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Journal of Heredity Advance Access published online on April 20, 2005
Journal of Heredity, doi:10.1093/jhered/esi054
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© The American Genetic Association. 2005. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org.
Received May 14, 2004
Accepted January 31, 2005

Article

Genetic Analysis of the Species Cytoplasm Specific Gene (scsd) Derived from Durum Wheat

Sarah B. Gehlhar 1, Kristin J. Simons 1, Schivcharan S. Maan 1, and Shahryar F. Kianian 1*

1 From the Department of Plant Sciences, 470G Loftsgard Hall, North Dakota State University, Fargo, ND 58105

* To whom correspondence should be addressed.
Shahryar F. Kianian, E-mail: s.kianian{at}ndsu.edu


  Abstract

The action of species cytoplasm specific (scs) gene(s) can be observed when a durum (Triticum turgidum L.) nucleus is placed in the Aegilops longissimum S. & M. cytoplasm. This alloplasmic combination, (lo) durum, results in nonviable progeny. A scs gene derived from T. timopheevii Zhuk. (scsti) produced compatibility with the (lo) cytoplasm. The resulting hemizygous (lo) scsti- durum line was male sterile and when crossed to normal durum produced a 1:1 ratio of plump, viable (PV) seeds with scsti and shriveled inviable (SIV) seeds without scsti. In a systematic characterization of durum lines an unusual line was identified that when crossed to (lo) scsti- produced all PV seeds. When planted these PV seeds segregated at a 1:1 ratio of normal vigor plants (NVPs) and low vigor plants (LVPs). The LVP senescence before full maturity. The NVPs were male sterile and when crossed to common durum lines resulted in all plump seeds that again segregated at a 1:1 ratio of NVPs to LVPs. The crosses of these NVPs to common durum lines resulted in a 1:1 ratio of PV to SIV seeds. This study was extended to 317 individuals segregating for scsti and the new locus, derived from durum wheat (scsd), establishing the allelic relationship of these two genes.


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