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2012 | 34 | 2 |

Tytuł artykułu

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

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
The effect of hydrogen cyanamide (HC) on dormancy release, antioxidant enzyme’s activity and proline and free polyamine contents were investigated in ‘Superior Seedless’ grapevine buds. HC application caused a sharp decrease of catalase (CAT, EC 1.11.1.6) activity and a transient stimulation during the 5 days following treatment of peroxidase (POD, EC 1.11.1.7) and ascorbate peroxidase (APX, EC 1.11.1.11) activities. This coincided with an accumulation of total free polyamines, especially putrescine (Put). Proline content increased dramatically. There was a strong correlation between APX and POD activities and total free PAs and Put contents implying a possible stimulating effect of the latter compounds on these enzymes. These observations indicate that HC triggers an oxidative stress leading to bud endodormancy release. Afterward, as budbreak started, we observed a rapid proline and Put degradation; this could be responsible for reactivation of growth. Indeed, the decline in Put to (Spd + Spm) ratio, reported here, may be considered as a reliable biochemical marker of bud growth resumption.

Słowa kluczowe

Wydawca

-

Rocznik

Tom

34

Numer

2

Opis fizyczny

p.429-437,fig.,ref.

Twórcy

  • Laboratory of Plant Biotechnology Applied to Crop Improvement, Department of Life Sciences, Faculty of Sciences of Gabes, University of Gabes, Cite Erriadh, Zrig, 6072 Gabes, Tunisia
autor
  • Laboratory of Plant Biotechnology Applied to Crop Improvement, Department of Life Sciences, Faculty of Sciences of Gabes, University of Gabes, Cite Erriadh, Zrig, 6072 Gabes, Tunisia
autor
  • Laboratory of Functional Biology, KU Leuven, Kasteelpark Arenberg 31, 3001 Heverlee, Belgium
autor
  • Laboratory of Plant Biotechnology Applied to Crop Improvement, Department of Life Sciences, Faculty of Sciences of Gabes, University of Gabes, Cite Erriadh, Zrig, 6072 Gabes, Tunisia

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