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AOBPreview published online on June 26, 2003
Annals of Botany, doi:10.1093/aob/mcg135
© 2003 by Annals of Botany Company
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Submitted on February 28, 2003
Revised on April 11, 2003
Accepted on May 6, 2003

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

MIKHAJLO K. ZUBKO1*, ELENA I. ZUBKO2, KLAUS ADLER3, BERNHARD GRIMM3, and YURI YU. GLEBA2

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

* To whom correspondence should be addressed. E-mail: mikhajlo.zubko{at}man.ac.uk.

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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