[Cloning and phylogenetic analysis of low-molecular-weight glutenin subunit genes at Glu-B3 locus in common wheat relative species].
The common wheat relative species are important germplasm for wheat breeding. In the present study, novel allelic variants at Glu-B3 locus were cloned to provide gene resources for wheat quality improvement. Four Glu-B3-locus specific primer sets LB1F/LB1R, LB2F/LB2R, LB3F/LB3R, and LB4F/LB4R were employed to isolate novel allelic variants of GluB3-1, GluB3-2, GluB3-3, and GluB3-4 from seven common wheat relative species, i.e., T. durum, T. dicoccum, T. dicoccoides, Aegilops longissima, Ae. searsii, Ae. Bicornis, and Ae. speltoides, and the software MEGA 4 was used to construct a phylogenetic tree. In total, 16 novel allelic variants of GluB3-1, GluB3-3, and GluB3-4 genes were isolated from the seven common wheat relative species, designated GluB3-16, GluB3-35, GluB3-36, GluB3-37, GluB3-46, GluB3-47, GluB3-48, GluB3-49, GluB3-410, GluB3-411, GluB3-412, GluB3-413, GluB3-414, GluB3-415, GluB3-416 and GluB3-417, respectively. In detail, GluB3-16 was cloned from T. dicoccoides with LB1F/LB1R, and the molecular weight of the de-duced amino acid was 39.2 kDa. GluB3-35, GluB3-36, and GluB3-37 were isolated from T. durum and T. dicoccum with the primer set LB3F/LB3R, and the molecular weights of their deduced peptides were 44.5 kDa (GluB3-36) and 44.6 kDa (GluB3-35 and GluB3-37). The molecular weight of deduced peptides of GluB3-4 ranged from 38.6 kDa (GluB3-414) to 42.5 kDa (GluB3-413). All the 16 new allelic variants showed a single open reading frame (ORF), and their deduced amino-acid sequences had a typical sequence structure of LMW-GS. The allelic variants at Glu-B3 locus identified in com-mon wheat relative species provide potential gene resources for wheat quality breeding and gene transformation. The results suggested that these Glu-B3 genes originated from different evolution processes.
Wang
Lin-Hai
LH
Institute of Crop Science, National Wheat Improvement Center/The National Key Facility for Crop Gene Resources and Genetic Improvement, Chinese Academy of Agricultural Sciences (CAAS), Beijing 100081, China. linhai7960@126.com
Zhou
Min
M
Li
Hui-Ling
HL
He
Zhong-Hu
ZH
Xia
Xian-Chun
XC
D000595:Amino Acid Sequence; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D056426:Genetic Loci; D005983:Glutens / Q000737:chemistry / Q000235:genetics*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D016366:Open Reading Frames; D010802:Phylogeny; D021122:Protein Subunits / Q000235:genetics; D014908:Triticum / Q000235:genetics*
D021122:Protein Subunits; D005983:Glutens; C037302:glutenin