1コムギ品種Chinese springにおける1染色体性の伝達〔英文〕-2-
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概要
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Frequencies of monosomics in progenies from self- or cross-pollinated monosomics of a common wheat variety, Chinese Spring, were estimated from the data accumulated during nine years in U. S. A., Canada and Japan. Analysis has been made of several factors. which might be concerned with the frequency of monosomics. The results are summarized as follows:1. Contrary to the expectation, over-all frequency of monosomics in self-pollinated progenies was lower than in cross-pollinated ones. This tendency was most pronounced in monosomics of homoeologous group 1. Poorer viability of monosomic embryos of pure monosomic lines than that of hybrids was assumed to be the cause.2. In general, frequencies of monosomics observed in America and Japan were the same. However, mono-5A showed an extremely high transmission rate of monosomic condition in Japan.3. The monosomic frequency significantly differed among 21 monosomic lines. Mono-6B showed the lowest frequency (57.3%) and mono-5A the highest (81.9%). Frequencies of the other monosomics were intermediate.4. Monosomics belonging to the same homoeologous group showed in general similar frequencies. Homoeologous group 1 (79.5% except mono-1B), 6 (77.8% except mono-6B) and 3 (76.3%) are characterized by high and group 2 (67.1%) by low transmission rate. The other three groups had an intermediate frequency.5. Three monosomics showed a deviation in the frequency from those of the two other monosomics belonging to the same homoeologous group. The frequencies of mono-1B and -6B were low and that of mono-5A was high. Low frequencies of the former two are probably correlated to the localization of the nucleolus-organizing region on chromosomes 1B and 6B. High frequency of mono-5A might be related to the speltoid character, for which chromosome 5A is responsible.6. High correlation was found between the frequency of monosomics and both seed-setting percentage and germination rate. No correlation was detected between the former and either chromosome length, frequency of pollen tetrads with micronuclei or frequency of chromosome-deficient male gametes. This result indicates that the transmission rate of monosomic condition is mainly determined by the viability of monosomic embryos.
- 日本遺伝学会の論文