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: TAG-89-599

[Submit comment/correction]

Reference	TAG-89-599
Title	Hybrids and backcross progenies between wheat (Triticum aestivum L.) and apomictic Australian wheatgrass [Elymus rectisetus (Nees in Lehm.) A. Love & Connor]: karyotypic and genomic analyses
Journal	Theoretical and Applied Genetics
Year	1994
Volume	89
Pages	599-605
Author	Liu Z (2) Wang R Carman J
Abstract	Wheat (Triticum aestivum L., 2n = 6x = 42, AABBDD) florets were emasculated and pollinated using two apomictic wheatgrass [Elymus rectisetus (Nees in Lehm. A Love & Connor, 2n = 6x = 42, SSYYWW] accessions, one of which produces 2n pollen A 2n = 42 (BII) hybrid and four 2n = 63 (BIII) hybrids were obtained The spike morphology of the BII hybrid was intermediate to that of its parents The pollen mother cells (PMCs) of this hybrid contained on average 38.36 I and 1.62 II, which was consistent with its disparate genome composition (ABDSYW). Its pollen failed to stain and no BC1 progeny was obtained. The BIII hybrids (reduced egg fertilized with unreduced sperm) were grasslike and had a full complement of E. rectisetus chromosomes, the synapsis of which was slightly impaired by wheat haplome and/or cytoplasm. Their PMCs contained on average 16.30 II, 25.72 I, and 1.54 multivalents (III plus IV). Pollen stainability in these hybrids was low (< 1%). and when they were used as females, one 54- and 60-chromosome BC1 were obtained. A mean of 13.25 II was observed in PMCs of the 54-chromosome BC, and pollen stainability was 10%. Pollen stainability in the 60-chromosome BC1 was only 5%. The use of 2n-pollen-producing E. rectisetus accession accelerated hybrid and BC1 formation and may accelerate the ultimate transfer of apomixis to wheat.
Keyword	[ Hide all but 1 of 17 ] apomixis backcross backcrossing chromosome-number chromosome-pairing cytogenetics elymus genome-analysis hybrids intergeneric-hybridization karyotype male-fertility meiosis pollen staining triticum aestivum wide-hybridization

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