, Volume 58, Issue 1, pp 81-95

First online:

Production and cytogenetic analysis of the intergeneric hybrids between nine Elymus species and common wheat (Triticum aestivum L.)

  • Bao-Rong LuAffiliated withDepartment of Crop Genetics and Breeding, The Swedish University of Agricultural Sciences
  • , Roland von BothmerAffiliated withDepartment of Crop Genetics and Breeding, The Swedish University of Agricultural Sciences

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Intergeneric hybridizations were performed between Triticum aestivum L. (2n=6x=42, AABBDD) and twelve Elymus species, ten tetraploids (2n=4x=28, SSYY) and two hexaploids (2n=6x=42, SSHHYY and SSYY??), namely, E. pendulinus (Nevski) Tzvelev, E. altissimus (Keng), Löve, E. anthosachnoides (Keng) Löve, E. brevipes (Keng) Löve, E. dolichatherus (Keng) Löve, E. parviglumis (Keng) Löve, E. pseudonutans (Keng) Löve, E. tibeticus (Melderis) G. Singh, E. semicostatus (Nees ex Steud.) Melderis, E. caucasicus (C. Koch) Tzvelev (tetraploids), and E. tsukushiensis Honda and E. tschimganicus (Drobov) Tzvelev (hexaploids). The hybrid seed sets in different combinations varied from 4.8%–72.2%, and embryo yields ranged from 3.2%–36.7%. Nine combinations produced adult hybrid plants, eight pentaploids and one hexaploid, through embryo rescue. The production of hybrid plants varied from 1.2%–30%. Chromosome pairing was analysed at metaphase I in the parental species and the hybrids. Average meiotic configurations of 33.51 I+0.74 II+0.03 III+0.001 IV were observed amongst the pentaploid hybrids although there was a large variation, and 31.42 I+5.21 II+0.04 III was recorded in the hexaploid hybrid. It is concluded from the study that: 1) very little pairing occurred between the ABD genomes in T. aestivum and the different genomes in the tetraploid Elymus species. even though the pairing behaviour varied in different combinations; 2) the hexaploid combination had distinctly higher chromosome pairing than the other pentaploid combinations, which could be due either to a low degree of homoeology between the T. aestivum and E. tschimganicus genomes or that the latter species contains, certain gene(s) which increase the meiotic pairing between genomes from the same parental species.

Key words

Elymus species genome germplasm resources intergeneric hybridization meiosis Triticum aestivum wheat