期刊
GENES & GENETIC SYSTEMS
卷 87, 期 1, 页码 1-7出版社
GENETICS SOC JAPAN
DOI: 10.1266/ggs.87.1
关键词
homoeologous pairing; Ph1; B chromosome; rye; common wheat
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan [23658009]
- Grants-in-Aid for Scientific Research [23658009] Funding Source: KAKEN
Rye B chromosomes, which are supernumerary chromosomes dispensable for the host but increase in number by non-disjunction after meiosis, have been reported to affect meiotic homoeologous pairing in wheat-rye hybrids. The effect of a rye B chromosome (B) and its segments (B-9 and B-10) on homoeologous pairing was studied in hybrids between common wheat (2n = 42) and Aegilops variabilis (2n = 28), with reference to the Phi gene located on wheat chromosome 5B. The B-9 and B-10 chromosomes are derived from reciprocal translocations between a wheat and the B chromosomes, and the former had the B pericentromeric segment and the latter had the B distal segment. Both the B and B-9 chromosomes suppressed homoeologous pairing when chromosome 5B was absent. On the other hand, the B-9 and B-10 chromosomes promoted homoeologous pairing when 5B was present. On pairing suppression, B-9 had a greater effect in one dose than in two doses, and B-9 had a greater effect than B-10 had in one dose. These results suggested that the effect of the B chromosomes on homoeologous pairing was not confined to a specific region and that the intensity of the effect varied depending on the presence or absence of 5B and also on the segment and dose of the B chromosome. The mean chiasma frequency (10.23) in a hybrid (2n = 36) possessing 5B and one B-9 was considerably higher than that (2.78) of a hybrid (2n = 35) possessing 5B alone, and was comparable with that (14.09) of a hybrid (2n = 34) lacking 5B. This fact suggested that the B chromosome or its segment can be used in introducing alien genes into wheat by inducing homoeologous pairing between wheat and alien chromosome.
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