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Keeping the shoot above water – underwater stem elongation in watercress (Nasturtium officinale)

ABSTRACT: Keeping the shoot above water – underwater stem elongation in watercress (Nasturtium officinale)

PROVIDER: PRJNA574165 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10181065_1.fastq.gz	Fastqsanger.gz
	SRR10181065_2.fastq.gz	Fastqsanger.gz
	SRR10181066_1.fastq.gz	Fastqsanger.gz
	SRR10181066_2.fastq.gz	Fastqsanger.gz
	SRR10181067_1.fastq.gz	Fastqsanger.gz

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Keeping the shoot above water – underwater stem elongation in watercress (Nasturtium officinale)

Project description:Flooding stress is a major environmental threat for many terrestrial plants. The detrimental effects of flooding stress, however, vary between different plant species. Whereas many crops are rather sensitive to flooding, some wild species from flood-prone areas are well adapted to excess water conditions. Morphological adaptations like adventitious roots and aerenchyma formation, or the ability to elongate rapidly the above-ground organs, allow these plants to thrive in water. The focus of this research is Nasturtium officinale, also known as watercress, which is an auto-tetraploid, dicotyledonous and stem-growing Brassicaceae species. Its natural habitat is near rivers and streams, but absent from stagnant water. Submergence induces underwater elongation of stems and growth suppression of petioles in Nasturtium officinale. By using the RNA sequencing technique, we aimed to uncover the underlying mechanisms for these contrasting responses. Combining submergence experiments with hormone manipulations revealed that ABA degradation is required for stem elongation.

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Project description:In this study, we have performed Illumina based RNA sequencing to characterize the transcriptome and expression profiles of genes expressed in 3 tissues of L. officinale. RNA sequencing and de novo transcriptome assembly of L. officinale resulted in a total of 77,047 unigenes with N50 value as 1524 bps. KEGG pathway and GO enrichment analysis using highly expressed unigenes across three tissues showed active secondary metabolic processes specifically enriched to the root of L. officinale. Expression of identified candidate unigenes for specialized metabolites biosynthesis were consistent with previous reports on accumulation of metabolites across different tissues of L. officinale.

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Comparative transcriptomic analysis reveal the regulation mechanism underlying MeJA-induced accumulation of alkaloids in Dendrobium officinale

Project description:Dendrobium officinale is a traditional medicinal herb with a mount of bioactive components. Alkaloid is one of the major active ingredients of Dendrobium plants, and its immune regulatory effects have been well-studied. A total of 4857 DEGs, including 2943 up- and 1932 down-regulated genes, were identified between the control and MeJA-treated groups. Several shikimate and methylerythritol 4-phosphate pathway genes and a number of MeJA-induced P450 family genes, aminotransferase genes and methyltransferase genes were identified, providing several important candidates to further elucidate the alkaloid biosynthetic pathway of D. officinale. Furthermore, a large number of MeJA-induced transcript factor encoding genes were identified, suggesting a complex genetic network affecting the alkaloid metabolism in D. officinale.

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