Plum pox virus(PPV),a quarantined viral pathogen in North America,causes one of the most devastating viral diseases of stone fruit trees such as peach,nectarine,plum,cherry and *** over 60 years' efforts,there are...
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Plum pox virus(PPV),a quarantined viral pathogen in North America,causes one of the most devastating viral diseases of stone fruit trees such as peach,nectarine,plum,cherry and *** over 60 years' efforts,there are no natural resistance genes that can be introduced into commercial cultivars through conventional breeding *** the development of novel strategies to control the viral disease,a better understanding of molecular PPV-host interactions is *** we report to analyze gene expression in Nictotiana benthamiana in response to PPV infection using a transcript imaging approach named complementary DNA amplified fragment length polymorphism(cDNA-AFLP).Of the 2,969 fragments detected, 123 transcription-derived fragments(TDFs) were differentially up-regulated in response to PPV infection and 33 *** was further used to confirm the expression *** genes are potential host genes directly involved in viral genome splicing,replication,viral protein translation,processing and transportation,and eventually viron ***1 and PVIP2 genes play critical roles in regulating cell division and RNA plymerases(RNAPs)-mediated *** PPV infection,viral protein VPg and RNA polymerase NIb bind to plant RNAPⅢTFIIIB complex which is physically connected to actin and PVIP genes, therefore forming a novel complex transcribing viral RNA and stimulating plant RNAPⅢsimultaneously.
Two DH lines in Chinese cabbage(***) were used as parents to develop a double haploid (DH) population that segregated for seed coat color *** segregation data suggested that one Mendelian locus controled the seed coat...
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Two DH lines in Chinese cabbage(***) were used as parents to develop a double haploid (DH) population that segregated for seed coat color *** segregation data suggested that one Mendelian locus controled the seed coat color trait in this *** testing 1100 primer combinations,14 SRAP markers were found to be linked to the seed coat color *** sequences of two closely linked SRAP molecular markers matched with annotated genes in *** clones anchoring these two markers were selected to confirm the gene order and colinearity between *** and *** Arabidopsis genome sequence as a reference,chromosome walking to the yellow-seeded gene was *** and SCAR molecular markers were developed and,together with the original SRAP molecular markers,a fine genetic map was *** map was aligned with its corresponding Arabidopsis physical map,showing that the gene order in this syntenic region containing the seed coat color gene in *** is the same as that in Arabidopsis. The closest molecular marker,SNP24650,was 0.2 cM away from the seed coat color *** next step is to find the candidate gene and to confirm its function through complementary transformation.
By carefully separating the typeⅠand typeⅡresistances,possible effects of plant height on Fusarium head blight(FHB) were assessed using near-isogenic lines(NILs) for several different reduced height (Rht) genes in *...
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By carefully separating the typeⅠand typeⅡresistances,possible effects of plant height on Fusarium head blight(FHB) were assessed using near-isogenic lines(NILs) for several different reduced height (Rht) genes in *** isolines all gave better typeⅠresistance than their respective dwarf counterparts when assessed at their natural *** differences were largely disappeared when the dwarf isolines were physically elevated so that their spikes were positioned at the same height of their respective tall counterparts. The effects of plant height on typeⅡseverity was less *** those of NIL pairs which showed significant differences,it's the dwarf isolines which gave better *** the Rht genes involved in these NILs locate at different genomic regions,the different FHB severities between the dwarf and tall isolines are unlikely due to linkages between each of the different Rht loci with a beneficial or a deleterious gene affecting typeⅠor typeⅡ***,the different FHB severities must be due to direct or indirect effects of height difference per se and microclimate seems a significant contributing factor to the better typeⅠresistance of the tall *** caution should be exercised when attempting to exploit any of those 'FHB resistant loci' co-located with Rht genes.
SPO11 is a eukaryotic homologue of the archaeal DNA topoisomerase VIA subunit(topo-VIA), which belongs to a family of typeⅡ***Ⅱtopoisomerases can be divided into two subclasses: typeⅡA and typeⅡ*** topoisomeraseⅥ...
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SPO11 is a eukaryotic homologue of the archaeal DNA topoisomerase VIA subunit(topo-VIA), which belongs to a family of typeⅡ***Ⅱtopoisomerases can be divided into two subclasses: typeⅡA and typeⅡ*** topoisomeraseⅥis a typeⅡB topoisomerase that functions as a heterotetramer that consists of two molecules of topoisomeraseⅥA(Top6A) and two of topoisomeraseⅥB (Top6B).They act together to separate replicated *** Top6A subunit can bind to DNA nonspecifically and is thought to cleave DNA via a 5'-phosphotyrosyl ***,most eukaryotes, including yeasts,worms and vertebrates only have a single gene for SPO11/Top6A and have no homologs for *** these organisms,SPO11 mediates the formation of DNA DSBs that initiate meiotic recombination. The molecular mechanism of the initiation of meiotic recombination is likely to be conserved widely amongst eukaryotes,as mutations in SPO11 leads to the similar meiotic ***,the initiation of homologous recombination by the formation of DSBs during meiosis is not the only function of SPO11;homolog pairing and formation of the SC is also dependent on the presence of SPO11 in many organisms. However,this is not always the case;in some organisms,including Drosophila melanogaster and Caenorhabditis elegans,normal SCs are formed between homologs,although meiotic recombination is eliminated if SPO11 is absent.
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