The temperature dependence of dormancy breaking in plants: Computer simulation of processes studied under controlled temperatures

Fishman, Svetlana; Erez, A.; Couvillon, G. A.

doi:10.1016/s0022-5193(87)80237-0

Cited by 262 publications

(190 citation statements)

References 11 publications

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“…The chilling requirement until LF (24 CP, beginning of endodormancy) and t 1 (41 CP, end of endodormancy) were relatively constant in all years (Table 4), which allows to calculate the endodormancy phase in phenological models by the dynamic approach [55,56]. Our results confirm the fact that in temperate climates a distinct time lag between t 1 and t 1 * can exist [17,37].…”

Section: Relevance For Phenological Modellingsupporting

confidence: 76%

Identification and Timing of Dormant and Ontogenetic Phase for Sweet Cherries in Northeast Germany for Modelling Purposes

Fm¹,

Kp²

2017

J Hortic

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Section: Relevance For Phenological Modellingsupporting

confidence: 76%

Identification and Timing of Dormant and Ontogenetic Phase for Sweet Cherries in Northeast Germany for Modelling Purposes

Fm¹,

Kp²

2017

J Hortic

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“…23 Chill unit models provide information on how cultivars fare under the current and future climate conditions, inform producers of the stage of phenological development during the growing season and prediction of maturity dates which improve market delivery of fruits. Three important monitoring systems for chill units have been commonly applied: the Utah (Richardson) model 24 measuring RCU, the Infruitec model (daily positive Utah model) measuring Infruitec chill units and the dynamic chill model 25,26 measuring dynamic chill portion (DCP). Studies on winter chill and chilling requirements often implicitly assume that all models can be used interchangeably because the choice of model is not important.…”

Section: Impact Of Climate Change On Chill Unit Accumulationmentioning

confidence: 99%

“…This model has been established to give a more precise estimate of winter chilling in regions with mild winters, as well as in areas suffering from very cold winters. 32 The dynamic model 25,26 was introduced in the 1980s as a new concept for the negation process 32 . This model is based on the premise that winter chill accumulates as a result of a two-step process.…”

Section: Impact Of Climate Change On Chill Unit Accumulationmentioning

confidence: 99%

simulation study on the effect of climate change on crop water use and chill unit accumulation

Ogundeji¹,

Jordaan²

2017

S. Afr. J. Sci.

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Climate change and its impact on already scarce water resources are of global importance, but even more so for water scarce countries. Apart from the effect of climate change on water supply, the chill unit requirement of deciduous fruit crops is also expected to be affected. Although research on crop water use has been undertaken, researchers have not taken the future climate into consideration. They also have focused on increasing temperatures but failed to relate temperature to chill unit accumulation, especially in South Africa. With a view of helping farmers to adapt to climate change, in this study we provide information that will assist farmers in their decision-making process for adaptation and in the selection of appropriate cultivars of deciduous fruits. Crop water use and chill unit requirements are modelled for the present and future climate. Results show that, irrespective of the irrigation system employed, climate change has led to increases in crop water use. Water use with the drip irrigation system was lower than with sprinkler irrigation as a result of efficiency differences in the irrigation technologies. It was also confirmed that the accumulated chill units will decrease in the future as a consequence of climate change. In order to remain in production, farmers need to adapt to climate change stress by putting in place water resources and crop management plans. Thus, producers must be furnished with a variety of adaptation or management strategies to overcome the impact of climate change.

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“…However, it is rather very difficult to express the agriculture related effects of the climate change in numbers and figures as the soil-plant-atmosphere system is very complex. Different simulation models of winter chill accumulation have been developed which are purely empirical and based on either field observations [14] or controlled temperature experiments [15] rather than on a functional understanding of tree physiology. The most widely used models to calculate chill units are as follows-…”

Section: Calculation Of Chill Unitsmentioning

confidence: 99%

Implications of Changing Climate on Productivity of Temperate Fruit Crops with Special Reference to Apple

Joshi¹

2015

Horticulture

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Winter chill is essential for most of the plants that fall dormant in the winter in order to avoid frost damage and do not resume growth until a certain amount of winter chill has accumulated for fulfilling their chilling requirement. Climate change is likely to affect chilling requirement of temperate fruit crops significantly and therefore, the opportunity to meet this requirement will be reduced as the climate becomes warmer. Increase in average global temperature would move the existing plant species and varieties to new latitudinal belts with favourable climates. It is, therefore, possible that crops that are used to be productive in one area may no longer be so or the other way round. The resultant of these climate changes are clearly apparent in the shifting of apple cultivation from lower elevations to higher altitudes in India.Insufficient chilling greatly influences flower initiation and fruit colouration along with deterioration in fruit texture and taste. Further, the lack of proper chilling is also posing serious problems like scab disease, premature leaf fall and infestation of red spider mite in apple. High temperature and moisture stress is increasing sunburn and cracking in apple, apricots and cherries in the higher altitudes. Insufficient chilling reduces pollination, fruit set and ultimately the yield in walnuts, pistachio and peaches. Advanced flowering has been found in olive, apple and pear. Reduced flower size and pedicel lengths were observed in cherry due to less chilling.The studies regarding impact of climate change on fruit crops is meagre primarily due to lack of data, appropriate modeling and government policies. Development of low chill cultivars with greater tolerance to stresses, use of GIS to match varieties with the projected suitable production locations, development of suitable dormancy and chilling models, altering orchard microclimate and use of rest breaking chemicals are the viable approaches that can be adopted to yield reliable results on regional scale.

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The temperature dependence of dormancy breaking in plants: Computer simulation of processes studied under controlled temperatures

Cited by 262 publications

References 11 publications

Identification and Timing of Dormant and Ontogenetic Phase for Sweet Cherries in Northeast Germany for Modelling Purposes

Identification and Timing of Dormant and Ontogenetic Phase for Sweet Cherries in Northeast Germany for Modelling Purposes

simulation study on the effect of climate change on crop water use and chill unit accumulation

Implications of Changing Climate on Productivity of Temperate Fruit Crops with Special Reference to Apple

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