NDLI: The wheat (T. aestivum) sucrose synthase 2 gene (TaSus2) active in endosperm development is associated with yield traits

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The wheat (T. aestivum) sucrose synthase 2 gene (TaSus2) active in endosperm development is associated with yield traits

Content Provider	Springer Nature Link
Author	Jiang, Qiyan Hou, Jian Hao, Chenyang Wang, Lanfen Ge, Hongmei Dong, Yushen Zhang, Xueyong
Copyright Year	2010
Abstract	Sucrose synthase catalyzes the reaction sucrose + UDP → UDP-glucose + fructose, the first step in the conversion of sucrose to starch in endosperm. Previous studies identified two tissue-specific, yet functionally redundant, sucrose synthase (SUS) genes, Sus1 and Sus2. In the present study, the wheat Sus2 orthologous gene (TaSus2) series was isolated and mapped on chromosomes 2A, 2B, and 2D. Based on sequencing in 61 wheat accessions, three single-nucleotide polymorphisms (SNPs) were detected in TaSus2-2B. These formed two haplotypes (Hap-H and Hap-L), but no diversity was found in either TaSus2-2A or TaSus2-2D. Based on the sequences of the two haplotypes, we developed a co-dominant marker, TaSus2-2B tgw, which amplified 423 or 381-bp fragments in different wheat accessions. TaSus2-2B tgw was located between markers Xbarc102.2 and Xbarc91 on chromosome 2BS in a RIL population from Xiaoyan 54 × Jing 411. Association analysis suggested that the two haplotypes were significantly associated with 1,000 grain weight (TGW) in 89 modern wheat varieties in the Chinese mini-core collection. Mean TGW difference between the two haplotypes over three cropping seasons was 4.26 g (varying from 3.71 to 4.94 g). Comparative genomics analysis detected major kernel weight QTLs not only in the chromosome region containing TaSus2-2B tgw, but also in the collinear regions of TaSus2 on rice chromosome 7 and maize chromosome 9. The preferred Hap-H haplotype for high TGW underwent very strong positive selection in Chinese wheat breeding, but not in Europe. The geographic distribution of Hap-H was perhaps determined by both latitude and the intensity of selection in wheat breeding.
Starting Page	49
Ending Page	61
Page Count	13
File Format	PDF
ISSN	1438793X
Journal	Functional & Integrative Genomics
Volume Number	11
Issue Number	1
e-ISSN	14387948
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-09-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Triticum aestivum Sucrose synthase 2 Haplotype Thousand grain weight Biochemistry Bioinformatics Plant Genetics & Genomics Animal Genetics and Genomics Microbial Genetics and Genomics Cell Biology
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine

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