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Lepidium sativum

ABSTRACT: Lepidium sativum overview

PROVIDER: PRJNA276020 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR1801310_1.fastq.gz	Fastqsanger.gz
	SRR1801310_2.fastq.gz	Fastqsanger.gz
	SRR1801311_1.fastq.gz	Fastqsanger.gz
	SRR1801311_2.fastq.gz	Fastqsanger.gz

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Project description:This series analyses germinating Lepidium sativum seeds with both temporal and spatial detail. This is a cross species microarray normalisation on Arabidopsis thaliana chips. Performed as part of the vSEED project Lepidium seeds were dissected into four compartments at seven time points during seed germination. The compartments were the micropylar endosperm (CAP), the non-micropylar endosperm (NME), the radicle and lower hypocotyl (RAD) and the cotyledons (COT). At testa and endosperm rupture the seeds were split into pre- and post- ruptured populations. Dry seeds were also sampled: as a whole seed (DRY), the radicle and endosperm part (DRYRC) and the dry seed part containing the non-micropylar endosperm and part of the cotyledons (DRYNMC).

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Comparative genomic hybridization of DNA from Lepidium sativum and Arabidopsis thaliana

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The Phytotoxin Myrigalone A Triggers a Phased Detoxification Programme and Inhibits Lepidium sativum Seed Germination via Multiple Mechanisms Including Interference with Auxin Homeostasis

Project description:Molecular responses of plants to natural phytotoxins comprise more general and com-pound-specific mechanisms. How phytotoxic chalcones and other flavonoids inhibit seedling growth was widely studied, but how they interfere with seed germination is largely unknown. The dihydrochalcone and putative allelochemical myrigalone A (MyA) inhibits seed germination and seedling growth. Transcriptome (RNAseq) and hormone analyses of Lepidium sativum seed re-sponses to MyA were compared to other bioactive and inactive compounds. MyA treatment of imbibed seeds triggered the phased induction of a detoxification programme, altered gibberellin, cis-(+)-12-oxophytodienoic acid and jasmonate metabolism, and affected the expression of hor-mone transporter genes. The MyA-mediated inhibition involved interference with the antioxidant system, oxidative signalling, aquaporins and water uptake, but not uncoupling of oxidative phosphorylation or p-hydroxyphenylpyruvate dioxygenase expression/activity. MyA specifically affected the expression of auxin-related signalling genes, and various transporter genes, including for auxin transport (PIN7, ABCG37, ABCG4, WAT1). Responses to auxin-specific inhibitors further supported the conclusion that MyA interferes with auxin homeostasis during seed germination. Comparative analysis of MyA and other phytotoxins revealed differences in the specific regulatory mechanisms and auxin transporter genes targeted to interfere with auxin homestasis. We conclude that MyA exerts its phytotoxic activity by multiple auxin-dependent and independent molecular mechanisms.

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