Dormancy related traits and adaptation of sweet cherry in Northern Africa: A case of study in two Tunisian areas

Gannouni, Thouraya Azizi; Campoy, José Antonio; Quero-Garcia, José; Barreneche, Teresa; Arif, Abderrazak; Albouchi, Ali; Ammari, Youssef

doi:10.1016/j.scienta.2017.03.013

Cited by 29 publications

(15 citation statements)

References 30 publications

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“…Despite of the high variations detected in the number of days from dormancy breaking to blooming (coefficients of variation (CV) between years for each cultivar ranging 30 -40%), the heat requirements were significantly consistent (CV = 12%) in both cultivars: 6339 ± 535 for 'Bing', and 6411 ± 377 for 'Burlat' (Table 1). These heat requirements were similar to those reported for different sweet cherry cultivars grown under low winter chilling conditions (Alburquerque et al, 2008;Gannouni et al, 2017), suggesting a consistent heat requirements for sweet cherry cultivars. These values are remarkably higher than heat requirements reported for peach (Richardson et al, 1974) and apricot (Julian et al, 2014).…”

Section: A B C D Esupporting

confidence: 84%

Pollen meiosis and chilling requirements in sweet cherry

Fadón¹,

Herrero²,

Rodrigo³

2019

Acta Hortic.

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In sweet cherry, as other temperate woody perennials, cycles of growth and dormancy are synchronized with the seasons. Flower primordia survive to low winter temperatures entering a dormant stage, but chilling is also required for a proper blooming. However, the biological mechanisms behind dormancy and chilling requirements are still not fully understood. In other species, pollen meiosis has been reported as one of the first biological events occurring after dormancy, but this process has not been studied in sweet cherry. In this work, pollen development has been characterized under the microscope in the cultivars 'Burlat' and 'Bing' in relation to winter dormancy up to anthesis during five years. The chilling requirements of both cultivars were empirically determined, and the dates of chilling fulfilment were related to meiosis and flowering time. During endodormancy, the anthers presented the sporogenous tissue formed by the pollen mother cells. First changes in pollen mother cells were detected about three weeks after chilling fulfillment as prelude of anther meiosis, which was completed within a week. Then pollen development continued during two or three weeks up to anthesis. Positive correlations were found between the dates of chilling fulfilment, pollen meiosis and full bloom for both cultivars. These results showed the influence of chilling winter temperatures on pollen meiosis time.

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Section: A B C D Esupporting

confidence: 84%

Pollen meiosis and chilling requirements in sweet cherry

Fadón¹,

Herrero²,

Rodrigo³

2019

Acta Hortic.

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“…The Dynamic model is used to determine the chill requirements of different cultivars since it is the adequate model for Mediterranean conditions [29]. These results and the study of Azizi-Gannouni et al [31] showed that the cultivars "Bouargoub," V1, and V3 registered less chill requirements than the other cultivars.…”

Section: Chilling Requirement For Breaking Dormancymentioning

confidence: 88%

“…From the beginning of the chilling accumulation (first week of November), five branches of each cultivar (length of 40 cm, base diameter of 8-10 mm) were picked every 3-4 days from trees in the orchards and the bases were placed in a 5% sucrose solution in a growth chamber, making a fresh cut at the base of the branches [30,31].…”

Section: Chilling Requirement For Breaking Dormancymentioning

confidence: 99%

“…The chilling requirements for breaking dormancy of the sweet cherry cultivars planted in Ain-Draham, Tibar [31], and Bousalem ( Table 5) showed different chilling requirements (CR) compared to the geographic area and climatic conditions of the year according to the three models. The Dynamic model is used to determine the chill requirements of different cultivars since it is the adequate model for Mediterranean conditions [29].…”

Section: Chilling Requirement For Breaking Dormancymentioning

confidence: 99%

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Flowering of Sweet Cherries “Prunus avium” in Tunisia

Azizi-Gannouni¹,

Ammari²

2020

Prunus

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In Tunisia, the development of cherry growing is limited by two major constraints, namely, the chilling requirements and the self-incompatibility of some cultivars. In order to contribute to the development of this high added-value culture, which is capable to play an important socioeconomic role in rural and semi-forestry places, this study has set the main objective, characterization, and selection of best-suited cultivars to mild winter based on the blooming period. The plant materials used for this study are composed of the introduced cultivars, which are "Napoleon," "Van," "Moreau," "Sunburst," and "Stella," and unknown cultivars, which are "V1," "V2," "V3," "V4," and "V5," and a local one "Bouargoub." Differential behavior between cultivars was shown for phenological stages (budbreak, flowering, maturity, and leaf fall), and this behavior is dependent in some cases on the cold requirement [chilling requirements (CR)]. The local cultivar "Bouargoub" recorded the lowest "CR" with early flowering and maturity.

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“…To assess CR, two methods were used. Firstly, the commonly used approach which defined CR as the field accumulated chill which leads to 50% of the buds above stage BBCH 55 after 10 days in forcing conditions (Ruiz et al , 2007; Alburquerque et al , 2008; Campoy et al , 2012; Sánchez-Pérez et al , 2012; Azizi Gannouni et al , 2017), hereby referred as CR-50%. For this study, the second method used a similar approach but set a higher bud break requirement, 90%, estimated as the maximum bud break percentage recorded after a prolonged forcing period (2-3 weeks), named here CR m -90%.…”

Section: Methodsmentioning

confidence: 99%

Productivity definition of the chilling requirement reveals underestimation of the impact of climate change on winter chill accumulation

Campoy

Darbyshire

Dirlewanger

et al. 2018

Preprint

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13Evaluation of chilling requirements (CR) of cultivars of temperate fruit trees provides key 14 information to assess regional suitability, according to winter chill, for both industry expansion 15 and ongoing profitability as climate change continues. Traditional methods for calculating CR 16 use climate controlled chambers and define CR using a fixed budburst percentage, usually close 17 to 50% (CR-50%), without considering the productivity level associated to this percentage. This 18 CR-50% definition may underestimate the real CR of tree crops for optimal productivity. This 19 underestimation is particularly important to consider as winter chill accumulation is declining 20 in many regions due to climate change. In this work we used sweet cherry to analyse the 21 traditional method for calculating CR in many Rosaceae species (CR-50%) and compared the 22 results with more a restrictive, productivity focused method, with CR defined with a 90% bud 23 2 break level (90%, CRm-90%) close to the optimal budburst which assures productivity. Climate 24 projections of winter chill suitability across Europe using CR-50% and CRm-90% were 25 calculated. Regional suitability landscape was highly dependent on the method used to define 26 CR and differences were found for a wide area of the European geography, both cold and mild 27 winter areas. Our results suggest a need to use an optimal budburst level for the assessment of 28 CR for sweet cherry. The use of traditional methods to determine CR can result in an 29 underestimation of productivity CR with negative consequences for the fruit industry, 30 particularly as climate change advances. 31

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Dormancy related traits and adaptation of sweet cherry in Northern Africa: A case of study in two Tunisian areas

Cited by 29 publications

References 30 publications

Pollen meiosis and chilling requirements in sweet cherry

Pollen meiosis and chilling requirements in sweet cherry

Flowering of Sweet Cherries “Prunus avium” in Tunisia

Productivity definition of the chilling requirement reveals underestimation of the impact of climate change on winter chill accumulation

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