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Annals of Botany 90: 287-292, 2002
© 2002 Annals of Botany Company

Programmed Cell Death during Embryogenesis in Maize

CONCETTA GIULIANI1, GABRIELLA CONSONNI2, GIUSEPPE GAVAZZI2, MONICA COLOMBO2 and SILVANA DOLFINI*,1

1 Dipartimento di Genetica e di Biologia dei microrganismi, Università degli Studi di Milano, Via Celoria 26, 20133 Milano, Italy and 2 Dipartimento di Produzione vegetale, Università degli Studi di Milano, Via Celoria 2, 20133 Milano, Italy

* For correspondence. Fax +39 02 50315044, e-mail silvana.dolfini{at}unimi.it

Received: 22 March 2002; Returned for revision: 2 May 2002; Accepted: 8 May 2002

Programmed cell death (PCD) in plants is considered an integral part of development. Evidence of DNA fragmentation, occurring at specific sites and times during embryo formation in maize (Zea mays L.), was obtained using terminal deoxyribonucleotidyl transferase-mediated dUTP-fluorescein nick end labelling (TUNEL) and by genomic DNA ladder detection. During the crucial period of elaboration of the primary shoot and root axis (14–20 d after pollination), TUNEL-positive nuclei are present in the scutellum, coleoptile, root cap and principally in the suspensor. Additional evidence of a form of programmed cell death occurring in these tissues comes from the detection of a DNA ladder. Upon completion of the differentiation process, all embryonic cells are TUNEL-negative, indicating that possible programmed cell death events during maize embryogenesis are confined to structures or organs that do not contribute to the adult plant body.

Key words: Zea mays L., maize, embryogenesis, programmed cell death, TUNEL procedure, DNA ladder.


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