Effects of hydrogen cyanamide on antioxidant enzymes’ activity, proline and polyamine contents during bud dormancy release in Superior Seedless grapevine buds

Mohamed, Hatem Ben; Vadel, Ahmedou M.; Geuns, Jan; Khemira, Habib

doi:10.1007/s11738-011-0839-0

Cited by 34 publications

(35 citation statements)

References 44 publications

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“…In the "Superior Seedless" grapevines, subjected to 2/3 of cold requirements (300 h below 5.0˚C), the hydrogen cyanamide application at 2.0% provided sprouting of 85% of buds, while the branches that did not receive the compound applications had only 40% of sprouted buds [18].…”

Section: Resultsmentioning

confidence: 99%

Breaking Dormancy of “Tupy” Blackberry in Subtropical Conditions

Segantini¹,

Leonel

Ripardo³

et al. 2015

AJPS

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In subtropical or tropical conditions, the insufficient winter chill accumulation is often a limiting factor to break the dormancy of temperate-climate species such as the blackberry, which requires using products to help break dormancy. This study evaluates the efficacy of compounds in breaking dormancy of blackberry and its consequent influence on phenology and crop yields. The experiment was conducted in São Manuel, State of São Paulo, Brazil, in the 2011/2012 production cycle. The plants used were two-year-old "Tupy" blackberry (Rubus spp.), with 0.6 × 4.0 m spacing (4.166 plants·ha −1 ). Pruning was performed in August, followed by the application of these treatments: control (water); hydrogen cyanamide (Dormex ® ); nitrogen fertilizer (Erger ® ) and mineral oil (Assist ® ). The concentrations of each compound used were: 2.0%, 4.0%, 6.0% and 8.0%. The compounds used influenced the budding, flowering and fruit harvest stages, in addition to providing increased yields depending on the concentration used. For hydrogen cyanamide the recommended concentration is of 4.2% and 5.4% for nitrogen fertilizer; doses above these concentrations may cause phytotoxic effects. For mineral oil the dose recommended is of 8.0%.

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Section: Resultsmentioning

confidence: 99%

Breaking Dormancy of “Tupy” Blackberry in Subtropical Conditions

Segantini¹,

Leonel

Ripardo³

et al. 2015

AJPS

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“…P erez and Lira (2005) hypothesized that hydrogen peroxide acts as a secondary messenger to signal the release of endodormancy in grapevines (Vitis vinifera L.). This hypothesis was later supported by Mohamed et al (2012) upon finding that, before dormancy release, an accumulation of hydrogen peroxide causes a temporary oxidative stress in grape buds following an exogenous application of hydrogen cyanamide. Similar hypotheses have been posited regarding hydrogen peroxide's role as a signal in seed dormancy release (Oracz et al, 2007).…”

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confidence: 86%

“…Little is known about the mechanism of endodormancy release in most plant species, but in seeds, which have been investigated most thoroughly, there is generally a strong association with abscisic acid degradation and gibberellic acid synthesis as dormancy is broken (N ee et al, 2017). Successful use of chemical treatments to break endodormancy in seeds and the buds of woody plants using compounds such as hydrogen cyanamide have been reported (Horvath et al, 2003;Mohamed et al, 2012;Vergara and P erez, 2010). Hydrogen cyanamide acts as a catalase inhibitor, which is a key enzyme that removes reactive oxygen species from plant cells.…”

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confidence: 99%

“…Hydrogen cyanamide acts as a catalase inhibitor, which is a key enzyme that removes reactive oxygen species from plant cells. When administered to endodormant grapevine buds, hydrogen cyanamide was shown to increase levels of hydrogen peroxide in cells before breaking dormancy (Mazzitelli et al, 2007;Mohamed et al, 2012;P erez and Lira, 2005). P erez and Lira (2005) hypothesized that hydrogen peroxide acts as a secondary messenger to signal the release of endodormancy in grapevines (Vitis vinifera L.).…”

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confidence: 99%

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Breaking Onion Bulb Endodormancy with Hydrogen Peroxide

D’Angelo¹,

Goldman²

2019

horts

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Long-day storage onion bulbs (Allium cepa) undergo a period of endodormancy that begins before harvest and lasts for several weeks, depending on the genotype. Onion seed production relies on cold treatment to break endodormancy and vernalize the bulbs. When bulbs are planted shortly after harvest, endodormancy results in delayed growth and, in turn, slower flowering and seed production. Through this work we sought to explore the use of hydrogen peroxide as a treatment to break dormancy in onion bulbs. Endodormant bulbs of two long-day cultivars, Cortland and Sherman, were treated with hydrogen peroxide solutions at various concentrations in a series of experiments over a 3-year period and were monitored for root and leaf (sprout) development. We found a 2- to 4-hour exogenous treatment of 20% (weight by volume) hydrogen peroxide to be highly effective at initiating uniform root growth in endodormant bulbs. When compared with a purified water control, the 20% treatment resulted in a 61.3% average reduction in the time to rooting in 2016. We also observed improved uniformity in rooting time between ‘Cortland’ and ‘Sherman’ in all 3 years of this work. We propose this novel method as a tool for breeders, researchers, and seed producers seeking rapid, uniform endodormancy release in onion bulbs to hasten seed production.

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“…Rest-breaking chemicals such as hydrogen cyanamide were shown to cause sub-lethal stress within the treated tissue which leads to endodormancy release 12 ; the mechanisms involved are still not well understood. The available evidence indicates that dormancy interruption is tightly associated with oxidative processes taking place in the dormant structure [13][14][15] . In dormant grapevine buds, hydrogen cyanamide inhibits both the activity of the antioxidant enzyme catalase (CAT, EC 1.11.1.6) and the expression of its gene 13 leading to a transient accumulation of hydrogen peroxide (H 2 O 2 ) which regulates the release of endodormancy and budbreak 15,16 .…”

mentioning

confidence: 99%