Is erratic bud-break in grapevines grown in warm winter areas related to disturbances in mitochondrial respiratory capacity and oxidative metabolism?
Francisco J. Pérez A C , Sebastián Rubio A and Juan Ormeño-Núñez BA Universidad de Chile, Facultad de Ciencias, Lab. Bioquímica Vegetal, Casilla 653, Santiago, Chile.
B INIA C.R.I. La Platina Casilla 493-3, Santiago, Chile.
C Corresponding author. Email: frperez@uchile.cl
Functional Plant Biology 34(7) 624-632 https://doi.org/10.1071/FP06272
Submitted: 27 October 2006 Accepted: 4 April 2007 Published: 4 July 2007
Abstract
Bud-break and the length and depth of endodormancy (ED) were studied in grapevine (Vitis Vinifera L.) cv. Thompson Seedless (Sultana) grown in the Elqui (warm winter) and in the Maipo (temperate winter) valleys of north and central Chile, respectively. High maximum daily winter temperatures, ordinarily occurring in the Elqui valley, reduced the depth without affecting the length of ED in comparison to buds grown in the Maipo valley. Furthermore, high winter temperatures during the ED period altered the oxidative metabolism of buds by increasing its mitochondrial respiratory capacity and increasing its levels of H2O2. Moreover, a reduced expression in alternative oxidase transcript was also observed at the end of the ED period in buds collected from the warmer Elqui valley in relation to those collected from the temperate Maipo valley. In controlled environments, the bud-break response of ecodormant (ECD) buds depended on the climatic zones from which buds were sampled (temperate or warm winter), and on whether growth chamber temperatures were held constant or fluctuated. Mitochondrial respiratory capacity of dormant grapevine buds was raised by warmer winter temperatures, and higher subsequent H2O2 levels at the ECD phase appeared to be related to the erratic breaking of latent buds in subtropical areas such as the Elqui valley.
Additional keywords: alternative oxidase, bud-break, endodormancy, grapevines, hydrogen peroxide, mitochondrial respiration.
Acknowledgements
Financial support of Fondecyt project 1050285 and the kindly collaboration of Carmen Jopia in sending the samples and weather data from the Elqui Valley are gratefully acknowledged. We thank also Alex Crawford for stimulating discussion.
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