{"entity": "researcher", "timestamp": "2026-07-20T00:39:12.258Z", "family": "Wessels", "given": "Bernard A", "initials": "BA", "orcid": "0000-0003-0717-1630", "affiliations": ["Department of Plant Physiology, Ume\u00e5 University (Ume\u00e5 Plant Science Centre), 90187, Ume\u00e5, Sweden."], "links": {"self": {"href": "https://publications.scilifelab.se/researcher/6c8a7ef9a3e64345b2be703fb991cf41.json"}, "display": {"href": "https://publications.scilifelab.se/researcher/6c8a7ef9a3e64345b2be703fb991cf41"}}, "publications": [{"entity": "publication", "iuid": "6963712d5ff441bc82d154cba4a54fbb", "links": {"self": {"href": "https://publications.scilifelab.se/publication/6963712d5ff441bc82d154cba4a54fbb.json"}, "display": {"href": "https://publications.scilifelab.se/publication/6963712d5ff441bc82d154cba4a54fbb"}}, "title": "PopulusPtERF85 Balances Xylem Cell Expansion and Secondary Cell Wall Formation in Hybrid Aspen.", "authors": [{"family": "Seyfferth", "given": "Carolin", "initials": "C", "orcid": "0000-0002-8962-3778", "researcher": {"href": "https://publications.scilifelab.se/researcher/2237d285735b40eea838eedfe54a4454.json"}}, {"family": "Wessels", "given": "Bernard A", "initials": "BA", "orcid": "0000-0003-0717-1630", "researcher": {"href": "https://publications.scilifelab.se/researcher/6c8a7ef9a3e64345b2be703fb991cf41.json"}}, {"family": "Vahala", "given": "Jorma", "initials": "J"}, {"family": "Kangasj\u00e4rvi", "given": "Jaakko", "initials": "J"}, {"family": "Delhomme", "given": "Nicolas", "initials": "N", "orcid": "0000-0002-3053-0796", "researcher": {"href": "https://publications.scilifelab.se/researcher/107fbbd40f1444fb838ad4c0365738fa.json"}}, {"family": "Hvidsten", "given": "Torgeir R", "initials": "TR"}, {"family": "Tuominen", "given": "Hannele", "initials": "H"}, {"family": "Lundberg-Felten", "given": "Judith", "initials": "J"}], "type": "journal article", "published": "2021-08-03", "journal": {"title": "Cells", "issn": "2073-4409", "volume": "10", "issue": "8", "pages": "1971", "issn-l": "2073-4409"}, "abstract": "Secondary growth relies on precise and specialized transcriptional networks that determine cell division, differentiation, and maturation of xylem cells. We identified a novel role for the ethylene-induced Populus Ethylene Response Factor PtERF85 (Potri.015G023200) in balancing xylem cell expansion and secondary cell wall (SCW) formation in hybrid aspen (Populus tremula x tremuloides). Expression of PtERF85 is high in phloem and cambium cells and during the expansion of xylem cells, while it is low in maturing xylem tissue. Extending PtERF85 expression into SCW forming zones of woody tissues through ectopic expression reduced wood density and SCW thickness of xylem fibers but increased fiber diameter. Xylem transcriptomes from the transgenic trees revealed transcriptional induction of genes involved in cell expansion, translation, and growth. The expression of genes associated with plant vascular development and the biosynthesis of SCW chemical components such as xylan and lignin, was down-regulated in the transgenic trees. Our results suggest that PtERF85 activates genes related to xylem cell expansion, while preventing transcriptional activation of genes related to SCW formation. The importance of precise spatial expression of PtERF85 during wood development together with the observed phenotypes in response to ectopic PtERF85 expression suggests that PtERF85 contributes to the transition of fiber cells from elongation to secondary cell wall deposition.", "doi": "10.3390/cells10081971", "pmid": "34440740", "labels": {"National Genomics Infrastructure": "Service", "NGI Stockholm (Genomics Production)": "Service", "NGI Stockholm (Genomics Applications)": "Service", "Bioinformatics Support for Computational Resources": "Service"}, "xrefs": [{"db": "pii", "key": "cells10081971"}, {"db": "pmc", "key": "PMC8393460"}], "notes": [], "created": "2021-10-01T09:03:49.871Z", "modified": "2024-01-16T13:48:38.888Z"}, {"entity": "publication", "iuid": "c03e5bb7fa3a4716ba7efa89ba684c00", "links": {"self": {"href": "https://publications.scilifelab.se/publication/c03e5bb7fa3a4716ba7efa89ba684c00.json"}, "display": {"href": "https://publications.scilifelab.se/publication/c03e5bb7fa3a4716ba7efa89ba684c00"}}, "title": "Leaf metabolic signatures induced by real and simulated herbivory in black mustard (Brassica nigra).", "authors": [{"family": "Papazian", "given": "Stefano", "initials": "S", "orcid": "0000-0003-2538-8702", "researcher": {"href": "https://publications.scilifelab.se/researcher/5de990c59ec4460e92c414dbc0ed0b16.json"}}, {"family": "Girdwood", "given": "Tristan", "initials": "T"}, {"family": "Wessels", "given": "Bernard A", "initials": "BA", "orcid": "0000-0003-0717-1630", "researcher": {"href": "https://publications.scilifelab.se/researcher/6c8a7ef9a3e64345b2be703fb991cf41.json"}}, {"family": "Poelman", "given": "Erik H", "initials": "EH", "orcid": "0000-0003-3285-613X", "researcher": {"href": "https://publications.scilifelab.se/researcher/0bc115c757fb423aa0e0a0d5c720577e.json"}}, {"family": "Dicke", "given": "Marcel", "initials": "M", "orcid": "0000-0001-8565-8896", "researcher": {"href": "https://publications.scilifelab.se/researcher/824294e73c4d43948aa11139277ad550.json"}}, {"family": "Moritz", "given": "Thomas", "initials": "T", "orcid": "0000-0002-4258-3190", "researcher": {"href": "https://publications.scilifelab.se/researcher/95ad5b7fe48f42eda1328f54a385e097.json"}}, {"family": "Albrectsen", "given": "Benedicte R", "initials": "BR", "orcid": "0000-0002-9337-4540", "researcher": {"href": "https://publications.scilifelab.se/researcher/cf822eff202b4547849f8a8a9d4efc02.json"}}], "type": "journal article", "published": "2019-09-28", "journal": {"volume": "15", "issn": "1573-3890", "issue": "10", "pages": "130", "title": "Metabolomics", "issn-l": "1573-3882"}, "abstract": "The oxylipin methyl jasmonate (MeJA) is a plant hormone active in response signalling and defence against herbivores. Although MeJA is applied experimentally to mimic herbivory and induce plant defences, its downstream effects on the plant metabolome are largely uncharacterized, especially in the context of primary growth and tissue-specificity of the response.\n\nWe investigated the effects of MeJA-simulated and real caterpillar herbivory on the foliar metabolome of the wild plant Brassica nigra and monitored the herbivore-induced responses in relation to leaf ontogeny.\n\nAs single or multiple herbivory treatments, MeJA- and mock-sprayed plants were consecutively exposed to caterpillars or left untreated. Gas chromatography (GC) and liquid chromatography (LC) time-of-flight mass-spectrometry (TOF-MS) were combined to analyse foliar compounds, including central primary and specialized defensive plant metabolites.\n\nPlant responses were stronger in young leaves, which simultaneously induced higher chlorophyll levels. Both MeJA and caterpillar herbivory induced similar, but not identical, accumulation of tricarboxylic acids (TCAs), glucosinolates (GSLs) and phenylpropanoids (PPs), but only caterpillar feeding led to depletion of amino acids. MeJA followed by caterpillars caused higher induction of defence compounds, including a three-fold increase in the major defence compound allyl-GSL (sinigrin). When feeding on MeJA-treated plants, caterpillars gained less weight indicative of the reduced host-plant quality and enhanced resistance.\n\nThe metabolomics approach showed that plant responses induced by herbivory extend beyond the regulation of defence metabolism and are tightly modulated throughout leaf development. This leads to a new understanding of the plant metabolic potential that can be exploited for future plant protection strategies.", "doi": "10.1007/s11306-019-1592-4", "pmid": "31563978", "labels": {"Bioinformatics Support for Computational Resources": "Service", "Swedish Metabolomics Centre": "Service"}, "xrefs": [{"db": "pii", "key": "10.1007/s11306-019-1592-4"}, {"db": "pmc", "key": "PMC6765471"}], "notes": [], "created": "2020-01-07T15:47:26.746Z", "modified": "2025-10-17T13:03:17.353Z"}]}