Comparative Mapping of the Barley Ppd-H1 Photoperiod Response Gene Region, Which Lies Close to a Junction Between Two Rice Linkage Segments

Genetics ◽  
2002 ◽  
Vol 161 (2) ◽  
pp. 825-834
Author(s):  
Roy P Dunford ◽  
Masahiro Yano ◽  
Nori Kurata ◽  
Takuji Sasaki ◽  
Gordon Huestis ◽  
...  
Keyword(s):  
Comparative Mapping ◽  
Distal Part ◽  
Heading Date ◽  
Rice Chromosome ◽  
Photoperiod Response ◽  
Rflp Markers ◽  
Response Gene ◽  
The Relationship ◽  
Equivalent Region ◽  
Search For Homologs

Abstract Comparative mapping of cereals has shown that chromosomes of barley, wheat, and maize can be described in terms of rice “linkage segments.” However, little is known about marker order in the junctions between linkage blocks or whether this will impair comparative analysis of major genes that lie in such regions. We used genetic and physical mapping to investigate the relationship between the distal part of rice chromosome 7L, which contains the Hd2 heading date gene, and the region of barley chromosome 2HS containing the Ppd-H1 photoperiod response gene, which lies near the junction between rice 7 and rice 4 linkage segments. RFLP markers were mapped in maize to identify regions that might contain Hd2 or Ppd-H1 orthologs. Rice provided useful markers for the Ppd-H1 region but comparative mapping was complicated by loss of colinearity and sequence duplications that predated the divergence of rice, maize, and barley. The sequences of cDNA markers were used to search for homologs in the Arabidopsis genome. Homologous sequences were found for 13 out of 16 markers but they were dispersed in Arabidopsis and did not identify any candidate equivalent region. The implications of the results for comparative trait mapping in junction regions are discussed.

Apomixis in Tripsacum: Comparative mapping of a multigene phenomenon

Genome ◽  
2001 ◽  
Vol 44 (2) ◽  
pp. 222-230 ◽  
Author(s):  
C A Blakey ◽  
S L Goldman ◽  
C L Dewald
Keyword(s):  
Comparative Mapping ◽  
Seed Set ◽  
Fragment Length Polymorphism ◽  
Grass Species ◽  
Rflp Markers ◽  
Tripsacum Dactyloides ◽  
Maize Chromosome ◽  
Mother Cells ◽  
The Relationship ◽  
Group D

A relationship has been established between the expression of apomixis in natural polyploids of Tripsacum dactyloides and fertility as measured by percent seed set. Thus, fertility may be reliably used as a defining phenotype for apomixis when scoring the progeny from diploid (2n = 2x = 36) × tetraploid (2n = 4x = 72) crosses in Tripsacum. By exploiting the relationship between apomixis and fertility, as defined by seed set, analyses were performed on a set of related second-generation triploid populations segregating for apomixis. These populations were derived from sexual (diploid) × apomictic (tetraploid) crosses. Six out of 25 genome-dispersed restriction fragment length polymorphism (RFLP) markers co-segregate with fertility. Five of these markers were previously reported and include: php20855, tda48, tda53, umc62, and umc83, and are linked to Tripsacum genetic linkage groups F, I, H, L, and A, respectively. Significantly, we report here the syntenic relationships of the maize chromosome intervals to Tripsacum that segregate for numerous meiosis-specific and fertility-associated genes. Utilizing RFLP locus comparative mapping based on conservation of chromosome (genic) regions between related species, it may be concluded that the genes controlling fertility have been preserved in both Tripsacum and maize. A sixth marker, umc166, has also been shown to co-segregate with fertility and is conserved in both grass species. Specifically, umc166 is linked to Tripsacum linkage group D and, by syntenic comparison, to the short arm of maize chromosome 5. Encoded within this marked interval is the gene Ameiotic1 (Am1) whose function is required for the initiation of meiosis in both micro- and megaspore mother cells and whose absence of expression in the female is, in all likelihood, a prerequisite for the expression of apomixis.Key words: Tripsacum, apomixis, diplospory, comparative mapping, Zea.

Comparative mapping of the wheat Vrn-AI region with the rice Hd-6 region

Genome ◽  
1999 ◽  
Vol 42 (2) ◽  
pp. 204-209 ◽  
Author(s):  
K Kato ◽  
H Miura ◽  
S Sawada
Keyword(s):  
Heading Date ◽  
Wheat Chromosome ◽  
Photoperiod Response ◽  
Cdna Clones ◽  
Vernalization Response ◽  
Response Gene ◽  
Rice Chromosomes ◽  
Chromosome 5A ◽  
Comparative Genetic Mapping ◽  
Rice Cdna

Although extensive synteny between hexaploid wheat and rice chromosomes has been demonstrated, synteny between the species breaks down in several regions of the wheat genome carrying agronomically important genes. A possible relationship between the wheat Vrn-A1, the vernalization response gene on chromosome 5A, and the rice Hd-6, a QTL controlling heading date by photoperiod response on chromosome 3, was investigated. Rice cDNA clones which had previously been mapped onto the Hd-6 region were screened for comparative genetic mapping of the Vrn-A1 region. Ten markers mapped to Hd-6 were assigned to wheat chromosome 5A by nullisomic-tetrasomic analysis. Of them, four cDNA markers, linked within 2.2 cM in the rice Hd-6 region, were mapped on the flanking region of the wheat Vrn-A1, with a complete correspondence of order, demonstrating a fine-scale genetic collinearity. These results gave evidence that the wheat Vrn-A1 region is in synteny with the rice Hd-6 region.Key words: wheat, rice, vernalization response gene, photoperiod response gene, synteny.

Alternative Splicing of Photoperiod Response Gene Ppd-B1 in Wheat

2009 ◽  
Vol 35 (10) ◽  
pp. 1764-1770 ◽  
Author(s):  
Zhi-Ai GUO ◽  
Guang-Yao ZHAO ◽  
Zheng-Long REN ◽  
Ji-Zeng JIA
Keyword(s):  
Alternative Splicing ◽  
Photoperiod Response ◽  
Response Gene

Mapping a gene conferring resistance to Pseudocercosporella herpotrichoides on chromosome 4V of Dasypyrum villosum in a wheat background

Genome ◽  
1998 ◽  
Vol 41 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Ahmet Yildirim ◽  
Stephen S Jones ◽  
Timothy D Murray
Keyword(s):  
Distal Part ◽  
Dominant Gene ◽  
Rflp Markers ◽  
Addition Line ◽  
Dasypyrum Villosum ◽  
Pseudocercosporella Herpotrichoides ◽  
Eyespot Resistance ◽  
Double Recombination ◽  
Simultaneous Selection ◽  
Selection For

The objectives of this study were to map and tag the previously undescribed eyespot resistance gene PchDv on chromosome 4V of Dasypyrum villosum in a wheat background. The 82 F2 plants used for mapping were produced from a cross between a susceptible\i wheat 'Yangmai-5' (4V(4D)) substitution line and a resistant wheat 'Chinese Spring' disomic addition line of chromosome 4V of D. villosum. Segregation for resistance and susceptibility among F2 plants was 3:1, indicating that resistance was controlled by a single dominant gene. PchDv mapped to the distal part of chromosome 4V and was bracketed by two RFLP markers, Xcdo949 and Xbcd588, in a 33-cM interval. This distance could not be reduced, owing to a lack of polymorphic loci in this region. Theoretically, double recombination in this region occurs in 3.3% of the individuals; therefore, 96.7% of the selected genotypes would have PchDv, with simultaneous selection for both flanking markers. Double recombination between the flanking markers was observed in 2 out of 82 (2.4%) F2 individuals.

Identification and mapping of a photoperiod response gene (QPpd.zafu-4A) on wild emmer wheat (Triticum turgidum L.) chromosome 4AL

Euphytica ◽  
2019 ◽  
Vol 215 (9) ◽  
Author(s):  
Jinsheng Yu ◽  
Yunzheng Miao ◽  
Siqing Yang ◽  
Zhaobin Shi ◽  
Nana Miao ◽  
...  
Keyword(s):  
Triticum Turgidum ◽  
Wild Emmer Wheat ◽  
Emmer Wheat ◽  
Wild Emmer ◽  
Photoperiod Response ◽  
Response Gene

scholarly journals The Relationship Between Endurance Of Periscapular Muscles, Anaerobic Performance And Agility In Professional Athletes

2017 ◽  
Vol 5 (2_suppl2) ◽  
pp. 2325967117S0008
Author(s):  
Ali Zorlular ◽  
Gamze Çobanoğlu ◽  
Sinem Suner Keklik ◽  
Çağatay Müslim Gökdoğan ◽  
Esedullah Akaras ◽  
...  
Keyword(s):  
Distal Part ◽  
Vertical Jump ◽  
High Energy ◽  
Professional Athletes ◽  
Muscle Endurance ◽  
Anaerobic Performance ◽  
Professional Basketball ◽  
Jump Test ◽  
The Relationship ◽  
Positive Significant Correlation

Objective: The purpose of this study was to identify relationships between endurance of periscapular muscle, anaerobic performance and agility in professional athletes. Methods: 70 professional basketball, volleyball, and handball players (male: 25 female: 45 age 20.41±5.72, BMI: 21.70±2.51) were included to this study. Anaerobic performance was assessed with vertical jump test. Periscapular muscles endurance was evaluated using scapular muscle endurance test and agility was measured hexagonal obstacle test. Statistical analysis was performed using the statistical software SPSS 22. Results: Spearman correlation analysis results showed that there was positive significant correlation between anaerobic performance and endurance of periscapular muscles (p<0.05 r=0.341). A negative significant relationship was demonstrated between anaerobic performance and agility (p<0.05 r=-0.332), and between agility and endurance of periscapular muscles (p<0.05 r=-0.334). Discussion: The scapula acts as an axis, transmitting the power and high energy of the lower extremities and trunk to the upper extremities. The muscles surrounding the scapula provide proximal stability for the upper extremity and act as a fix while the distal part is moving. When weakness of scapular musculature has occurred, normal scapular positioning and mechanics may be altered. Therefore, scapular stabilization failure may lead to poor anaerobic performance. These results indicate that periscapular muscle endurance affects anaerobic and agility performance in sports.

New evidence for the synteny of rice chromosome 1 and barley chromosome 3H from rice expressed sequence tags

Genome ◽  
2001 ◽  
Vol 44 (3) ◽  
pp. 361-367 ◽  
Author(s):  
W Diederik Smilde ◽  
Jana Haluškova ◽  
Takuji Sasaki ◽  
Andreas Graner
Keyword(s):  
Expressed Sequence Tags ◽  
Comparative Mapping ◽  
Rice Chromosome ◽  
Single Copy ◽  
Chromosome 1 ◽  
Barley Chromosome ◽  
Barley Cultivars ◽  
Comparative Maps ◽  
Fitting In ◽  
Expressed Sequence

To provide improved access to the wealth of resources and genomic information that is presently being developed for rice a set of 88 rice expressed sequence tags (ESTs) previously mapped on rice chromosome 1 in the cross 'Nipponbare' × 'Kasalath' was used for comparative mapping in a cross of the barley cultivars 'Igri' and 'Franka'. As expected, most (89%) of the clones gave distinct banding patterns in barley of which about one-third was polymorphic between 'Igri' and 'Franka'. These polymorphisms were mapped, and most of these (56%) confirmed that rice chromosome 1 and barley chromosome 3H are syntenous. All single-copy markers identified conserved collinear positions, while markers with multiple copies did so in a few cases only. The markers that were not fitting in the collinear order were distributed randomly across the barley genome. The comparative maps of barley chromosome 3H and rice chromosome 1 comprise in total 26 common markers covering more than 95% of the genetic length of both chromosomes. A 30-fold reduction of recombination is seen around the barley centromere, and synteny may be interrupted in this region. However, the good overall synteny on a mesoscale (1–10 cM) justifies the use of rice as a platform for map-based cloning in barley.Key words: Oryza sativa, Hordeum vulgare, RFLP, synteny, comparative mapping.

Sign in / Sign up

Export Citation Format

Share Document