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GrainGenes Reference Report: GNM-38-307

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Reference	GNM-38-307
Title	Origin of B chromosomes in cultivated rye
Journal	Genome
Year	1995
Volume	38
Pages	307-312
Author	Niwa K Sakamoto S
Abstract	Cultivated rye (Secale cereale) and its weedy relative (S segetale) carry B chromosomes The B chromosomes are known to be morphologically alike at somatic metaphase and they are of the standard type in natural populations To clarify the cytogenetic relationship between the standard B chromosomes of S cereale and those of S segetale, we made four crosses between Afghan S. segetale with two standard B chromosomes as a pistillate parent and Turkish, Iranian, Korean, and Japanese S. cereale, all with two standard B chromosomes as pollen parents. We observed the pairing of B chromosomes at diakinesis in pollen mother cells in all F1 hybrids with four standard B chromosomes, two from each of the pistillate and the pollen parents. The degree of pairing of B chromosomes in all F1 hybrids with four standard B chromosomes was similar to or somewhat lower than, that in parental strains with four standard B chromosomes. These results showed that the standard B chromosomes in S. segetale from Afghanistan are homologous with those in S. cereale from Turkey, Iran, Korea, and Japan. We therefore propose monophyletic origin of the standard B chromosomes in S. segetale and S. cereale.
Keyword	afghanistan [ Show all 17 ]

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