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English Abstract
Journal Article
Research Support, Non-U.S. Gov't
[Analysis of gene expression profiles during host-Magnaporthe grisea interactions in a pair of near isogenic lines of rice].
Yi Chuan Xue Bao = Acta Genetica Sinica 2002 October
A pair of near isogenic lines G205 and G71 were selected from recombinant inbred lines (RIL) of Zhong156 x Gumei2. On the resistance locus Pi-25(t), G205 had the resistant allele that was from Gumei 2 while G71 had the susceptible allele that was from Zhong156. For the genetic background, different alleles were detected on only 24 loci out of the 672 RFLP or SSLP loci surveyed. The expression profiles of G205 and G71 in response to Magnaporthe grisea were investigated using cDNA microarray containing 2200 Expression Sequence Tags (ESTs). The leaves were inoculated with the pathogen for 12 hours at 4-leaf stage and 998 genes were identified in total. Three genes were up-regulated significantly by the fungus in G205 only. The functions of two genes were known but that of the third gene were unknown. The two genes encoded casein kinase II alpha subunit and retrotransponson TOS17 insertion element respectively. Other thirty-five genes had similar expression patterns between NILs. Among them, 17 genes were up-regulated while 18 genes were down-regulated by the inoculation. The functions of 33 out of the 35 genes were known. BLAST analysis showed that all thirty-five. BLAST analysis showed that all thirty-five genes with known functions were relative to defense reactions, signal transduction, stress response, photosynthesis and sugar metabolism. Northern blot confirmed that four of five differentially displayed genes randomly selected had the same expression patterns as those detected in cDNA microarray. Two of them were up-regulated genes encoding casein kinase II alpha subunit and glycine-rich protein (Grp), and the other two down-regulated genes encoding nitrilase-associated protein and 18S small subnit ribosomal RNA gene respectively. Northern blot also revealed that the expression of Grp was consistently up-regulated from 0 to 36 h after the inoculation of the fungus. These results showed that cDNA microarray was a useful tool to study the molecular mechanisms of disease resistance in plants.
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