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AOBPreview originally published online on June 26, 2003
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Annals of Botany 92: 281-288, 2003
© 2003 Annals of Botany Company

New CMS-associated Phenotypes in Cybrids Nicotiana tabacum L. (+Hyoscyamus niger L.)

MIKHAJLO K. ZUBKO*,1,2, ELENA I. ZUBKO1, KLAUS ADLER2, BERNHARD GRIMM2 and YURI YU. GLEBA1

1 International Institute of Cell Biology, Zabolotnogo Str. 148, 252143 Kiev-143, Ukraine and 2 Institut für Pflanzengenetik und Kulturpflanzenforschung Gatersleben, IPK Corrensstrasse 3, 06466 Gatersleben, Germany

* For correspondence. E-mail mikhajlo.zubko{at}man.ac.uk

Received: 28 February 2003; Returned for revision: 11 April 2003; Accepted: 6 May 2003    Published electronically: 26 June 2003

Morphological characteristics were studied in cytoplasmic male sterile (CMS) cybrids possessing the tobacco nuclear genome, Hyoscyamus niger plastome and recombinant mitochondria. After backcrosses with tobacco, new flower modifications were found, including: conversions of stamens into branched filamentous structures; alterations in the shape of petals and the corolla limb; and high degrees of reduction in most flower organs. Vegetative alterations (leaf elongation and stem branching) occurred in some cybrids. Results confirmed that a protoplast fusion-based alloplasmic cytoplasm transfer, followed by conventional backcrosses, is a useful tool for generating alternative CMS sources with novel nucleo-cytoplasmic compositions. These alterations in the genetic status were accompanied by modified floral and vegetative phenotypes.

Key words: Nicotiana, Hyoscyamus, cybrids, CMS flowers, leaf development, nucleo-cytoplasmic incompatibility.


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