A chromosome-specific sequence common to the B genome of polyploid wheat and Aegilops searsii |
| |
Authors: | B. Liu G. Segal J. K. Rong M. Feldman |
| |
Affiliation: | (1) Institute of Genetics and Cytology, Northeast Normal University, Changchum, 130024, China;(2) Waksman Institute of Microbiology, Rutgers, The State University of New Jersey, 190 Frelington Road, Piscataway, NJ 08854-8020, USA;(3) Center for Applied Genetic Technologies, University of Georgia, Athens, GA 30602, USA;(4) Department of Plant Sciences, The Weizmann Institute of Science, Rehovot, 76100, Israel |
| |
Abstract: | A low-copy, non-coding chromosome-specific DNA sequence, isolated from common wheat, was physically mapped to the distal 19% region of the long arm of chromosome 3B (3BL) of common wheat. This sequence, designated WPG118, was then characterized by Southern hybridization, PCR amplification and sequence comparison using a large collection of polyploid wheats and diploid Triticum and Aegilops species. The data show that the sequence exists in all polyploid wheats containing the B genome and absent from those containing the G genome. At the diploid level, it exists only in Ae. searsii, a diploid species of section Sitopsis, and not in other diploids including Ae. speltoides, the closest extant relative to the donor of the B genome of polyploid wheat. This finding may support the hypothesis that the B-genome of polyploid wheat is of a polyphyletic origin, i.e. it is a recombined genome derived from two or more diploid Aegilops species. |
| |
Keywords: | Aegilops searsii B-genome origin chromosome-specific sequences introgression recombined genome polyploid wheat Triticum turgidum T. aestivum T. timopheevii. |
本文献已被 SpringerLink 等数据库收录! |
|