Chilling Requirements for Blooming in Apricot Tree, Determined Either by a Statistical Method or by an Experimental Method and Valued According to an Exponential Conception of Temperature Action

Legave, Jean-Michel; Garcia, G.

doi:10.17660/actahortic.1983.121.10

Cited by 4 publications

(4 citation statements)

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“…Mean fresh weights of floral primordia were measured immediately after the sampling. Endodormancy break was estimated using the method of flower primordia fresh weight developed by Brown & Kotob () and validated for apricot tree by Legave & Garcia () in the south part of France, where spring is warm enough. Endodormancy break date corresponded to the time when mean fresh weights increase of 15% between two successive sampling dates indicating a transition from low rate of primordia growth, which is characteristic of the endodormancy phase, toward large rate of primordia growth, which is characteristic of the ecodormancy phase.…”

Section: Methodsmentioning

confidence: 99%

Can phenological models predict tree phenology accurately in the future? The unrevealed hurdle of endodormancy break

Chuine

Bonhomme

Legave

et al. 2016

Global Change Biology

202

187

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The onset of the growing season of trees has been earlier by 2.3 days per decade during the last 40 years in temperate Europe because of global warming. The effect of temperature on plant phenology is, however, not linear because temperature has a dual effect on bud development. On one hand, low temperatures are necessary to break bud endodormancy, and, on the other hand, higher temperatures are necessary to promote bud cell growth afterward. Different process-based models have been developed in the last decades to predict the date of budbreak of woody species. They predict that global warming should delay or compromise endodormancy break at the species equatorward range limits leading to a delay or even impossibility to flower or set new leaves. These models are classically parameterized with flowering or budbreak dates only, with no information on the endodormancy break date because this information is very scarce. Here, we evaluated the efficiency of a set of phenological models to accurately predict the endodormancy break dates of three fruit trees. Our results show that models calibrated solely with budbreak dates usually do not accurately predict the endodormancy break date. Providing endodormancy break date for the model parameterization results in much more accurate prediction of this latter, with, however, a higher error than that on budbreak dates. Most importantly, we show that models not calibrated with endodormancy break dates can generate large discrepancies in forecasted budbreak dates when using climate scenarios as compared to models calibrated with endodormancy break dates. This discrepancy increases with mean annual temperature and is therefore the strongest after 2050 in the southernmost regions. Our results claim for the urgent need of massive measurements of endodormancy break dates in forest and fruit trees to yield more robust projections of phenological changes in a near future.

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Section: Methodsmentioning

confidence: 99%

Can phenological models predict tree phenology accurately in the future? The unrevealed hurdle of endodormancy break

Chuine

Bonhomme

Legave

et al. 2016

Global Change Biology

202

187

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“…This finding makes the quantification of bud water content potentially interesting as a low-tech method to investigate the dormancy status of temperate deciduous tree species during spring. The increase in dry and fresh weights of flower primordia with winter progression has been used as a marker of dormancy break in fruit trees (e.g., Brown and Kotob 1957 , Legave and Garcia 1982 ). Basler and Körner (2014) found increasing bud areas for deciduous forest trees with progression of spring under natural conditions, but to the best of our knowledge, no study has examined the bud water content change as winter progresses for forest trees leaf buds.…”

Section: Discussionmentioning

confidence: 99%

Stable water isotopes reveal the onset of bud dormancy in temperate trees, whereas water content is a better proxy for dormancy release

Walde,

Wenden,

Chuine

et al. 2024

Tree Physiology

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Earlier spring growth onset in temperate forests is a visible effect of global warming that alters global water and carbon cycling. Consequently, it becomes crucial to accurately predict the future spring phenological shifts in vegetation under different climate warming scenarios. However, current phenological models suffer from a lack of physiological insights of tree dormancy, and are rarely experimentally validated. Here, we sampled twig cuttings of five deciduous tree species at two climatically different locations (270 and 750 m ASL, ~2.3°C difference) throughout the winter 2019/2020. Twig budburst success, thermal time to budburst, bud water content, and short-term 2H-labelled water uptake into buds were quantified to link bud dormancy status with vascular water transport efficacy with the objective of establishing connections between the dormancy status of buds and their effectiveness in vascular water transport. We found large differences in dormancy status between species throughout the entire investigation period likely reflecting species-specific environmental requirements to initiate and release dormancy, whereas only small differences in dormancy status was found between the two studied sites. We found strong 2H-labelled water uptake into buds during leaf senescence, followed by a sharp decrease which we ascribed to the initiation of endodormancy. However, surprisingly, we did not find a progressive increase in 2H-labelled water uptake into buds as winter advanced. Nonetheless, all examined tree species exhibited a consistent relationship between bud water content and dormancy status. Our results suggest that short term 2H-labelled water uptake may not be a robust indicator of dormancy release, yet it holds promise as a method for tracking the induction of dormancy in deciduous trees. In contrast, bud water content emerges as a cost-effective and more reliable indicator of dormancy release.

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“…A further approach was focussed on changes of flower primordia fresh weight in order to estimate t 1 for apricot (Prunis armeniaca L., [17,35,36]) in South France. According to these studies t 1 was related to the date when fresh weight (FW) increased between two successive sampling dates by 15%.…”

Section: Introductionmentioning

confidence: 99%

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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Chilling Requirements for Blooming in Apricot Tree, Determined Either by a Statistical Method or by an Experimental Method and Valued According to an Exponential Conception of Temperature Action

Cited by 4 publications

References 0 publications

Can phenological models predict tree phenology accurately in the future? The unrevealed hurdle of endodormancy break

Can phenological models predict tree phenology accurately in the future? The unrevealed hurdle of endodormancy break

Stable water isotopes reveal the onset of bud dormancy in temperate trees, whereas water content is a better proxy for dormancy release

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

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