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Articles by Youliang Zheng
Total Records ( 3 ) for Youliang Zheng
  Zehong Yan , Shoufen Dai , Dengcai Liu , Yuming Wei , Jirui Wang and Youliang Zheng
  A novel HMW-GS of Bx6** , with slightly slower migration rate than that of Bx7 presented in wheat cultivar Chinese Spring, was found in a Tibet bread wheat landrace using SDS-PAGE. The gene for this subunit was isolated and its sequence was obtained. This gene was very similar to Bx7 both in nucleotide and deduced amino acid sequence. At the nucleotide sequence level, Bx6** different from Bx7 by the deletion of an 18 bp fragment and three nucleotides replacement at position 455 A/G, 2046 G/A and 2208C/G, respectively. At the deduced amino acid sequence level, the only difference is that Bx6** shorter than Bx7 by the deletion of a hexaploid peptide unit (PGQGKQ). These results suggested that Bx6** was a derivation of Bx7 and was formed by replication slippage.
  Xing Chen , Wei Li , Yuming Wei , Guoyue Chen and Youliang Zheng
  The aim of this research was to isolate and characterize the α-gliadin genes from T. turgidum ssp. paleocolchium. Nine genes were isolated from T. turgidum ssp. paleocolchicum (2n = 4x = 28, AABB) using the designed primers PF1 and PF2. The deduced protein sequences of the nine genes share the same typical polypeptide structures with known α-gliadin sequences. Among the nine α-gliadin genes, only Gli1-7 and Gli 2-4 encoded putative mature proteins and the others were assumed to be pseudogenes due to their in-frame stop codon, which are attributed to the single base change C to T. Multi-alignment analysis indicated that the difference of the nine sequences mainly existed in the repetitive domain and the two polyglutamine regions. The repetitive domain could be considered as the array of 14 motifs based on the codon series CCA TT/AT CCA/G CAR, where CAR represents a 3-6 glutamine codon-rich region. Almost all codons in polyglutamine domains encode glutamine. However, 26 codons are not glutamine codons, which mainly resulted from single base changes. It is also found that the polyglutamine domain II is more variable than the polyglutamine domain I. Gli1-2 contained an extra cysteine, which was created by a serine-to-cysteine residue change at position 240, thus, it would have one free cysteine for intermolecular disulfide bond formation. Cluster analysis showed that sequences Gli1-10, Gli2-5 and Gli2-4 might be obtained from the genome A, whereas Gli2-2 and Gli1-9 from the genome B.
  Zhien Pu , Guoyue Chen , Jirui Wang , Yaxi Liu , Qiantao Jiang , Wei Li , Xiujing Lan , Shoufen Dai , Yuming Wei and Youliang Zheng
  In this study, the ARF genes were cloned, sequenced and located on the chromosomes. The gene expression of various stress conditions were analyzed through RT-PCR. Two important features of ARF in wheat were found: (1) High sequences homology among species in mammalian and plant and (2) Four exons and three introns were conserved in Poaceae. In this study the coding genes of ADP-ribosylation Factors (ARF) were characterized and they were located on chromosomes 3AL and 2DL in common wheat and its diploid progenitors. Forty-seven candidate SNPs in ARF were detected which were located in exons (17 SNPs) and introns (30 SNPs), respectively. As expected, most of the SNPs (66.34%) in ARF were transitions and the rest (33.66%) were transversions. The expression difference of ARF under various environmental stresses (low-temperature, Abscisic Acid (ABA), Polyethylene Glycol (PEG), NaCl, stripe rust), in two stages (seedling and maturity) and in different tissues (root, stem, flag leaf and immature embryo) of 15 days post-flowering were investigated. The results revealed that the expression levels of ARF were affected by environmental stresses. PEG stress induced the highest level of ARF expression, followed by the stripe rust and ABA stresses.
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