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Discussion
K. gobicola and K. zhaosuensis are new species
which were found in west China in recent years. Their genomes were
not analysed. Their karyotypes showed that they possess a set of long
chromosomes, which can be distinguished clearly from H, S, and Y
genomes. The fourth and sixth chromosomes of karyotypes were
satellite chromosomes which were similiar to those of P genome of
Agropyron (Yen et al. 1989, 1990). According to the karyotypes, Yen
and J. L. Yang (1989, 1990) infer that K. gobicola and K.
zhaosuensis have the P genome and two sets of other genomes.
R. tsukushiensis has the S, H and Y genomes (Sakamoto 1964,
Dewey 1984, Lu et al. 1990). The frequencies of 11.56 and 11.73
bivalents per cell were found in the hybrids of K. gobicola
and K. zhaosuensis crossed with R. tsukushiensis
respectively. The results indicated that K. gobicola and K.
zhaosuensis share two sets of genomes of R. tsukushiensis
and the two genomes of K. gobicola and K.
zhaosuensis have
high homology with the two genomes of R. tsukushiensis.
Chromosome bridges at anaphase I and II were found in meiosis of
K.
zhaosuensis x R. tsukushiensis. It showed that
paracentric inversion probably occurred between the genomes of K.
zhaosuensis and R. tsukushiensis.
Reference
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Lu BR, Yen C and Yang JL (1990) Cytological and morphological studies
of Agropyron
tsukushiense var. transiens of Japan, Roegneria kamoji
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Yang JL, Yen C and Baum BR (1992) Kengyilia: synopsis and key
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Yen C and Yang JL (1990) Kengyilia gobicola, a new taxon from
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