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Wheat Information Service
Number 80: 32 - 36 (1995)


Partial amphiploids from Triticum durum x Elytrigia intermedia and T.durum x tetraploid Elytrigia elongata

Han Fang-Pu and Li ji-Lin

Department of Biology, Harbin Normal University, Harbin, 150080, China


Summary

Stable hexaploid x Trititrigia lines were obtained from the derivatives of two crosses, i.e. (Triticum durum x x Elytrigia intermedia) x T.durum and (T.durum x E.elongata 4x) x T.durum. The number of chromosomes in the root-tip cells was 42 and that of bivalents at metaphage I in PMC was 2 1. The hexaploid x Trititrigia from E.intermedia might involve three types of genomic constitution (AABBXX, AABBE1E1 and AABBE2E2), whereas that from tetraploid E. elongata might involve two types (AABBE1E1 and AABBE2E2).


Introduction

The wild relatives of wheat have been considered as a useful reservoir of agronomic genes in wheat breeding. One underutilized genetic source is the genus Elytrigia (Schulz-Schaeffer and Haller 1988).

Wild species of the genus Elytrigia is an important source for improving the agronomic characteristics of wheat. Among the possible genetic sources are for resistance to wheat streak mosaic virus and barley yellow dwarf virus, resistance to rust and tolerance to salt stress (Friebe et al. 1992). Agroromic characteristics of Elytrigia including cold, salt, drought, pest and disease resistance could be transferred into wheat. Amphiploids were obtained by chromosome doubling of F1 hybrids. Another kind of amphiploid from wheat-Elytrigia crosses was recovered in the backcross derivatives (Sharma et al. 1987). Cauderon (1977) backcrossed T.aestivum x E. intermedia F1 twice with wheat and, through the selection for fertility obtained a partial amphiploid with three genomes of common wheat and one genome of E.intermedia. In order to produce hexaploid x Trititrigia, we made crosses and backcrosses between T.durum and E.intermedia and between T.durum and tetraploid E.elongata. Chromosome pairings of the hybrids in F1 and BC1F1 plants were studied. In this article, the new production of hexaploid x Trititrigia is reported.

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