Comparative RFLP mapping of Triticum monococcum genes controlling vernalization requirement |
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Authors: | J Dubcovsky D Lijavetzky L Appendino G Tranquilli |
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Institution: | (1) Department of Agronomy and Range Science, University of California, Davis, CA 95616-8515, California, USA, US;(2) Facultad de Agronomía UBA, Av. San Martín 4453, (1417) Buenos Aires, Argentina, AR;(3) Instituto de Recursos Biológicos, INTA, Villa Udaondo, (1712) Castelar, Buenos Aires, Argentina, AR |
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Abstract: | The adaptability of Triticum aestivum to a large range of environments is partially due to genetic differences in sensitivity to vernalization. The most potent
gene reducing the vernalization requirement in hexaploid wheat is Vrn-A1. An orthologous vernalization gene, designated Vrn-A
m
1, was mapped in the diploid wheat Triticum monococcum between RFLP markers Xwg908 and Xabg702 on the long arm of chromosome 5AmL. The orthology of VrnA
m
1 with Vrn-A1 (5A wheat, originally Vrn1), Vrn-D1 (5D wheat, originally Vrn3), Vrn-R1 (5R rye, originally Sp1) and Vrn-H1 (5H barley, originally Sh2) was shown by mapping RFLP markers linked to these vernalization genes on the T. monococcum linkage map. A second vernalization gene, designated Vrn-A
m
2, was found in the distal region of chromosome 5AmL within a segment translocated from homoeologous group 4. This gene is completely linked to RFLP marker Xbcd402 and located between the same RFLP markers (Xβ-Amy-1 and Xmwg616) as the Vrn-H2 (originally Sh) locus in Hordeum vulgare.
Received: 6 January 1998 / Accepted: 31 March 1998 |
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Keywords: | Triticum monococcum Vernalization genes Vrn-1 Vrn-2 RFLP Comparative maps |
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