Bud Dormancy in Perennial Fruit Tree Species: A Pivotal Role for Oxidative Cues.

Rémi Beauvieux,Elisabeth Dirlewanger,Bénédicte Wenden

doi:10.3389/fpls.2018.00657

Rémi Beauvieux, Elisabeth Dirlewanger + Show 1 more

Open Access

https://doi.org/10.3389/fpls.2018.00657

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Abstract

For perennial plants, bud dormancy is a crucial step as its progression over winter determines the quality of bud break, flowering, and fruiting. In the past decades, many studies, based on metabolic, physiological, subcellular, genetic, and genomic analyses, have unraveled mechanisms underlying bud dormancy progression. Overall, all the pathways identified are interconnected in a very complex manner. Here, we review early and recent findings on the dormancy processes in buds of temperate fruit trees species including hormonal signaling, the role of plasma membrane, carbohydrate metabolism, mitochondrial respiration and oxidative stress, with an effort to link them together and emphasize the central role of reactive oxygen species accumulation in the control of dormancy progression.

Highlights

In the context of perennial plants, bud dormancy is a crucial step in the phenology cycle, as its progression over winter determines the quality of bud break, flowering and fruiting
As shown for the interaction between ethylene and abscisic acid (ABA), ethylene modulating ABA degradation and signaling (Zheng et al, 2015), all hormonal pathways are interconnected and act together to control dormancy progression this balance may be directly influenced by ROS content, notably through redox control of the activity and symplasmic and apoplastic transport of plant growth regulator or transcriptions factors (Considine and Considine, 2016)
The question remains whether slow accumulation of ROS, as a consequence of winter temperatures and low metabolism, triggers dormancy release when a sub-lethal threshold is reached, or a prompt shift into stress-inducible conditions leads to a dormancy-alleviating response

Summary

Introduction

In the context of perennial plants, bud dormancy is a crucial step in the phenology cycle, as its progression over winter determines the quality of bud break, flowering and fruiting. Recent genomic studies show that a wide range of genes is differentially regulated after HC application such as genes related to cell wall loosening, hormonal response, carbohydrate and protein metabolism (Ophir et al, 2009; Pérez et al, 2009; Liu et al, 2015; Sudawan et al, 2016; Ionescu et al, 2017) linking oxidative stress, mitochondrial activity, hypoxia, cytokinins, auxin, jasmonate and ethylene signaling pathways to HC-induced dormancy release.

Results

Conclusion