Meta-analysis of QTLs Involved in Pre-harvest Sprouting Tolerance and Dormancy in Bread Wheat  

Sandhya Tyagi , Pushpendra Kumar Gupta
Molecular Biology Laboratory, Department of Genetics and Plant Breeding, Ch. Charan Singh University, Meerut 250 004, India
Author    Correspondence author
Triticeae Genomics and Genetics, 2012, Vol. 3, No. 2   doi: 10.5376/tgg.2012.03.0002
Received: 05 Apr., 2012    Accepted: 12 Apr., 2012    Published: 05 May, 2012
© 2012 BioPublisher Publishing Platform
This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article:

Tyagi and Gupta, 2012, Meta-analysis of QTLs Involved in Pre-harvest Sprouting Tolerance and Dormancy in Bread Wheat, Triticeae Genomics and Genetics, Vol.3, No.2 9-24 (doi: 10.5376/tgg.2012.03.0002)

Abstract

In common wheat, meta-analysis of quantitative trait loci (QTL) associated with pre-harvest sprouting tolerance (PHST) and dormancy was carried out using results of 15 studies involving 15 different mapping populations. The study was restricted to only four chromosomes including three chromosomes of homoeologous group 3 (3A, 3B and 3D) and the chromosome 4A, since QTLs for PHST and dormancy on these four chromosomes were reported in several earlier studies, thus making these chromosomes suitable for meta-QTL analysis. The software BioMercator 2.1 was used to build a consensus map, and QTLs were projected on to this map for conducting meta-analysis. Using 36 of the 50 original QTLs, 8 meta-QTLs (MQTLs) were identified: 7 MQTLs were located on chromosomes of homoeologous group 3 including 3A (2 MQTL), 3B (3 MQTL) and 3D (2 MQTL), 1 MQTL was located on chromosome 4A. Confidence intervals (C.I.) for each of these 8 MQTLs were particularly narrow. The mapping information for 50 QTLs was also used for “overview” analysis to visualize important genomic regions carrying the MQTLs for PHST and dormancy. Co-localizations between candidate genes for dormancy/PHST (taVP1 and TaGA20-ox1) and MQTL positions appeared globally significant, although these candidate genes deserve further investigation. Markers associated with 8 MQTLs identified during the present study should prove helpful for introgression of tolerance against pre-harvest sprouting (PHS) into high yielding wheat varieties through marker-assisted selection (MAS).

Keywords
Meta-Analysis; Meta-QTL (MQTL); Pre-harvest sprouting tolerance (PHST); Dormancy; Wheat

Pre-harvest sprouting (PHS) in common wheat (Triticum astivum) is characterized by germination of grains in physiologically mature spikes, if subjected to prolonged wet weather conditions before harvest (Sharma et al., 1994; Groos et al., 2002; Kulwal et al., 2011). It is widely known that PHS leads to yield losses and downgrading of grain and seed quality, thus limiting their end use. It is also known that PHS is a complex trait that is affected by several genetic and environmental cues. In many breeding programs, introgression of grain dormancy is the primary target to improve pre-harvest sprouting tolerance (PHST), since seed dormancy is one of the important traits,

Triticeae Genomics and Genetics
• Volume 3
View Options
. PDF(1280KB)
. FPDF
. HTML
. Online fPDF
Associated material
. Readers' comments
Other articles by authors
pornliz suckporn sex videos bbw mom xxx big fucking arabin porn videos teen gril sex video riding hard cock woman hard vagina . Sandhya Tyagi
. Pushpendra Kumar Gupta
Related articles
. Meta-Analysis
. Meta-QTL (MQTL)
. Pre-harvest sprouting tolerance (PHST)
. Dormancy
. Wheat
Tools
. Email to a friend
. Post a comment