Genetic analysis of the species cytoplasm specific gene (scsd) derived from durum wheat

S. B. Gehlhar, K. J. Simons, S. S. Maan, S. F. Kianian

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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. (scs ti) 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 scs ti 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.

Original languageEnglish (US)
Pages (from-to)404-409
Number of pages6
JournalJournal of Heredity
Issue number4
StatePublished - Jul 2005
Externally publishedYes

Bibliographical note

Funding Information:
We thank Justin B. Hegstad, Kay M. Carlson, and the rest of the Wheat Germplasm Enhancement group for their assistance in making this article possible. We also thank Drs. Christoffers and Cai for their suggestions in improving this manuscript, and Dr. R. L. Phillips for helpful discussion and suggestions on bt-1m blistering phenotype of maize. This material is based on the work supported by the USDA-IFAFS grant no. 2001-52100-11293, NSF-PGRP contract agreement no. DBI-9975989, and the North Dakota Wheat Commission to S.F.K.


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