BackgroundStripe rust (Puccinia striiformis f. sp. tritici; Pst) and powdery mildew (Blumeria graminis f. sp. tritici; Bgt) are important diseases of wheat (Triticum aestivum) worldwide. Similar mechanisms and gene transcripts are assumed to be involved in the host defense response because both pathogens are biotrophic fungi. The main objective of our study was to identify co-regulated mRNAs that show a change in expression pattern after inoculation with Pst or Bgt, and to identify mRNAs specific to the fungal stress response.ResultsThe transcriptome of the hexaploid wheat line N9134 inoculated with the Chinese Pst race CYR 31 was compared with that of the same line inoculated with Bgt race E09 at 1, 2, and 3 days post-inoculation. Infection by Pst and Bgt affected transcription of 23.8% of all T. aestivum genes. Infection by Bgt triggered a more robust alteration in gene expression in N9134 compared with the response to Pst infection. An array of overlapping gene clusters with distinctive expression patterns provided insight into the regulatory differences in the responses to Bgt and Pst infection. The differentially expressed genes were grouped into seven enriched Kyoto Encyclopedia of Genes and Genomes pathways in Bgt-infected leaves and four pathways in Pst-infected leaves, while only two pathways overlapped. In the plant–pathogen interaction pathway, N9134 activated a higher number of genes and pathways in response to Bgt infection than in response to Pst invasion. Genomic analysis revealed that the wheat genome shared some microbial genetic fragments, which were specifically induced in response to Bgt and Pst infection.ConclusionsTaken together, our findings indicate that the responses of wheat N9134 to infection by Bgt and Pst shows differences in the pathways and genes activated. The mass sequence data for wheat–fungus interaction generated in this study provides a powerful platform for future functional and molecular research on wheat–fungus interactions.Electronic supplementary materialThe online version of this article (doi:10.1186/1471-2164-15-898) contains supplementary material, which is available to authorized users.
9.1. Minimize the Risks of Dutch Disease 43 9.2. Seek to Enhance Growth in the Short to Medium Term 44 9.3. Promote Good Governance and Reduce Corruption 44 9.4. Prepare an Exit Strategy 45 9.5. Regularly Reassess the Appropriate Policy Mix 45 Appendix 1. The Relationship between Aid Flows and Exchange Rates in Sub-Saharan Africa 46 Appendix 2. The Macroeconomics of Aid 49 References 59 Box
This Working Paper should not be reported as representing the views of the IMF. The views expressed in this Working Paper are those of the author(s) and do not necessarily represent those of the IMF or IMF policy. Working Papers describe research in progress by the author(s) and are published to elicit comments and to further debate. This paper evaluates the effects on the Bangladeshi economy of phasing out textile and clothing (T&C) quotas currently maintained by industrial countries. The planned abolition of the quotas under the Agreement on Textiles and Clothing in 2005 will alter the competitiveness of various exporting countries. Bangladesh relies heavily on textile and clothing exports and is potentially very vulnerable to this change in competitiveness. Based on assessments of quota restrictiveness and export similarity, and an analysis of its supply constraints, the paper concludes that Bangladesh could face significant pressure on its balance of payments, output, and employment when the quotas are eliminated.
With China's accession to the World Trade Organization in late 2001, many of its trading partners have become concerned that the resulting increased competition in the world's goods and capital markets will adversely affect their own growth prospects. This paper argues that China's closer integration into the world economy will impose adjustment costs on its trading partners in the short to medium term, but that the benefits it generates are likely to dominate in the long run.
Regional trade arrangements (RTAs) in Africa have been ineffective in promoting trade and foreign direct investment. Relatively high external trade barriers and low resource complementarity between member countries limit both intra-and extraregional trade. Small market size, poor transport facilities and high trading costs make it difficult for African countries to reap the potential benefits of RTAs. To increase regional trade and investment, African countries need to undertake more broad-based liberalization and streamline existing RTAs, supported by improvements in infrastructure and trade facilitation. Early action to strengthen the domestic revenue base would help address concerns over revenue losses from trade liberalization.
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