再生稻褐飞虱为害损失测定和防治指标的研究

在福建,褐飞虱是再生稻的重要害虫,中进行了再生稻褐飞虱为害损失的测定,并对褐飞虱为害再生稻造成的产量损失结构进行了通径分析。根据虫量和产量损失的关系,结合现行稻谷价格,产量水平,防治费用等因素。确定允许为害损失率,同时建立了再生稻褐飞虱防治指标模型,按照防治指标模型,制定出不同产量水平的防治指标。     

Separation and preparation of N-glycans based on ammonia-catalyzed release method

Glycoconjugate Journal - The study of carbohydrates requires large amounts of glycans. N-Glycans can be synthesized but generating large quantities of N-glycans with diverse structures remains...     

Nonreductive chemical release of intact N-glycans for subsequent labeling and analysis by mass spectrometry

A novel strategy is proposed, using cost-saving chemical reactions to generate intact free reducing N-glycans and their fluorescent derivatives from glycoproteins for subsequent analysis. N-Glycans without core α-1,3-linked fucose are released in reducing form by selective hydrolysis of the N-type carbohydrate–peptide bond of glycoproteins under a set of optimized mild alkaline conditions and are comparable to those released by commonly used peptide-N-glycosidase (PNGase) F in terms of yield without any detectable side reaction (peeling or deacetylation). The obtained reducing glycans can be routinely derivatized with 2-aminobenzoic acid (2-AA), 1-phenyl-3-methyl-5-pyrazolone (PMP), and potentially some other fluorescent reagents for comprehensive analysis. Alternatively, the core α-1,3-fucosylated N-glycans are released in mild alkaline medium and derivatized with PMP in situ, and their yields are comparable to those obtained using commonly used PNGase A without conspicuous peeling reaction or any detectable deacetylation. Using this new technique, the N-glycans of a series of purified glycoproteins and complex biological samples were successfully released and analyzed by electrospray ionization mass spectrometry (ESI–MS) and tandem mass spectrometry (MS/MS), demonstrating its general applicability to glycomic studies.     

Diverse set of microRNAs are responsive to powdery mildew infection and heat stress in wheat (<Emphasis Type="Italic">Triticum aestivum</Emphasis> L.)

Background  

MicroRNAs (miRNAs) are a class of small non-coding regulatory RNAs that regulate gene expression by guiding target mRNA cleavage or translational inhibition. MiRNAs can have large-scale regulatory effects on development and stress response in plants.     

Genetic Polymorphisms of DNA Repair Gene: XRCC1 Pro206Pro and Gln632Gln in a Chinese Han Population

DNA repair genes are increasingly studied because of their critical role in maintaining genome integrity. The base excision repair (BER) pathway is a DNA repair pathway that operates on small lesions, such as oxidized or reduced bases, fragmented or nonbulky adducts, or those produced by methylating agents. The XRCC1 polymorphic system is the key gene of the BER pathway. In this study, polymorphisms of XRCC1 Pro206Pro on exon 7 and Gln632Gln on exon 17 were analyzed in a northeastern Chinese Han population. Genomic DNA extracted from 303 unrelated individuals and the PCR-RFLP technique were used to identify variants. The allele frequencies were 0.90 (A) and 0.10 (G) for XRCC1 Pro206Pro and 0.88 (G) and 0.12 (A) for XRCC1 Gln632Gln. The genotype frequencies were 0.797 (AA), 0.203 (AG), and 0 (GG) for XRCC1 Pro206Pro and 0.007 (AA), 0.222 (AG), and 0.771 (GG) for XRCC1 Gln632Gln. The expected heterozygosity and PIC were 18 and 16.38% for Pro206Pro and 21.12 and 18.89% for Gln632Gln. The two polymorphisms were in strong linkage disequilibrium (D' = 0.921, r (2) = 0.735). The results are compared with those of other reported populations. They showed marked ethnic group differences. This study provides the first analysis of the distribution of allele frequency for XRCC1 Pro206Pro and Gln632Gln in a Chinese population.     

Identification and characterization of wheat long non-protein coding RNAs responsive to powdery mildew infection and heat stress by using microarray analysis and SBS sequencing

Background  

Biotic and abiotic stresses, such as powdery mildew infection and high temperature, are important limiting factors for yield and grain quality in wheat production. Emerging evidences suggest that long non-protein coding RNAs (npcRNAs) are developmentally regulated and play roles in development and stress responses of plants. However, identification of long npcRNAs is limited to a few plant species, such as Arabidopsis, rice and maize, no systematic identification of long npcRNAs and their responses to abiotic and biotic stresses is reported in wheat.     

Isolation and expression analysis of genes encoding DNA methyltransferase in wheat (Triticum aestivum L.)

DNA methylation of cytosine residues, catalyzed by DNA methyltransferases, is suggested to play important roles in regulating gene expression and plant development. In this study, we isolated four wheat cDNA fragments and one cDNA with open reading frame encoding putative DNA methyltransferase and designated TaMET1, TaMET2a, TaMET2b, TaCMT, TaMET3, respectively. BLASTX searches and phylogenetic analysis suggested that five cDNAs belonged to four classes (Dnmt1, Dnmt2, CMT and Dnmt3) of DNA methyltransferase genes. TaMET2a encoded a protein of 376 aa and contained eight of ten conserved motifs characteristic of DNA methyltransferase. Genomic sequence of TaMET2a was obtained and found to contain ten introns and eleven exons. The expression analysis of the five genes revealed that they were expressed in developing seed, during germination and various vegetative tissues, but in quite different abundance. It was interesting to note that TaMET1 and TaMET3 mRNAs were clearly detected in dry seeds. Moreover, the differential expression patterns of five genes were observed between wheat hybrid and its parents in leaf, stem and root of jointing stage, some were up-regulated while some others were down-regulated in the hybrid. We concluded that multiple wheat DNA methyltransferase genes were present and might play important roles in wheat growth and development.