Polyamine contents, ethylene synthesis, and BrACO2 expression during turnip germination |
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Authors: | M I Puga-Hermida M Gallardo M C Rodriguez-Gacio A J Matilla |
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Institution: | (1) Lab. Fisiología Vegetal, Facultade de Biología, Edificio de Ciencias Experimentales, Universidad de Vigo, E-36310 Vigo, Spain;(2) Lab. Fisiología Vegetal, Escuela Politécnica Superior, Universidad de Santiago de Compostela, E-15782 Santiago de Compostela, Spain;(3) Lab. Fisiología Vegetal, Facultade de Farmacia, Universidad de Santiago de Compostela, E-15782 Santiago de Compostela, Spain |
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Abstract: | Contents of total free PA(S)] and conjugated polyamines PA(SH), PA(PH)] were higher in turnip (Brassica rapa L. cv. Rapa) seeds during imbibition (0–36 h) and radicle protrusion (36–48 h) than during the further growth (10 d). Ethylene
production was activated with the protrusion, reaching a maximum at the second day of germination and dropping afterwards.
The application of ethrel accelerated radicle emergence but the direct intervention of ethylene in the breaking of the seed
coat was not clear from the use of ethylene-biosynthesis inhibitors (CoCl2 and AVG). Finally, in this work the gene BrACO2 was characterized. Although its expression was not detected in seeds through zygotic embryogenesis, it increased concomitantly
with the germination process. |
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Keywords: | Brassica rapa Cruciferae conjugated polyamines ethrel free polyamines seed |
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