scholarly journals Mapping of Novel QTL Regulating Grain Shattering Using Doubled Haploid Population in Rice (Oryza sativaL.)

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Gyu-Ho Lee ◽  
In-Kyu Kang ◽  
Kyung-Min Kim
Keyword(s):  
Doubled Haploid ◽  
Chromosome 1 ◽  
Doubled Haploid Population ◽  
Chromosome 6 ◽  
Abscission Layer ◽  
Dh Population ◽  
Severe Reduction ◽  
Rice Chromosomes ◽  
Evolutionary Step ◽  
Haploid Population

The critical evolutionary step during domestication of major cereals was elimination of seed shattering because the easy-to-shatter trait in wild relatives results in a severe reduction in yield. In this study, we analyzed the QTLs associated with shattering employing a high-density genetic map in doubled haploid (DH) population of rice (Oryza sativaL.). A genetic linkage map was generated with 217 microsatellite markers spanning 2082.4 cM and covering 12 rice chromosomes with an average interval of 9.6 cM between markers based on 120 DHLs derived from a cross between Cheongcheong indica type cultivar and Nagdong japonica type cultivar. In the QTL analysis, five QTLs pertaining to the breaking tensile strength (BTS) were detected in 2013 and 2015. Two regions of the QTLs related to BTS on chromosome 1 and chromosome 6 were detected. Several important genes are distributed in 1 Mbp region of the QTL on chromosome 6 and they are related to the formation of abscission layer. We decide to name this QTLqSh6and the candidate genes in theqSh6region can be employed usefully in further research for cloning.

Mapping QTL for grain yield, yield components, and spike features in a doubled haploid population of bread wheat

Genome ◽  
2011 ◽  
Vol 54 (6) ◽  
pp. 517-527 ◽  
Author(s):  
Bahram Heidari ◽  
Badraldin Ebrahim Sayed-Tabatabaei ◽  
Ghodratollah Saeidi ◽  
Michael Kearsey ◽  
Kazuhiro Suenaga
Keyword(s):  
Grain Yield ◽  
Doubled Haploid ◽  
Yield Components ◽  
Triticum Aestivum L ◽  
Interval Mapping ◽  
Doubled Haploid Population ◽  
Dh Population ◽  
Spike Number ◽  
Haploid Population ◽  
Major Qtl

A doubled haploid (DH) population derived from a cross between the Japanese cultivar ‘Fukuho-kumogi’ and the Israeli wheat line ‘Oligoculm’ was used to map genome regions involved in the expression of grain yield, yield components, and spike features in wheat (Triticum aestivum L). A total of 371 markers (RAPD, SSR, RFLP, AFLP, and two morphological traits) were used to construct the linkage map that covered 4190 cM of wheat genome including 28 linkage groups. The results of composite interval mapping for all studied traits showed that some of the quantitative trait loci (QTL) were stable over experiments conducted in 2004 and 2005. The major QTL located in the Hair–Xpsp2999 interval on chromosome 1A controlled the expression of grains/spike (R2 = 12.9% in 2004 and 22.4% in 2005), grain weight/spike (R2 = 21.4% in 2004 and 15.8% in 2005), and spike number (R2 = 15.6% in 2004 and 5.4% in 2005). The QTL for grain yield located on chromosomes 6A, 6B, and 6D totally accounted for 27.2% and 31.7% of total variation in this trait in 2004 and 2005, respectively. Alleles inherited from ‘Oligoculm’ increased the length of spikes and had decreasing effects on spike number. According to the data obtained in 2005, locus Xgwm261 was associated with a highly significant spike length QTL (R2 = 42.33%) and also the major QTL for spikelet compactness (R2 = 26.1%).

Gametophytic selection in a winter × spring barley cross

Genome ◽  
1991 ◽  
Vol 34 (6) ◽  
pp. 918-922 ◽  
Author(s):  
C. C. Schön ◽  
P. M. Hayes ◽  
T. K. Blake ◽  
S. J. Knapp
Keyword(s):  
Segregation Distortion ◽  
Doubled Haploid ◽  
Doubled Haploids ◽  
Spring Barley ◽  
Population Based ◽  
Doubled Haploid Population ◽  
Dh Population ◽  
Gametophytic Selection ◽  
Segregation Ratios ◽  
Haploid Population

Segregation distortion and the consequences of gametophytic selection were assessed in a winter × spring barley cross by comparing segregation of enzyme, storage protein, DNA, and morphological markers in three populations derived from the same cross: a control F2 (F2C), a doubled-haploid (DH) population, and an F2 derived from F1 plants self-pollinated at 10 °C (F2T). Segregation distortion was present in the F2T and the doubled-haploid population. Based on a comparison of the F2C and the F2T, gametophytic selection as a consequence of self-pollination at 10 °C was operative on chromosome 7 in regions linked to Rrn2. Segregation distortion in favor of the winter parent was found in the doubled-haploid population. There were significant deviations from expected segregation ratios at two loci, but only at one of the loci was the gene number significantly different from the F2C. Despite segregation distortion, the doubled-haploid population should be suitable for linkage analyses, as estimates of recombination based on F2 and doubled-haploid data were in close agreement.Key words: Hordeum vulgare, segregation distortion, doubled haploids, gametophytic selection, cold tolerance.

Mapping QTL controlling agronomic traits in a doubled haploid population of winter oilseed rape (Brassica napus L.)

2018 ◽  
Vol 97 (5) ◽  
pp. 1389-1406 ◽  
Author(s):  
Farshad Fattahi ◽  
Barat Ali Fakheri ◽  
Mahmood Solouki ◽  
Christian Möllers ◽  
Abbas Rezaizad
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Doubled Haploid ◽  
Agronomic Traits ◽  
Doubled Haploid Population ◽  
Winter Oilseed Rape ◽  
Brassica Napus L ◽  
Mapping Qtl ◽  
Haploid Population

scholarly journals The interrelationships of agronomic characters in a doubled haploid population of wheat

2012 ◽  
Vol 41 (Special Issue) ◽  
pp. 233-237
Author(s):  
B. Heidari ◽  
G. Saeidi ◽  
B.E. Sayed Tabatabaei ◽  
K. Suenaga
Keyword(s):  
Doubled Haploid ◽  
Full Text ◽  
Doubled Haploid Population ◽  
Agronomic Characters ◽  
Haploid Population

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scholarly journals Quantifying rooting at depth in a wheat doubled haploid population with introgression from wild emmer

2017 ◽  
Vol 120 (3) ◽  
pp. 457-470 ◽  
Author(s):  
Christina K Clarke ◽  
Peter J Gregory ◽  
Martin Lukac ◽  
Amanda J Burridge ◽  
Alexandra M Allen ◽  
...  
Keyword(s):  
Doubled Haploid ◽  
Wild Emmer ◽  
Doubled Haploid Population ◽  
Haploid Population
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