ACC conversion to ethylene by sunflower seeds in relation to maturation,germination and thermodormancy |
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Authors: | F Corbineau R M Rudnicki D Côme |
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Institution: | (1) Laboratoire de Physiologie des Organes Végétaux après Récolte, C.N.R.S., 4 terRoute des Gardes, F-92190 Meudon, France;(2) Research Institute of Pomology and Floriculture, Pomologiczna 18, PL-96-100 Skierniewice, Poland;(3) Laboratoire de Physiologie Végétale Appliquée, Université Pierre et Marie Curie, Tour 53, ler étage, 4, Place Jussieu, F-75252 Paris Cedex 05, France |
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Abstract: | Conversion of exogenous 1-aminocyclopropane-1-carboxylic acid (ACC) to ethylene was studied in sunflower (Helianthus annuus L., cv. Mirasol) seeds in relation to germinability. Ethylene production from ACC decreased during seed maturation, and non-dormant mature seeds were practically unable to synthesize ethylene until germination and growth occurred, indicating that ethylene forming enzyme (EFE) activity developed during tissue imbibition and growth. ACC conversion to ethylene was reduced by the presence of pericarp, and in young seedlings it was less in cotyledons than in growing axes.ACC conversion to ethylene by cotyledons from young seedlings was optimal at c. 30°C, and was strongly inhibited at 45°C. Pretreatment of imbibed seeds at high temperature (45°C) induced a thermodormancy and a progressive decrease in EFE activity.Abscisic acid and methyl-jasmonate, two growth regulators which inhibit seed germination and seedling growth, and cycloheximide were also shown to inhibit ACC conversion to ethylene by cotyledons of 3-day-old seedlings and by inbibed seeds.Abbreviations ABA
abscisic acid
- ACC
1-aminocyclopropane-1-carboxylic acid
- CH
cycloheximide
- EFE
ethylene forming enzyme
- IAA
indole-3-acetic acid
- Me-Ja
methyl-jasmonate |
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Keywords: | abscisic acid ACC conversion ethylene methyl-jasmonate Sunflower seed germination maturation secondary dormancy |
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