Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of soybean with respect to Pahakopsora pachyrhizii at V2 growth stage

ABSTRACT: A small number of genes (25) expressed differentially with respect to Phakopsora pachyrhizii at V2 growth stage.. We used Affymetrix soybean microarrays to detail the global gene expression underlying host reaction to Phakopsora pachyrhizii and identified differentially expressed genes during this process. Experiment Overall Design: Soybean cv. 5601T plants were grown in greenhouse in six 4-liter pots. Three weeks old plants at V2 growth stage in three out of six pots were inoculated with Phakopsora pachyrhizi and remaining three pots were used as control. Leaf samples from all pots were collected 72 hours after inoculation and RNA was extracted using Tri-Regent. Microarray analysis was performed using Affymetrix platform.

ORGANISM(S): Glycine max

SUBMITTER: Dilip Raj Panthee

PROVIDER: E-GEOD-7108 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Wheat leaf rust caused by the pathogenic fungus Puccinia triticina, is a serious threat to bread wheat and durum production in many areas of the world. This plant-pathogen interaction has been studied extensively at the molecular genetics level, however proteomics data are still relatively scarce. The present study investigated temporal changes in the abundance of the apoplastic fluid proteome of wheat leaves infected with either virulent or avirulent races of P. triticina, using a label-free LC-MS-based approach. In general, there was very little difference between inoculated and control apoplastic proteomes as a result of either race of pathogen, until haustoria had become well established in the incompatible interaction, although the resistant host responds to pathogen challenge sooner than the susceptible. In the earlier samplings (up to 72 h after inoculation), there were 46 host proteins with significantly changing abundance, however pathogen proteins were detected only rarely and not reproducibly. This is consistent with the hemi-biotrophic life-style of P. triticina; the pathogen infection is characterized by an early phase of a symbiosis-like relationship, followed by a later stage of pathogenesis, with tissue damage and parasitism. The majority of the host proteins with altered abundance up to 72 h post-inoculation were pathogen-response-related, including peroxidases, chitinases, β-1-3-endo-glucanases and PR-proteins. Five days after inoculation with the incompatible race it was possible to detect 150 PT proteins and 117 host proteins which had significantly increased in abundance as well as 33 host proteins which had significantly decreased in abundance and which represent potential targets of pathogen effectors. The pathogen-expressed proteins – seen most abundantly in the incompatible interaction – were mostly uncharacterized proteins, however many of their functions could be inferred through homology-matching with pBLAST. Pathogen proteins also included several candidate effector proteins, some novel and some which have been reported previously from the purified haustoria proteome.

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Transcription profiling of soybean with respect to Pahakopsora pachyrhizii at V2 growth stage

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