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Ambrosia artemisiifolia

ABSTRACT: Ragweed, common allergen

PROVIDER: PRJNA70935 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	JAQQBG01.dat.gz	Other
	JAQQBG01.fasta.gz	Fasta.gz
	JAQQBG01.master.dat	Other
	JAQQBH01.dat.gz	Other

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De-novo genome sequencing of Ambrosia artemisiifolia

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Project description:Characterizing restriction enzyme-associated loci in historic ragweed (Ambrosia artemisiifolia) voucher specimens using custom-designed RNA probes

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Chloroplast genome sequencing of common ragweed (Ambrosia artemisiifolia L)

Project description:Illumina sequencing of the common ragweed chloroplast genome (Ambrosia artemisiifolia L.)

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New sesquiterpenoids from Ambrosia artemisiifolia L.

Project description:A new pseudoguaianolide 1 and two new guaiane-type sesquiterpene glucosides 2 and 3, were isolated from the aerial parts of Ambrosia artemisiifolia L together with two known sesquiterpene dilactones 4 and 5. The new compounds were determined on the basis of spectroscopic and chemical methods to be 3?-acetoxy-4?-hydroxy-1?,7?, 10?,11?H-pseudoguaia-12,8?-olide (1), 1?,7?,9?,10?,13?H-guaia-4(5)-en-12,6?-olide 9-O-?-d-glucoside (2) and 4?-hydroxy-1?,5?,7?,9?H-guaia-10(14),11(13)-dien-12-acid 9-O-?-d-glucoside (3). The isolated compounds were evaluated for cytotoxicity against human promyelocytic leukemia HL-60 cell lines in vitro, but were all inactive.

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Project description:Creation of a reference transcriptome for the invasive annual, Ambrosia artemisiifolia.

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Sesquiterpenoids from the Inflorescence of <i>Ambrosia artemisiifolia</i>.

Project description:The successful invasion of Ambrosia artemisiifolia is largely due to allelopathy. As an invasive alien plant, A. artemisiifolia has spread rapidly in Asia and Europe. Studies have shown that sesquiterpenoids play an important role in plant allelopathy. However, it is unclear whether the inflorescence of A. artemisiifolia also contains allelopathic components. In this paper, our phytochemical research focuses on the inflorescence of A. artemisiifolia. Twenty sesquiterpenoids, including four new ones (1-4) were isolated through successive chromatographic columns and identified by spectroscopic methods. At a concentration of 200 μg/mL, all the compounds tested were evaluated for their allelopathic activities on seedling growth of wheat. Our results indicate that nine compounds inhibited both the root and shoot growth of seedlings. Compounds 14, 15, 17, and 20 significantly inhibited root length, which was more than 50% shorter than the control. This study identified the chemical profile of the sesquiterpenoids occurring in the inflorescence of A. artemisiifolia. The bioactivity screening results provide further understanding of the chemical basis of allelopathy in A. artemisiifolia.

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Pleiotropy facilitates local adaptation to distant optima in common ragweed (Ambrosia artemisiifolia).

Project description:Pleiotropy, the control of multiple phenotypes by a single locus, is expected to slow the rate of adaptation by increasing the chance that beneficial alleles also have deleterious effects. However, a prediction arising from classical theory of quantitative trait evolution states that pleiotropic alleles may have a selective advantage when phenotypes are distant from their selective optima. We examine the role of pleiotropy in regulating adaptive differentiation among populations of common ragweed (Ambrosia artemisiifolia); a species that has recently expanded its North American range due to human-mediated habitat change. We employ a phenotype-free approach by using connectivity in gene networks as a proxy for pleiotropy. First, we identify loci bearing footprints of local adaptation, and then use genotype-expression mapping and co-expression networks to infer the connectivity of the genes. Our results indicate that the putatively adaptive loci are highly pleiotropic, as they are more likely than expected to affect the expression of other genes, and they reside in central positions within the gene networks. We propose that the conditionally advantageous alleles at these loci avoid the cost of pleiotropy by having large phenotypic effects that are beneficial when populations are far from their selective optima. We further use evolutionary simulations to show that these patterns are in agreement with a model where populations face novel selective pressures, as expected during a range expansion. Overall, our results suggest that highly connected genes may be targets of positive selection during environmental change, even though they likely experience strong purifying selection in stable selective environments.

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