Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcriptional Analysis of lsm1a lsm1b Arabidopsis mutant.

ABSTRACT: Characterization of the lsm1a lsm1b transcriptional profile. LSM1 protein is involved in RNA decay through decapping facilitation. The performed array help us to understand the transcription level alterations produced by the absence of LSM1. One-condition experiment, Col-0 vs. lsm1a lsm1b plants. Biological replicates: 3 control replicates.

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Carlos Perea-Resa

PROVIDER: E-GEOD-39630 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

LSM proteins provide accurate splicing and decay of selected transcripts to ensure normal Arabidopsis development.

Perea-Resa Carlos C Hernández-Verdeja Tamara T López-Cobollo Rosa R del Mar Castellano María M Salinas Julio J

The Plant cell 20121207 12

In yeast and animals, SM-like (LSM) proteins typically exist as heptameric complexes and are involved in different aspects of RNA metabolism. Eight LSM proteins, LSM1 to 8, are highly conserved and form two distinct heteroheptameric complexes, LSM1-7 and LSM2-8,that function in mRNA decay and splicing, respectively. A search of the Arabidopsis thaliana genome identifies 11 genes encoding proteins related to the eight conserved LSMs, the genes encoding the putative LSM1, LSM3, and LSM6 proteins b ...[more]

PMID: 23221597

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Project description:Plant 9-lipoxygenases (9-LOX) and α-dioxygenases (α-DOX) initiate the synthesis of oxylipins after bacterial infection. Here, the role of these enzymes in plant’s defense was investigated using individual Arabidopsis thaliana lox1 and dox1 mutants and a double lox1 dox1 mutant. Studies with Pseudomonas syringae pv tomato (Pst) revealed the enhanced susceptibility of lox1 to the virulent strain Pst DC3000 and the partial impairment of lox1 and dox1 mutants to activate systemic acquired resistance. Notably, both defects were enhanced in the lox1 dox1 plants as compared with individual mutants. We found that pre-treatment with 9-LOX- and -DOX-generated oxylipins protected plant tissues against bacterial infection. The strongest effect in this respect was exerted by 9-ketooctadecatrienoic acid (9-KOT), which is produced from linolenic acid by 9-LOX. Quantification of 9-KOT revealed its accumulation after bacterial infection. The levels were reduced in lox1 and lox1 dox1 plants but strongly increased in the dox1 mutant due to metabolic interaction of the two pathways. Transcriptional analyses indicated that 9-KOT pre-treatment modifies hormone homeostasis during bacterial infection. The nature of the changes detected suggested that 9-KOT interfers the hormonal changes caused by bacterial effectors. This notion was substantiated by the finding that 9-KOT failed to reduce the growth of PstDC3000hrpA, a mutant compromised in effector secretion, and of the avirulent strain Pst DC3000 avrRpm1. Further support to the action of the 9-LOX- and -DOX-oxylipin pathways as modulators of hormone homeostasis was the observation that lox1 dox1 seedlings are hypersensitive to the growth-inhibitory effect of ABA and showed enhanced activation of ABA-inducible marker genes. Two experiments, Col-0 treated with 9-KOT vs. Col-0 treated with water and Col-0 treated with 9-KOT vs. Col-0 treated with water after treatment with Pst DC3000. Biological replicates: 4 control replicates treated , 4 9-KOT treated replicates; 4 control treated and Pst DC3000 replicates and 4 9-KOT treated and Pst DC3000 replicates

Dataset Information

Transcriptional Analysis of lsm1a lsm1b Arabidopsis mutant.

Publications

LSM proteins provide accurate splicing and decay of selected transcripts to ensure normal Arabidopsis development.

Similar Datasets

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