Oxidative signaling in seed germination and dormancy

El-Maarouf-Bouteau, Hayat; Bailly, Christophe

doi:10.4161/psb.3.3.5539

Cited by 340 publications

(257 citation statements)

References 148 publications

(182 reference statements)

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“…Non-dormant mono maple seeds under stratification with higher accumulation of ROS accomplished germination successfully, which may imply that a causal link between ROS production and dormancy break is likely to exist. This is in agreement with previous findings in other plant species where ROS can act as messengers to signal seeds to complete the transition from a developmental to a germinative mode and the alleviation of dormancy (Oracz et al 2007;El-Maarouf-Bouteau and Bailly 2008). Although ROS may act as a positive signal for seed dormancy release, uncontrolled accumulation of ROS is likely to lead to oxidative damage and prevent radical emergence in non-dormant seeds according to our results ( Fig.…”

Section: Discussionsupporting

confidence: 82%

Oxidative metabolism‐related changes during germination of mono maple (Acer mono Maxim.) seeds under seasonal frozen soil

Qin

Liu

2009

Ecological Research

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Oxidative metabolism-related changes during germination of mono maple (Acer mono Maxim.) seeds under seasonal frozen soil Abstract The influence of seasonal frozen soil and buried depth on germination of mono maple (Acer mono Maxim.) seeds was studied in field conditions in winter in a sub-alpine region. Mono maple seeds almost lost their ability to germinate in non-freezing soil, while seasonal frozen soil treatments facilitated the germination accompanied with a progressive accumulation of reactive oxygen species (ROS). The result indicates that ROS may act as a positive signal for seed dormancy. However, exceeding accumulation of ROS led to decrease in germination rate. We suggest that the shift from a signaling to a deleterious role may be related to the accumulation of these ROS above a threshold level that leads to various cellular alterations and damage. The enhanced activities of antioxidant enzymes appear to be more closely related to freezing tolerance, because of their ability to scavenge ROS to avoid deleterious events. Seasonal frozen soil was beneficial in accelerating the germination of mono maple seeds. However, a slight increase of freezing temperature may have also facilitated the germination of mono maple seeds by enhanced activities of antioxidant enzymes. Hence, moderate winter warming may be beneficial to mono maple regeneration due to the improvement of seed germination, but the disappearance of seasonal frozen soil may lead to germination failure of the mono maple seeds.

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Section: Discussionsupporting

confidence: 82%

Oxidative metabolism‐related changes during germination of mono maple (Acer mono Maxim.) seeds under seasonal frozen soil

Qin

Liu

2009

Ecological Research

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“…Thus, ageing may initially affect principally respiratory capacity, and slower rates of respiration take longer to accomplish the metabolic events required to prepare for radicle emergence. Mitochondria have been proposed to be the primary targets for ageing damage during accelerated ageing (Amable and Obendorf, 1986;Ferguson et al, 1990;Fu et al, 2015), possibly as a result of the action of free radicals and reactive oxygen species (McDonald, 1999;El-Maarouf-Bouteau and Bailly, 2008). Furthermore, the oxidative properties of purified pea seed mitochondria improved during imbibition and due to priming, indicating a correlation between seed quality and mitochondrial function (Benamar et al, 2003).…”

Section: Implications Of Respiration-germination Relationshipsmentioning

confidence: 99%

Single-seed oxygen consumption measurements and population-based threshold models link respiration and germination rates under diverse conditions

Bello

Bradford

2016

Seed Sci. Res.

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Seed germination is responsive to diverse environmental, hormonal and chemical signals. Germination rates (i.e. speed and distribution in time) reveal information about timing, uniformity and extent of germination in seed populations and are sensitive indicators of seed vigour and stress tolerance. Population-based threshold (PBT) models have been applied to describe germination responses to temperature, water potential, hormones, ageing and oxygen. However, obtaining detailed data on germination rates of seed populations requires repeated observations at frequent times to construct germination time courses, which is labour intensive and often impractical. Recently, instruments have been developed to measure repeatedly the respiration (oxygen consumption) of individual seeds following imbibition, providing complete respiratory time courses for populations of individual seeds in an automated manner. In this study, we demonstrate a new approach that enables the use of single-seed respiratory data, rather than germination data, to characterize the responses of seed populations to diverse conditions. We applied PBT models to single-seed respiratory data and compared the results to similar analyses of germination time courses. We found consistent and quantitatively comparable relationships between seed respiratory and germination patterns in response to temperature, water potential, abscisic acid, gibberellin, respiratory inhibitors, ageing and priming. This close correspondence between seed respiration and germination time courses enables the use of semi-automated respiratory measurements to assess seed vigour and quality parameters. It also raises intriguing questions about the fundamental relationship between the respiratory capacities of seeds and the rates at which they proceed toward completion of germination.

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“…Eventually, the antioxidant status of the two fungal lines turns out to be very similar, demonstrating the unexpected capacity of the cured line to compensate for its original lower performance. We can speculate that for both the lines H2O2 also acts as a signal, as it does in dried seeds (Tommasi et al 2001, El-Maarouf-Bouteau andBailly 2008) and in fungal conidia also from pathogenic fungi, where changes in the cellular oxidative status trigger germination (Breitenbach et al 2015). Since H2O2 is a strong antibacterial molecule, the question remains whether CaGg is affected by the treatment, also considering that some of the key enzymes for glutathione biosynthesis were not found in its genome (Ghignone et al, 2012 Given the relevance of AM fungi in natural and agricultural ecosystems, we propose that the data set developed for G. margarita may be a starting point for studying environmental adaptation of AM fungi to the oxidative stress that originates from the application of fungicide or herbicide (Yang et al 2016;Angelova et al 2005).…”

Section: The Fungal Responses To H2o2 Change Depending On the Presencmentioning

confidence: 99%

Gigaspora margarita with and without its endobacterium shows adaptive responses to oxidative stress

et al. 2017

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Arbuscular mycorrhizal (AM) fungi experience oxidative stress during the plant-fungal interaction, due to endogenous reactive oxygen species (ROS) produced by fungal metabolism and exogenous ROS produced by plant cells. Here, we examine the responses to H2O2 in Gigaspora margarita, an AM fungus containing the endobacterial symbiont Candidatus Glomeribacter gigasporarum (CaGg). Previous studies revealed that G. margarita with its endobacterium produces more ATP and has higher respiratory activity compared to a cured line that lacks the endobacterium. This higher bioenergetic potential leads to higher production of ROS, and to a higher ROS-detoxifying capacity, suggesting a direct or indirect role of the endobacterium in modulating fungal anti-oxidant responses. To test the hypothesis that the fungal-endobacterial symbiosis may enhance the fitness of the AM fungus in the presence of oxidative stress, we treated the fungus with a sublethal concentration of H2O2 and performed RNA-seq analysis. Our results demonstrate that: i) irrespective of the endobacterium presence, G. margarita faces oxidative stress by activating multiple metabolic processes (methionine oxidation, sulfur uptake, the pentose phosphate pathway, activation of ROS-scavenger genes), ii) in the presence of its endobacterium, G. margarita upregulates some metabolic pathways, like chromatin status modifications and iron metabolism; iii) contrary to our hypothesis, the cured line responds to H2O2 by activating the transcription of specific ROS scavengers. We confirmed the RNA-seq findings by measuring the glutathione and ascorbate content, which was the same in both lines after H2O2 treatment. We conclude that both fungal lines

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Oxidative signaling in seed germination and dormancy

Cited by 340 publications

References 148 publications

Oxidative metabolism‐related changes during germination of mono maple (Acer mono Maxim.) seeds under seasonal frozen soil

Oxidative metabolism‐related changes during germination of mono maple (Acer mono Maxim.) seeds under seasonal frozen soil

Single-seed oxygen consumption measurements and population-based threshold models link respiration and germination rates under diverse conditions

Gigaspora margarita with and without its endobacterium shows adaptive responses to oxidative stress

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