ISSN:
1573-5060
Keywords:
Triticum turgidum ssp. dicoccoides
;
wild emmer wheat
;
Aegilops squarrosa
;
synthethic hexaploid wheat
;
breeding common wheat
;
Triticum aestivum
;
meiosis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Novel amphiploids or synthetic hexaploid wheats, derived from eleven accessions of Triticum turgidum ssp. dicoccoides (wild emmer wheat, AABB, 2n=28) and eight accessions of Aegilops squarrosa (goat grass, DD, 2n=14) were studied. Most amphiploids were normal, vigorous and fertile. Among amphiploids a wide variation for morphological characteristics was observed. The glumes were found very tenacious and the rachis tough, or nearly so. First metaphase of meiosis proved to be quite regular; however, some aneuploid offspring occurred in successive generations. In F1 hybrids between T. aestivum (common wheat, AABBDD, 2n=42) ‘Chinese Spring’ and the synthetic hexaploids the rate of chromosome association was lower than in both parents, and significant differences were observed between amphiploids. Multivalents occurred in very low frequencies in these F1 hybrids. The rate of chromosome association in a hybrid between two synthetic hexaploids was found to be very low. The results are discussed in terms of genetic interactions and structural differences between the genomes of the respective species.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00041274
Permalink