Tolerance of kikuyu grass to long term salt stress is associated with induction of antioxidant defences |
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Authors: | Adele Muscolo Maria Sidari Maria Rosaria Panuccio |
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Institution: | (1) Department of Plant Physiology, University of Szczecin, W ska 13, 71-415 Szczecin, Poland |
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Abstract: | Primary dormancy in A. retroflexus seeds wascompletely broken by dry storage or ethylene treatment and partially removedwith GA3. Norbornadiene counteracted the dormancy breaking action ofethylene and GA3. The GA3 effect was lowered bycobaltous ions. ABA increased the ethylene requirement in primary dormant seeds.Dormant seeds had a similar or different ability to produce ethylene and ACCoxidase in vivo activity than did non-dormant seeds,depending on the period of incubation. Dormant seeds contained less endogenousACC than non-dormant seeds. Thus, ethylene seems to play an essential role inthe release of primary dormancy in A. retroflexus seeds.Ethylene also participates in the release of dormancy achieved by GA3treatment. The results indicate that both ethylene biosynthesis and action isinvolved in the control of primary dormancy in Amaranthusretroflexus seeds. |
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Keywords: | 2 5-norbornadiene ABA ACC Amaranthus retroflexus Dormancy Ethylene GA3 Seed germination |
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