Unknown,Transcriptomics,Genomics,Proteomics

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Comparative transcriptome analysis of wheat embryo and endosperm response to ABA and H2O2 stresses during seed germination

ABSTRACT: Wheat seed germination directly affects wheat yield and quality. The wheat grains mainly include embryo and endosperm, and both play important roles in seed germination, seedling survival and subsequent vegetative growth. ABA can positively regulate dormancy induction and then negatively regulates seed germination at low concentrations. H2O2 treatment with low concentration can promote seed germination of cereal plants. Although various transcriptomics and proteomics approaches have been used to investigate the seed germination mechanisms and response to various abiotic stresses in different plant species, an integrative transcriptome analysis of wheat embryo and endosperm response to ABA and H2O2 stresses has not reported so far. We used the elite Chinese bread wheat cultivar Zhenmai 9023 as material and performed the first comparative transcriptome microarray analysis between embryo and endosperm response to ABA and H2O2 treatments during seed germination using the GeneChip® Wheat Genome Array Wheat seed germination includes a great amount of regulated genes which belong to many functional groups. ABA/H2O2 can repress/promote seed germination through coordinated regulating related genes expression. Our results provide new insights into the transcriptional regulation mechanisms of embryo and endosperm response to ABA and H2O2 treatments during seed germination The six groups including embryo and endosperm response to pure water (CK), ABA and H2O2 were havested respectively, which were CK_embryo (CKem), CK_endosperm (CKe), ABA_embryo (ABAem), ABA_endosperm (ABAe), H2O2_embryo (H2O2em), H2O2_endosperm (H2O2e). Three independent experiments were performed for each group.

ORGANISM(S): Triticum aestivum

SUBMITTER: Yonglong Yu

PROVIDER: E-GEOD-64030 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Arabidopsis seed germination is coordinated with the strong induction of metabolic pathways required for the mobilisation and utilization of seed storage reserves. These are essential to support the seedling before the establishment of photoauxotrophic growth. The activity of genes encoding enzymes required for lipid mobilisation is regulated largely at the level of transcription, but our knowledge of how this regulation occurs is extremely limited. After germination the rate of lipid reserve mobilisation is determined by the carbohydrate status of the seedling and by the osmotic potential of the growth substrate. The plant response to both of these requires the action of the hormone abscisic acid (ABA). We have shown that this regulation is tissue specific (Penfield et al., 2004 Plant Cell 16, 2705-2718), and that although lipid breakdown in the embryo is inhibited by ABA, lipid breakdown in the endosperm tissues is not. Furthermore, in many species the action of the endosperm is central to the processes controlling seed germination, yet very little is known about gene expression in this tissue, or of the function of the endosperm in mature Arabidopsis seeds. Mature Arabidopsis seeds can be dissected into embryo and endosperm/seed coat fractions, with the latter fraction containing RNA only from the endosperm as the seed coat cells undergo programmed cell death during the latter stages of seed development. In this experiment we divide seeds into embryo and endosperm tissues and transcript profile both shortly after germination, or when germination and lipid reserve mobilisation are inhibited by ABA or by the gibberellin biosynthesis inhibitor paclobutrazol. In this way we can discover the endosperm transcriptome and uncover candidate regulators of lipid mobilisation by searching for genes showing differential expression between embryo and endosperm before and after ABA treatment. Experimenter name = Steven Penfield Experimenter phone = 01904 328759 Experimenter fax = 01904 328762 Experimenter department = Department of Biology Experimenter institute = Centre for Novel Agricultural Products Experimenter address = University of York Experimenter address = PO BOX 373 Experimenter address = York Experimenter zip/postal_code = YO10 5YW Experimenter country = UK Keywords: organism_part_comparison_design

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Comparative transcriptome analysis of wheat embryo and endosperm response to ABA and H2O2 stresses during seed germination

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