scholarly journals Recurrent hybridization without homoeologous chromosome paring in the Dryopteris varia complex (Dryopteridaceae)

2018 ◽  
Vol 13 (1) ◽  
pp. 9-24 ◽  
Author(s):  
Kiyotaka Hori ◽  
Yudai Okuyama ◽  
Yasuyuki Watano ◽  
Noriaki Murakami
Keyword(s):  
Homoeologous Chromosome

scholarly journals Seventy Million Years of Concerted Evolution of a Homoeologous Chromosome Pair, in Parallel, in Major Poaceae Lineages

2011 ◽  
Vol 23 (1) ◽  
pp. 27-37 ◽  
Author(s):  
Xiyin Wang ◽  
Haibao Tang ◽  
Andrew H. Paterson
Keyword(s):  
Concerted Evolution ◽  
Chromosome Pair ◽  
Homoeologous Chromosome

A WHEAT MUTATION CONDITIONING AN INTERMEDIATE LEVEL OF HOMOEOLOGOUS CHROMOSOME PAIRING

1982 ◽  
Vol 24 (6) ◽  
pp. 715-719 ◽  
Author(s):  
E. R. Sears
Keyword(s):  
Chromosome Pairing ◽  
Triticum Aestivum L ◽  
Terminal Segment ◽  
Intermediate Level ◽  
Homoeologous Pairing ◽  
Homoeologous Chromosome ◽  
X Ray ◽  
Homoeologous Chromosome Pairing ◽  
Homozygous Line ◽  
A Minor

An X-ray-induced mutation in common wheat (Triticum aestivum L.), designated ph2, conditions an intermediate level of homoeologous chromosome pairing in hybrids with Triticum kotschyi var. variabilis. The number of chromosomes paired averaged 9.2 per sporocyte, compared with 2.0 in the control and 27.9 in the same hybrid involving ph1b, an apparent deficiency for Ph1 obtained in the same mutation experiment. The ph2 mutation is located on chromosome 3D and is believed to be a deficiency for a terminal segment of the short arm that includes the locus of Ph2, a minor suppressor of homoeologous pairing. Although no pairing of the ph2-carrying chromosome with telosome 3DS was observed, the mutation is clearly not a deficiency for the entire arm. It has little effect on pairing in wheat itself. Male transmission of the mutation is approximately normal, and fertility, while reduced, is sufficient for easy maintenance of the homozygous line.

A superfamily of disease resistance gene analogs is located on all homoeologous chromosome groups of wheat (Triticum aestivum)

Genome ◽  
1998 ◽  
Vol 41 (6) ◽  
pp. 782-788 ◽  
Author(s):  
W Spielmeyer ◽  
M Robertson ◽  
N Collins ◽  
D Leister ◽  
P Schulze-Lefert ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Binding Site ◽  
Resistance Gene ◽  
Resistance Genes ◽  
Nucleotide Binding ◽  
Nucleotide Binding Site ◽  
Resistance Gene Analogs ◽  
Leucine Rich Repeat ◽  
Homoeologous Chromosome ◽  
Entry Points

In this study, resistance gene analogs (RGAs) which were isolated from monocot crop species (wheat, barley, maize and rice) and contained conserved sequence motifs found within the nucleotide binding site - leucine rich repeat (NBS-LRR) class of resistance genes, were used to assess their distribution in the wheat genome. The RGAs showed 30-70% amino acid identity to a previously isolated monocot NBS-LRR sequence from the Cre3 locus for cereal cyst nematode (CCN) resistance in wheat. We used the RGAs as probes to identify and map loci in wheat using recombinant inbred lines of an international Triticeae mapping family. RGA loci mapped across all seven homoeologous chromosome groups of wheat. This study demonstrated that the RGA mapping approach provides potential entry points toward identifying resistance gene candidates in wheat.Key words: wheat, disease resistance genes, nucleotide binding site, leucine rich repeat, resistance gene analogs.

A superfamily of disease resistance gene analogs is located on all homoeologous chromosome groups of wheat (Triticum aestivum)

Genome ◽  
1998 ◽  
Vol 41 (6) ◽  
pp. 782-788 ◽  
Author(s):  
W. Spielmeyer ◽  
M. Robertson ◽  
N. Collins ◽  
D. Leister ◽  
P. Schulze-Lefert ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Disease Resistance ◽  
Resistance Gene ◽  
Disease Resistance Gene ◽  
Resistance Gene Analogs ◽  
Homoeologous Chromosome

Homoeologous chromosome pairing across the eukaryote phylogeny

2017 ◽  
Vol 117 ◽  
pp. 83-94 ◽  
Author(s):  
Amanda L. Grusz ◽  
Erin M. Sigel ◽  
Colby Witherup
Keyword(s):  
Chromosome Pairing ◽  
Homoeologous Chromosome ◽  
Homoeologous Chromosome Pairing

EFFECT OF RYE ON HOMOEOLOGOUS CHROMOSOME PAIRING IN WHEAT × RYE HYBRIDS

1977 ◽  
Vol 19 (3) ◽  
pp. 549-556 ◽  
Author(s):  
J. Dvořák
Keyword(s):  
Triticum Aestivum ◽  
Chromosome Pairing ◽  
Chinese Spring ◽  
Triticum Aestivum L ◽  
Homoeologous Chromosome ◽  
Wheat Genotype ◽  
Hybrid Plants ◽  
Homoeologous Chromosome Pairing ◽  
Secale Cereale L ◽  
Polygenic System

The number of chiasmata per cell at metaphase I was scored in eight haploid plants of Triticum aestivum L. emend. Thell. cv. 'Chinese Spring' and 100 hybrid plants of Chinese Spring × Secale cereale L. Mean chiasma frequency per cell ranged from 0.00 to 3.59 in the hybrids and from 0.17 to 0.35 in the haploids. Since the same wheat genotype was present in both the haploids and hybrids, it is concluded that some of the rye genotypes promoted homoeologous chromosome pairing. The absence of distinct segregation classes among the hybrids suggests that these genes constitute a polygenic system.

Genetic load and long-distance dispersal in Asplenium platyneuron

1983 ◽  
Vol 61 (6) ◽  
pp. 1809-1814 ◽  
Author(s):  
Kathryn Carvey Crist ◽  
Donald R. Farrar
Keyword(s):  
Chromosome Pairing ◽  
Second Generation ◽  
Genetic Load ◽  
Long Distance Dispersal ◽  
Homoeologous Chromosome ◽  
Spore Dispersal ◽  
Long Distance ◽  
Homoeologous Chromosome Pairing ◽  
Self Fertilization ◽  
Sporophyte Production

Solitary plants of Asplenium platyneuron occur disjunctively on recently produced coal spoils in southern Iowa. They are assumed to have been produced by self-fertilization of isolated gametophytes and therefore highly homozygous. Cultures of isolated and paired gametophytes originating from these solitary sporophytes produced second-generation sporophytes with 89 and 93% success, respectively, indicating a low genetic load as expected. The failure of gametophytes from coal-spoil plants to produce sporophytes with even greater success may result from homoeologous chromosome pairing and recombination at meiosis which allows production of variable spores and expression of genetic load from plants produced by self-fertilization of single gametophytes. Cultures of isolated and paired gametophytes originating from sporophytes in populations central to the species' range produced second-generation sporophytes with 83 and 90% success, respectively, indicating a significantly greater genetic load in populations but still a relatively low genetic load for the species. Through low genetic load, regularity of sporophyte production from isolated gametophytes, and ability of such plants to release variability through homoeologous chromosome pairing, Asplenium platyneuron is remarkably adapted for, and successful in, colonizing distant habitats through long-range spore dispersal.

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