Query (optional)   in Class  All Allele Author Colleague Collection Assembly Gene Gene Class Gene Product Germplasm Image Journal Keyword Library Locus Map Map Data Marker Pathology Polymorphism Probe Protein QTL Rearrangement Reference Sequence Species Trait Trait Study Two Point Data  

---

GrainGenes Reference Report: GNM-38-307

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	[ Hide all but 1 of 17 ] afghanistan b-chromosomes chromosome-analysis chromosome-morphology chromosome-pairing cultivar cytogenetics hybrids interspecific-hybridization iran japan korea-republic secale secale cereale secale-segetale turkey wild-plants

GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.