RFLP mapping of five major genes and eight quantitative trait loci controlling flowering time in a winter × spring barley (Hordeum vulgare L.) cross

Genome ◽  
1995 ◽  
Vol 38 (3) ◽  
pp. 575-585 ◽  
Author(s):  
D. A. Laurie ◽  
N. Pratchett ◽  
J. W. Snape ◽  
J. H. Bezant
Keyword(s):  
Quantitative Trait Loci ◽  
Hordeum Vulgare ◽  
Flowering Time ◽  
Quantitative Trait ◽  
Field Experiments ◽  
Chromosome 2 ◽  
Vernalization Response ◽  
Major Genes ◽  
Trait Loci ◽  
Glasshouse Experiment

A genetic map of 92 RFLP loci and two storage protein loci was made using 94 doubled-haploid lines from a cross between the winter barley variety Igri and the spring variety Triumph. The markers were combined with data from two field experiments (one spring sown and one autumn (fall) sown) and a glasshouse experiment to locate a total of 13 genes (five major genes and eight quantitative trait loci (QTL)) controlling flowering time. Two photoperiod response genes were found; Ppd-H1 on chromosome 2(2H)S regulated flowering time under long days, while Ppd-H2 on chromosome 5(1H)L was detected only under short days. In the field experiments Ppd-H1 strongly affected flowering time from spring and autumn sowings, while Ppd-H2 was detected only in the autumn sowing. The glasshouse experiment also located two vernalization response genes, probably Sh and Sh2, on chromosomes 4(4H)L and 7(5H)L, respectively. The vernalization response genes had little effect on flowering time in the field. Variation in flowering time was also affected by nine additional genes, whose effects were not specifically dependent on photoperiod or vernalization. One was the denso dwarfing gene on chromosome 3(3H)L. The remaining eight were QTLs of smaller effect. One was located on chromosome 2(2H), one on 3(3H), one on 4(4H), one on 7(5H), two on 6(6H), and two on 1(7H). Model fitting showed that the 13 putative genes, and their interactions, could account for all the observed genetical variation from both spring and autumn sowings, giving a complete model for the control of flowering time in this cross.Key words: barley, Hordeum vulgare, flowering time, photoperiod, vernalization, mapping.

Quantitative trait loci for heading date and straw characters in barley

Genome ◽  
1995 ◽  
Vol 38 (6) ◽  
pp. 1098-1104 ◽  
Author(s):  
B. Kjær ◽  
J. Jensen ◽  
H. Giese
Keyword(s):  
Quantitative Trait Loci ◽  
Hordeum Vulgare ◽  
Doubled Haploid ◽  
Quantitative Trait ◽  
Rapd Markers ◽  
Spring Barley ◽  
Heading Date ◽  
Chromosome 6 ◽  
Chromosome 2 ◽  
Trait Loci

Quantitative trait loci (QTLs) for heading date and straw characters were examined in 79 chromosome-doubled haploid lines derived from the F1 generation of a cross between a six-rowed winter barley and a two-rowed spring barley. A genetic map covering 1100 cM containing 85 markers, including isozyme, morphological, RFLP, and RAPD markers, was constructed. All traits examined had two QTLs with large effects on chromosome 2. In addition, a QTL for length of the top internode was found on chromosome 6. The QTL in the chromosome segment around locus v (two row/six row) on chromosome 2 may be caused by pleiotropic effects of this locus. The same QTLs for heading date and straw length were found in both 1989 and 1991. The results indicate that two QTLs on chromosome 2 affect a group of correlated traits.Key words: Hordeum vulgare, earliness, RFLP, two rowed, six rowed, linkage map.

Molecular mapping of major genes and quantitative trait loci determining flowering time in response to photoperiod in barley

2002 ◽  
Vol 121 (2) ◽  
pp. 129-132 ◽  
Author(s):  
A. BORNER ◽  
G. H. BUCK-SORLIN ◽  
P. M. HAYES ◽  
S. MALYSHEV ◽  
V. KORZUN
Keyword(s):  
Quantitative Trait Loci ◽  
Flowering Time ◽  
Quantitative Trait ◽  
Molecular Mapping ◽  
Major Genes ◽  
Trait Loci

Genetic mapping in Lilium: mapping of major genes and quantitative trait loci for several ornamental traits and disease resistances

2010 ◽  
Vol 130 (3) ◽  
pp. 372-382 ◽  
Author(s):  
Arwa Shahin ◽  
Paul Arens ◽  
Adriaan W. Van Heusden ◽  
Gerard Van Der Linden ◽  
Martijn Van Kaauwen ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Genetic Mapping ◽  
Quantitative Trait ◽  
Major Genes ◽  
Trait Loci ◽  
Disease Resistances ◽  
Ornamental Traits

The effects of three muscling Quantitative Trait Loci on growth patterns of crossbred lambs

2009 ◽  
Vol 2009 ◽  
pp. 40-40
Author(s):  
N R Lambe ◽  
J M Macfarlane ◽  
A Masri ◽  
O Matika ◽  
W Haresign ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Growth Rates ◽  
Quantitative Trait ◽  
Growth Patterns ◽  
Chromosome 2 ◽  
Chromosome 18 ◽  
Fast Growing ◽  
Trait Loci

Texel Muscling QTL (TM-QTL) and LoinMaxTM (LM-QTL) are located on chromosome 18 in Texel and Poll Dorset sheep, respectively, and have been shown to positively affect muscling of the loin in crossbred lambs carrying one copy of the QTL (Macfarlane et al., 2008, Masri et al., 2009). MyoMaxTM (MM-QTL), found on chromosome 2 of Texel sheep, increases muscling and decreases fatness in lambs of different genetic backgrounds (Campbell and McLaren, 2007). No differences in live weights, carcass weights or growth rates have been associated with these QTL to date. However, there is further need to investigate the effects of the three QTL on growth patterns in commercial crossbred populations, where fast-growing slaughter lambs of good carcass weights and quality are a prerequisite.

scholarly journals Identification of Quantitative Trait Loci Relating to Flowering Time, Flag Leaf and Awn Characteristics in a Novel Triticum dicoccum Mapping Population

Plants ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 829
Author(s):  
Tally I.C. Wright ◽  
Angela C. Burnett ◽  
Howard Griffiths ◽  
Maxime Kadner ◽  
James S. Powell ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Quantitative Trait Loci ◽  
Flowering Time ◽  
Quantitative Trait ◽  
Marker Assisted Selection ◽  
Mapping Population ◽  
Flag Leaf ◽  
Snp Array ◽  
Leaf Length ◽  
Trait Loci

Tetraploid landraces of wheat harbour genetic diversity that could be introgressed into modern bread wheat with the aid of marker-assisted selection to address the genetic diversity bottleneck in the breeding genepool. A novel bi-parental Triticum turgidum ssp. dicoccum Schrank mapping population was created from a cross between two landrace accessions differing for multiple physiological traits. The population was phenotyped for traits hypothesised to be proxies for characteristics associated with improved photosynthesis or drought tolerance, including flowering time, awn length, flag leaf length and width, and stomatal and trichome density. The mapping individuals and parents were genotyped with the 35K Wheat Breeders’ single nucleotide polymorphism (SNP) array. A genetic linkage map was constructed from 104 F4 individuals, consisting of 2066 SNPs with a total length of 3295 cM and an average spacing of 1.6 cM. Using the population, 10 quantitative trait loci (QTLs) for five traits were identified in two years of trials. Three consistent QTLs were identified over both trials for awn length, flowering time and flag leaf width, on chromosomes 4A, 7B and 5B, respectively. The awn length and flowering time QTLs correspond with the major loci Hd and Vrn-B3, respectively. The identified marker-trait associations could be developed for marker-assisted selection, to aid the introgression of diversity from a tetraploid source into modern wheat for potential physiological trait improvement.

scholarly journals Genetic architecture of quantitative trait loci associated with morphological and agronomic trait differences in a wild by cultivated barley cross

Genome ◽  
2007 ◽  
Vol 50 (8) ◽  
pp. 714-723 ◽  
Author(s):  
L. Gyenis ◽  
S.J. Yun ◽  
K.P. Smith ◽  
B.J. Steffenson ◽  
E. Bossolini ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Hordeum Vulgare ◽  
Phenotypic Variation ◽  
Quantitative Trait ◽  
Genetic Architecture ◽  
Flag Leaf ◽  
Barley Cultivars ◽  
Trait Loci ◽  
Glume Length ◽  
Cultivated Barley

Hordeum vulgare subsp. spontaneum is the progenitor of cultivated barley (Hordeum vulgare L.). Domestication combined with plant breeding has led to the morphological and agronomic characteristics of modern barley cultivars. The objective of this study was to map the genetic factors that morphologically and agronomically differentiate wild barley from modern barley cultivars. To address this objective, we identified quantitative trait loci (QTLs) associated with plant height, flag leaf width, spike length, spike width, glume length in relation to seed length, awn length, fragility of ear rachis, endosperm width and groove depth, heading date, flag leaf length, number of tillers per plant, and kernel color in a Harrington/OUH602 advanced backcross (BC2F8) population. This population was genotyped with 113 simple sequence repeat markers. Thirty QTLs were identified, of which 16 were newly identified in this study. One to 4 QTLs were identified for each of the traits except glume length, for which no QTL was detected. The portion of phenotypic variation accounted for by individual QTLs ranged from about 9% to 54%. For traits with more than one QTL, the phenotypic variation explained ranged from 25% to 71%. Taken together, our results reveal the genetic architecture of morphological and agronomic traits that differentiate wild from cultivated barley.

scholarly journals Quantitative trait loci for yield and grain plumpness relative to maturity in three populations of barley (Hordeum vulgare L.) grown in a low rain-fall environment

PLoS ONE ◽  
2017 ◽  
Vol 12 (5) ◽  
pp. e0178111 ◽  
Author(s):  
Bulti Tesso Obsa ◽  
Jason Eglinton ◽  
Stewart Coventry ◽  
Timothy March ◽  
Maxime Guillaume ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Hordeum Vulgare ◽  
Quantitative Trait ◽  
Hordeum Vulgare L ◽  
Trait Loci ◽  
Rain Fall
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