Activities of nucleases in senescing daylily petals |
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| Institution: | 1. Department of Biology, University of Massachusetts, Amherst, MA 01003-5810, USA;2. Plant Biology Graduate Program, University of Massachusetts, Amherst, MA 01003-5810, USA;3. Department of Biological Sciences, Smith College, Northampton, MA 01063, USA;1. Dipartimento di Scienze della Vita, Università di Siena, Siena 53100, Italy;2. Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università degli Studi di Bologna, Bologna 40126, Italy;3. Dipartimento di Biologia Ambientale, Sapienza Università di Roma, I-00185, Italy;1. Department of VehicleEngineering The School of Mechanical and Power Engineering Henan Polytechnic University, Jiaozuo 454003, China;2. Department of Engineering and Design The School of Engineering and Informatics The University of Sussex, Falmer, Brighton BN1 9QT, UK |
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| Abstract: | The activity of nucleases during organ death was investigated using daylily petals (Hemerocallis hybrid cv. Stella d’Oro), in which the processes associated with senescence are rapid and clearly ordered. The number of nuclei with fragmented DNA as well as activities of various nucleases increase before certain other events that are related to senescence. Furthermore, DNA breakage and activities of nucleases occur earlier when senescence is accelerated by abscisic acid and occur later when senescence is retarded by cycloheximide. These results suggest that the activities of nucleases contribute to the senescence of daylily petals. Therefore, studying the regulation of nuclease gene expression may be useful for understanding components of the signal transduction system that leads to the death of these organs. |
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