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-102-751

[Submit comment/correction]

Reference	TAG-102-751
Title	The synaptic behaviour of Triticum turgidum with variable doses of the Ph1 locus
Journal	Theoretical and Applied Genetics
Year	2001
Volume	102
Pages	751-758
Author	Martinez M Naranjo T Cuadrado C Romero C
Abstract	Summary: Cultivated wheat Triticum turgidum is an allotetraploid (AABB) with diploid-like behaviour at metaphase I. This behaviour is mainly influenced by the action of the Ph1 locus. To study the effect of Ph1 on chromosome pairing in T. turgidum we have analysed the synaptic pattern in fully traced spread nuclei at mid- and late-zygotene and at pachytene of three different genotypes: a standard line, Ph1c mutant and a duplication mutant, with zero, two and four doses of Ph1, respectively. The number of synaptonemal complex (SC) bivalents and of the different SC multivalent associations were determined in each nucleus. The mean number of lateral elements involved in SC multivalent associations (LEm) at mid-zygotene was relatively high in all lines and was similar in two and zero doses of Ph1. These means changed little with the progression of zygotene but decreased at pachytene because of the transformation of multivalents into bivalents. Multivalent correction was more efficient in the presence than in the absence of Ph1. The four doses of Ph1 genotype showed a higher number of SC bivalents at mid-zygotene, and the frequency of multivalents decreased progressively throughout zygotene and pachytene. The results suggest that the main action of the Ph1 locus on the diploidisation mechanism would be related to a process of checking for homology operating during prophase I
External Databases	http://link.springer-ny.com/link/service/journals/00122/bibs/1102005/11020751.htm
Keyword	[ Hide all but 1 of 37 ] bivalents chiasma formation chromosome chromosome pairing complexes diploidisation duplication element frequencies genome genotype homologies homology line locus mechanism meiosis meiotic recombination metaphase mutant nuclei nucleus pachytene pairing ph1 ph1 gene ph1 locus plant science progression prophase spread synapsis synaptonemal complex synaptonemal complex-formation transformation triticum turgidum turgidum

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