TY  - JOUR
A1  - Goetz, Klaus-Peter
A1  - Chmielewski, Frank M.
A1  - Homann, Thomas
A1  - Huschek, Gerd
A1  - Matzneller, Philipp
A1  - Rawel, Harshadrai Manilal
T1  - Seasonal changes of physiological parameters in sweet cherry (Prunus avium L.) buds
JF  - Scientia horticulturae : an international journal sponsored by the International Society for Horticultural Science
N2  - The transition from dormant stage to the beginning of growth was first obvious by markedly changes of the water content. The phase from green tip to tight cluster, with a length of only 4 days, was the period of the most physiological activity in single buds, because of the highest daily accumulation rates of fresh/dry weight, C, N. We assume a concentration dependant regulation of the member of the aspartate family (asparagine, aspartic acid, isoleucine) during dormancy, growth and development in sweet cherry buds. The ABA content showed 2011/12 a clear bimodal pattern which was at lower level similar in 2012/13, but not so strong incisive. In both years, the first peak was probably related to the end of endodormancy. However the ABA-isomer content showed in both seasons a unimodal pattern. The maximum of the ratio of ABA-isomer/ABA indicated the beginning of ontogenetic development which starts 3 and 2 weeks later, respectively. Our results suggest that ABA and the ABA-isomer in the sweet cherry buds regulate differentiated metabolic processes in the dormant stage and during bud growth and development. After replication in the season 2013/14 the estimated dates of release of endodormancy, beginning of ecodormancy and start of ontogenetic development will be used to validate and improve phenological models for the beginning of cherry blossom. (C) 2014 Elsevier B.V. All rights reserved.
KW  - Abscisic acid
KW  - Amino acids
KW  - Dormancy
KW  - Flower buds
KW  - Phenological modelling
KW  - Prunus avium L.
Y1  - 2014
U6  - https://doi.org/10.1016/j.scienta.2014.04.012
SN  - 0304-4238
SN  - 1879-1018
VL  - 172
SP  - 183
EP  - 190
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Chmielewski, Frank M.
A1  - Götz, Klaus-Peter
A1  - Homann, Thomas
A1  - Rawel, Harshadrai Manilal
T1  - Identification of Endodormancy Release for Cherries (Prunus Avium L.) by
Abscisic Acid and Sugars
JF  - Journal of Horticulture
N2  - In order to develop reliable and physiologically sound models for the plant development in spring, the date of endodormancy release is always a crucial and mostly unknown model parameter. Until present, classical approaches - such as climate chamber experiments - are used to derive this unknown parameter. In these experiments, progressive plant development or significant changes in bud’s fresh weight or water content are measurable markers for dormancy release. This study presents an alternative approach, which is based on four well-known metabolites. For 5 seasons (2011/12-2015/16), the content of abscisic acid (ABA) and sugars such as fructose, sucrose and glucose in sweet cherry flower buds (cultivar ‘Summit’) were weekly analysed between beginning of October and April. These data allow comparing the annual course of these metabolites with the date of endodormancy release, derived from a classical climate chamber experiment, published in a previous study. Results showed that ABA and sucrose are two important metabolites which can help to identify the date of endodormancy release of sweet cherries. On average, ABA content reached a plateau of 5.65 μg g-1 DW-1 during endodormancy, which was maintained for 3-6 weeks. The significant reduction of the ABA content after this period to 4.41 μg g-1 DW-1 on average during ecodormancy was nearly in agreement with the date of endodormancy release of ‘Summit’ on 28 November (332 DOY).
The annual cycle of sucrose, which has a cryoprotective effect during winter, is well comprehensible and showed a close relationship to
the annual course of minimum air temperature after leaf fall(r=-0.90). The nearly constant level of sucrose during ecodormancy (21.0 mg g-1 DW-1, 5 yr. mean) did not only allow deriving the date of endodormancy release but can also be helpful to define the beginning of ontogenetic development.
KW  - Endodormancy
KW  - Abscisic acid
KW  - Sucrose
KW  - Prunus avium L.
KW  - Flower buds
KW  - Phenological modelling
Y1  - 2017
U6  - https://doi.org/10.4172/2376-0354.1000210
SN  - 2376-0354
VL  - 4
IS  - 3
ER  -