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Triticeae Genomics and Genetics 2011, Vol.2, No.1, 1
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6
http://tgg.sophiapublisher.com
1
A Letter Open Access
SSR Mapping Locus Conferring on the Triple-Spikelet Trait of the Tibetan
Triple-spikelet Wheat (
Triticum aestivum
L. concv.
tripletum
)
Jun Li
1
, Qin Wang
1
, Huiting Wei
2
, Xiaorong Hu
1
, Wuyun Yang
1
1. Crop Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu, 610066, P.R. China
2. Institute of Plant Protection, Sichuan Academy of Agricultural Sciences, Chengdu, 610066, P.R. China
Corresponding author email:
yangwuyun@yahoo.com.cn;
Authors
Triticeae Genomics and Genetics, 2011, Vol.2, No.1 doi: 10.5376/tgg.2011.02.0001
Received: 22 Oct., 2011
Accepted: 01 Nov., 2011
Published: 29 Jan., 2012
This article was first published in Molecular Plant Breeding in Chinese, and here was authorized to translate and publish the paper in English under the terms of 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:
Li et al., 2011, SSR Mapping Locus Conferring on the Triple-Spikelet Trait of the Tibetan Triple-spikelet Wheat (
Triticum aestivum
L. concv.
tripletum
),
Triticeae Genomics and Genetics, Vol.2, No.1 1-6 (doi: 10.5376/tgg.2011.02.0001)
Abstract
Tibetan triple-spikelet wheat is a unique common wheat landrace in Tibet region of China, which has special triple
spikelet trait with supernumerary spikelets and florets. Molecular mapping the control gene locus conferring on triple spikelet trait
and mining the closely linked markers would be facilitate high-yield wheat breeding by marker-assisted selection approach. In this
study, TTSW
-
5 derived lines from Tibetan triple spikelet wheat and two common-spikelet wheat, Jian 3 and Chuanmai 55, were used
to construct the F
2
populations for phenotypic analysis and SSR genotyping. Genetic analysis of phenotypic traits showed that triple
spikelet trait of Tibetan triple spikelet wheat is controlled by two independent recessive gene loci. One QTL linked to the triple
spikelet trait was detected on the chromosome 2A by using F
2
population from TTSW
-
5/Jian 3 combination and SSR markers, the
targeted locus was located within two SSR markers, Xgwm275 and Xgwm122, the genetic distance between two markers is 6.6 cM
with LOD value 6.19, which can be explained 33.1% phenotypic variation, The detected locus tentatively named as qTS2A
-
1. We
speculated that qTS2A
-
1 locus might be one of dominant loci for controlling the triple spikelet trait, Therefore, SSR markers,
Xgwm275 and Xgwm122, might be used as assisted selection markers for triple spikelet trait in high-yield breeding program.
Keywords
Tibetan triple-spikelet wheat (
Triticum aestivum
L. concv.
Tripletum
); Tibetan wheat landrace; Triple-spikelet trait; SSR
mapping; Wheat high-yield breeding
Background
Wheat is the largest cultivated and the most consumed
cereal crops in the world to feed more than 35% of the
global population as well as to provide the necessary
nutrients of human beings in 20% of energy and
protein (Sun et al., 2009; Yang et al., 2004). As the
development of the world’s economy and changes in
the structures of foods in developing countries, particular
in the rapid growth of the world's population, wheat is
considered to be the crop with the world's largest
growth in demand (Rajaram, 2002). It is estimated
that global demand for wheat in 2020 will reach 840
million tons to 1050 million tons, which means that
wheat production needs to increase by 2.0% annually
on the basis of the existing production of 560 million
tons (Gill et al., 2004; Sun et al., 2009). Clearly, a
substantial increase of wheat production would be the
major solution to solve this problem. Therefore, breaking
yield barriers and enhancing yields per unit would be
the great challenges for wheat breeders. However,
breeders applied a small number of well-known
backbones of parents in long-term of wheat breeding
and improvement, leading to narrow the genetic base
of cultivated wheat varieties narrow. There are serious
genetic erosion resulting in pandemics of pest and
disease as well as great loss of yield in wheat
production (Porceddu et al., 1988; Yang et al., 2004),
which seriously constrains the further improvements
in wheat breeding program. In wheat germplasm
resources, the multiple-spikelet wheat (the numbers of
spikelet is 30 or more) is specific germplasm with the
traits of multiple spikelet and grains having the
potential to increase wheat yield. Therefore, Utilization
of this specific resource, a kind of multi-spikelet
wheat, to change the panicle morphological characters
as well as to enhance the number of spikelet and