Aspetti cellulari, fisiologici e molecolari della senescenza nelle piante

Mirko Siragusa [CNR Istituto di Genetica Vegetale, Corso Calatafimi 414, 90128 Palermo, Italy]
Roberto De Michele [Dipartimento di Biologia, Università di Padova, via U. Bassi 58/B, 35131 Padova, Italy]
Angela Carra [CNR Istituto di Genetica Vegetale, Corso Calatafimi 414, 90128 Palermo, Italy]
Francesco Carimi [CNR Istituto di Genetica Vegetale, Corso Calatafimi 414, 90128 Palermo, Italy]

Senescence is the final stage of development of an organ; in a leaf, this syndrome is characterized by a gradual yellowing, loss of protein content and change in the metabolism, which eventually lead to death. It is generally a slow degenerative process during which nutrients are mobilized and translocated to other parts of the plant. Senescence is under control of environmental and endogenous factors. In general, cytokinins produce a delay in leaf senescence and their levels have been observed to decline in senescing leaf tissues. In contrast, ethylene and abscissic acid can accelerate the onset of senescence. The study of plant senescence may help to clarify numerous general aspects of organ development and contribute to better understanding programmed cell death. Herein, we specifically explore senescence and its regulation.

Keywords: Nitril oxide, plant growth regulators, programmed cell death, senescence

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Siragusa, M., De Michele, R., Carra, A. and Carimi, F. (2006) 'Aspetti cellulari, fisiologici e molecolari della senescenza nelle piante', Italus Hortus, 13(4), pp. 74-83.