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Expression data from RECA1-overexpressing plants

ABSTRACT: Arabidopsis nuclear RecA homologue RA51D were reported to be involved in plant defense responses. Plant organelles such as mitochondria and chloroplast also have their own RecA homologues. We focused on chloroplast RecA homologue RECA1 because it has been well known that the precursors of phytohormones and secondary metabolites related to plant defense responses are synthesized in chloroplast and recent studies have identified several chloroplastic proteins invoved with plant defense responses. We used microarrays to investigate the global gene expression changes by RECA1 and identified the up-regualted genes involved with plant defense response. 2-week-old Col-0 and RECA1(at1g79050)-overexpressing plants without any treatments were used for RNA extraction and hybridization on Affymetrix microarrays. Col-0 plants were used as control and T3 RECA1-overexpressing transgenic plants were used in this study.

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Hyesung Jeon

PROVIDER: E-GEOD-55913 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Expression data from RECA1-overexpressing plants

Project description:Arabidopsis nuclear RecA homologue RA51D were reported to be involved in plant defense responses. Plant organelles such as mitochondria and chloroplast also have their own RecA homologues. We focused on chloroplast RecA homologue RECA1 because it has been well known that the precursors of phytohormones and secondary metabolites related to plant defense responses are synthesized in chloroplast and recent studies have identified several chloroplastic proteins invoved with plant defense responses. We used microarrays to investigate the global gene expression changes by RECA1.

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Long-term growth under elevated CO2 differentially suppresses biotic stress genes in non-acclimated versus cold-acclimated winter wheat

Project description:This study compared the photosynthetic performance and the global gene expression of the winter hardy wheat Triticum aestivum cv Norstar grown under non-acclimated (NA) or cold-acclimated (CA) condition at either ambient CO2 or elevated CO2 (EC). CA Norstar maintained comparable light saturated and CO2 saturated rates of photosynthesis but lower quantum requirements for photosystem II and non photochemical quenching relative to NA plants even at EC. Neither NA nor CA plants were sensitive to feedback inhibition of photosynthesis at EC. Global gene expression using microarray combined with bioinformatics analysis revealed that genes affected by EC were 3 times higher in NA (1022 genes) compared to CA (372 genes) Norstar. The most striking effect was the down-regulation of genes involved in the plant defense responses in NA Norstar. In contrast, cold acclimation reversed this down regulation due to the cold induction of genes involved in plant pathogenesis resistance, and cellular and chloroplast protection. These results suggest that EC have less impact on plant performance and productivity in cold adapted winter hardy plants in the northern climates compared to warmer environments. Selection for cereal cultivars with constitutively higher expression of biotic stress defense genes may be necessary under EC during the warm growth period and in warmer climates.

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