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Discussion
Overall, polymorphic variation of C-bands is prevalent on
chromosome arms 1DL, 2DS, 2DL, 3DL, 5DS, 5DL and 7DL, which are
similar to those reported by Friebe et al. (1992) and Hohmann et al.
(1993). However, in the present study a large amount of polymorphism
of chromosome arm 5DS and a few polymorphisms on 6DL were found,
which is different from their reports. The results of comparison of
the C-banding pattern of T. tauschii accessions from Middle
East (including the varieties typica, meyeri and
strangulata) reported by Hohmann et al. (1993) with that of
Chinese T. tauschii, indicates that the nine Chinese T.
tauschii from the middle reaches of the Yellow River are more
similar to the variety typica, although some variation was
found. The two accessions from Xinjiang are different from all the
three varieties.
Compared with the polymorphic variation between the accessions from
the middle reaches of the Yellow River and the accessions from
Xinjiang, which shows a large amount of polymorphic variation, there
is less variation between the nine T. tauschii from the middle
reaches of Yellow river or between the two accessions from Xinjiang.
The result is consistent with the evidence of esterase and RFLPs
analysis in Chinese T. tauschii (Yen et al. 1983; Ward et al.
1995). The differences of C-band polymorphism between the accessions
from the middle reaches of the Yellow River and the accessions from
Xinjiang are significant in chromosome arms 1DL, 3DS, 5DS and
5DL.
Though the C-banding pattern of T. tauschii chromosome is
similar to that of homologues of Chinese Spring, there are some
differences. Modification of C-banding pattern indicates
differentiation in the D-genome chromosomes between T. tauschii
and Chinese Spring (Friebe et al; 1992, Hobmann et al. 1993).
References
Friebe B, Mukai Y and Gill BS (1992) C-bandig polymorphisms in
several aeccessions of Triticum tauschii (Aegilops squarrosa).
Genome 35: 192-199.
Gill BS, Friebe B and Endo TR (1991) Standard karyotype and
nomenclature system for description of chromosome bands and
structural aberrations in wheat (Triticum aestivum). Genome
34: 830-839.
Hohmann U and Lagudah ES (1993) C-bandig polymorphism and linkage of
nonhomeologous RFLP loci in the D genome progenitor of wheat. Genome
36: 235-243.
Ren ZL and Zhang HQ (1995) A improved C-bandig technique for plant. J
Sichuan Agric Univ 13: 1-5.
Ward RW, Yang ZL, Yen C and Kim HS RFLP-based genetic diversity in
Chinese landraceas of Ae. tauschii and T. aestivum.
(unpublished).
Yen C, Yang JL, Liu XD and Li LR (1983) The distribution of
Aegilops tauschii Cosson in China and with reference to the
origin of the Chinese common wheat. Proc 6th Intern Wheat Genet Symp,
Kyoto Japan : 55-58.
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