for Lapa ( Table 1). Considering that ATB below 14 days may be indicative of the absence of endodormancy, especially if associated with FRB above 90% (CARVALHO et al, 2010a), this suggests an independence inducing endodormancy on the occurrence of temperatures below 7.2 °C. Oliveira Filho and Carvalho (2003) found in peach tree buds of Eldorado and Agate cultivars and that the most intense endodormancy occurred with only 15 hours …”

Section: Resultsmentioning

confidence: 99%

“…The other cultivars exhibited variations in the sequence between the two studied areas, regardless of the maturation cycle. Environmental conditions may have an independent effect on the factors related with the endodormancy such as energetic metabolism of the bud, allocation of reserves, carbohydrate flux, short distance nutrient transfer, and hormonal regulation, making the evaluation of the dormancy intensity more difficult (CARVALHO et al, 2014).…”

Section: Of Cold (<72 ° C)mentioning

confidence: 99%

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Bud Dormancy Intensity in Peach Tree Cultivars by Biological and Tetrazolium Test

2016

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-Temperate climate fruit trees often exhibit uneven budding and flowering, due to the low number of chilling hours that determine the occurrence of dormancy and its depth. The objective of this study was to determine the depth of bud dormancy in peach tree cultivars and evaluate the efficiency of the tetrazolium test for dormancy and comparing with biological test. Branches of the cultivars Aurora 1, Chimarrita, Chiripá, Coral, Eldorado, Granada, Leonense, Maciel, Marli, Premier, and Vanguard were collected between May and August 2008 at two locations: Curitiba and Lapa. The evaluation of dormancy was performed using a biological test of single node cuttings through the parameters: average time for bud burst, velocity of bud burst, final rate of bud burst and rate of vigorous bud burst. For the tetrazolium test, 300 mg of buds was used and the color intensity readings were obtained using a spectrophotometer. The peach tree cultivars evaluated differ in the intensity of dormancy in late fall. The most intense endodormancy cultivars found were: Chiripá, Leonense and Eldorado cultivars, and the weaker cultivars found were: Aurora 1 and Maciel. The tetrazolium test was efficient at estimating the intensity of dormancy in peach trees when the occurrence of cold was suitable for installation endodormancy. At a location with the lowest occurrence of cold (Curitiba), the tetrazolium test did not simulated successfully the biological test results.

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Section: Resultsmentioning

confidence: 99%

Section: Of Cold (<72 ° C)mentioning

confidence: 99%

Bud Dormancy Intensity in Peach Tree Cultivars by Biological and Tetrazolium Test

2016

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“…Most of these models are available in an R language package created by Pertille et al (2019). Although none of these models were validated for Brazilian conditions (Malagi et al 2017), chilling hours below 7.2 °C-the Weinberger model- (Weinberger 1950) and the North Carolina Modified Model (Ebert et al 1986) have been used in apple-producing areas in Brazil (Carvalho et al 2014). Based on the statement that accumulated chilling is only susceptible to an antagonistic effect of high temperatures for a few days (Erez and Lavee 1971), Ebert et al (1986) modified the North Carolina Model (Shaltout and Unrath 1983) so that high temperatures resulted in the negation of accumulated chilling only up to 96 h (above 16.5 °C) after the last positive chill units were registered.…”

Section: Introductionmentioning

confidence: 99%

High-chilling requirement apple cultivar has more accentuated acrotony than low-chilling one in mild winter region

Pertille

Citadin

Patto

et al. 2021

Trees

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Key message This study contributed to the understanding of acrotony in apple cultivars in a mild winter region, contrasting high-and low-chilling requirement apple cultivars, and the role of this behavior in plant adaptability. Abstract When there is insufficient chilling accumulation during the cold season, apple trees present erratic and poor budbreak. However, there is a lack of information regarding carbohydrate metabolism and their influence on budbreak and branch architecture in apples grown in subtropical humid climates. This work aimed to evaluate budbreak and the availability of carbohydrates in distal and proximal portions of 1-year-old apple tree shoots, and to verify their relationships with axillary shoot formation in spring. Two apple cultivars 'Eva' and 'Fuji', with low and high chilling requirements, respectively, were assessed in a mild winter region of Brazil. From April to October of 2012, 2013 and 2014, 25 one-year-old shoots of each cultivar were sampled bi-weekly. These shoots were divided into distal and proximal portions. Wood from five shoots was sampled to quantify the nonstructural carbohydrate and alpha-amylase content for each portion. The single-node cutting test was used to observe mean time to budburst for the remaining 20 shoots. In generally, our results suggest that under mild winter conditions, the apple tree does not enter into deep endodormancy. Furthermore, there were biological and biochemical differences between the distal and proximal portions of the bearing-shoots for all the studied variables, likely related to the higher sink force in the distal portion. Consequently, the buds from the distal portion sprout first, thereby establishing a primigenic dominance over the buds of the proximal portion. Our study also suggests that the shallow endodormancy of high chilling requirement cultivars cultivated in mild winter regions would make paradormancy predominant, emphasizing acrotonic branching in these cultivars. There was greater availability of nonstructural carbohydrates and alpha-amylase activity in the wood of the distal portion of 1-year-bearing shoots of apple trees under mild winter conditions, regardless of the cultivar.

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Potential vulnerability of Moroccan apple orchard to climate change–induced phenological perturbations: effects on yields and fruit quality

et al. 2019

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<b>Dormancy of 'Imperial Gala' apple and 'Hosui' pear tree buds in a region of low chill occurrence

Cited by 7 publications

References 17 publications

Bud Dormancy Intensity in Peach Tree Cultivars by Biological and Tetrazolium Test

Bud Dormancy Intensity in Peach Tree Cultivars by Biological and Tetrazolium Test

High-chilling requirement apple cultivar has more accentuated acrotony than low-chilling one in mild winter region

Potential vulnerability of Moroccan apple orchard to climate change–induced phenological perturbations: effects on yields and fruit quality

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