Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Expression data from Arabidopsis suspension cells overexpressing LHW and T5L1-GFP

ABSTRACT: Plant vascular tissues are essential for the existence of land plants. Many studies have revealed the process underlying the development of vascular tissues. However, the initiation of vascular development is still a mystery. LONESOME HIGHWAY (LHW), which encodes a bHLH transcription factor, is expressed in the initial step of vascular development in roots. LHW and TMO5 LIKE1 (T5L1) interact each other and function as a heterodimer. Here, we identified specific genes downstream of LHW-T5L1 with transformed suspension culture cells in microarray experiments. To identify genes downstream of LHW-T5L1, we collected three samples at 0h and 12h with or without estrogen with triplicates.

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Kyoko Ohashi-Ito

PROVIDER: E-GEOD-57860 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:In fungi, sexual compatibility is controlled by mating type loci that prevent self-fertilization. In the plant pathogenic fungus Ustilago maydis, the b mating type locus encodes a pair of unrelated homeodomain proteins, termed bE and bW. After fusion of two compatible, haploid cells, the bE and bW proteins form a heterodimeric complex, but only if they are derived from different, compatible alleles. The active bE/bW complex is required and sufficient to initiate pathogenic development of U. maydis, which is prerequisite for sexual reproduction of the fungus. However, the role of the b heterodimer during later stages of pathogenic development was unclear. To analyze b function during in planta development, we generated a temperature-sensitive bE allele (bEts) encoding a protein with a single amino acid alteration at the border of the homeodomain. This mutation leads to a stop in pathogenic development at the restrictive temperature in planta, while bEts strains show normal development at permissive temperature. At restrictive temperature, hyphae develop enlarged, bulbous cells at their tips that contain multiple nuclei, indicating a severe defect in cell division. DNA array analysis of bEts mutant strains in planta revealed a b-dependent regulation of genes coding for secreted proteins that were shown to influence fungal virulence. Our data demonstrate that in U. maydis the b heterodimer is not only essential to establish the heterodikaryon after mating of two compatible sporidia and to initiate fungal pathogenicity, but also to sustain in planta proliferation and ensure sexual reproduction. Maize plants were infected with a mixture of either FB1 and FB2 (wild-type), or RAb1ts and RAb2ts (temperature-sensitive b heterodimer) and kept at 22Â°C (permissive conditions). Control samples of FB1/FB2 and RAb1ts and RAb2ts were taken 5 days post inoculation at 22 Â°C (1 replicate each), to see if strains expressing the bts heterodimer show wildtype-like biotrophic development. To measure the impact of the b heterodimer on pathogenic development, infected plants were shifted for 9 hours to resrictive conditions (31Â°C) 111 hours post infection. After the temperature shift FB1/FB2 (3 replicates) infections developed normal, whereas RAb1ts/RAb2ts (3 replicates) infections were not able to further proliferate in planta because of a none-functional b heterodimer.

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Expression data from Arabidopsis suspension cells overexpressing LHW and T5L1-GFP

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