Wildhagen, Henning

[["dc.bibliographiccitation.firstpage","129"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","New Phytologist"],["dc.bibliographiccitation.lastpage","141"],["dc.bibliographiccitation.volume","194"],["dc.contributor.author","Janz, Dennis"],["dc.contributor.author","Lautner, Silke"],["dc.contributor.author","Wildhagen, Henning"],["dc.contributor.author","Behnke, Katja"],["dc.contributor.author","Schnitzler, Jörg-Peter"],["dc.contributor.author","Rennenberg, Heinz"],["dc.contributor.author","Fromm, Jörg"],["dc.contributor.author","Polle, Andrea"],["dc.date.accessioned","2017-09-07T11:49:19Z"],["dc.date.available","2017-09-07T11:49:19Z"],["dc.date.issued","2012"],["dc.description.abstract","Summary - Salinity causes osmotic stress and limits biomass production of plants. The goal of this study was to investigate mechanisms underlying hydraulic adaptation to salinity. - Anatomical, ecophysiological and transcriptional responses to salinity were investigated in the xylem of a salt‐sensitive (Populus × canescens) and a salt‐tolerant species (Populus euphratica). - Moderate salt stress, which suppressed but did not abolish photosynthesis and radial growth in P. × canescens, resulted in hydraulic adaptation by increased vessel frequencies and decreased vessel lumina. Transcript abundances of a suite of genes (FLA, COB‐like, BAM, XET, etc.) previously shown to be activated during tension wood formation, were collectively suppressed in developing xylem, whereas those for stress and defense‐related genes increased. A subset of cell wall‐related genes was also suppressed in salt‐exposed P. euphratica, although this species largely excluded sodium and showed no anatomical alterations. Salt exposure influenced cell wall composition involving increases in the lignin : carbohydrate ratio in both species. - In conclusion, hydraulic stress adaptation involves cell wall modifications reciprocal to tension wood formation that result in the formation of a novel type of reaction wood in upright stems named ‘pressure wood’. Our data suggest that transcriptional co‐regulation of a core set of genes determines reaction wood composition."],["dc.identifier.doi","10.1111/j.1469-8137.2011.03975.x"],["dc.identifier.gro","3147274"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/7404"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4894"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0028-646X"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Salt stress induces the formation of a novel type of ‘pressure wood’ in two Populus species"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dc.type.version","submitted_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","304"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Environmental and Experimental Botany"],["dc.bibliographiccitation.lastpage","311"],["dc.bibliographiccitation.volume","72"],["dc.contributor.author","Luo, Zhi-Bin"],["dc.contributor.author","Li, Ke"],["dc.contributor.author","Gai, Ying"],["dc.contributor.author","Göbel, Cornelia"],["dc.contributor.author","Wildhagen, Henning"],["dc.contributor.author","Jiang, Xiangning"],["dc.contributor.author","Feußner, Ivo"],["dc.contributor.author","Rennenberg, Heinz"],["dc.contributor.author","Polle, Andrea"],["dc.date.accessioned","2017-09-07T11:49:32Z"],["dc.date.available","2017-09-07T11:49:32Z"],["dc.date.issued","2011"],["dc.description.abstract","Ectomycorrhizas (EMs) are mutualistic associations between soil fungi and plant roots. Although the physical interaction occurs only in roots, mycorrhizas may alter the physiology of the whole plant, resulting in changes in host responses to abiotic stress. To elucidate the influence of an ectomycorrhizal fungus on leaf physiology and performance under salt stress, we analysed the levels of nutrient elements, phytohormones, carbohydrates, amino compounds and fatty acids in leaves of Populus × canescens. The poplars were cultivated either in the presence or absence of Paxillus involutus and either with or without salt stress imposed by 150 mM NaCl. Leaves of ectomycorrhizal plants displayed higher quantum yield of photochemistry (ΦPSII), increased concentrations of phosphorus and potassium, decreased concentrations of galactose, increased concentrations of the stress metabolite γ-amino butyric acid and a lower unsaturated-to-saturated fatty acid ratios than those of non-ectomycorrhizal plants. Salt exposure of P. × canescens led to leaf chlorosis and shedding, decreases in ΦPSII, K+-to-Na+ ratio, 9Z-hexadecenoic acid, 9Z-octadecenoic acid and unsaturated-to-saturated fatty acid ratio, and increases in ABA, glucose, fructose and some amino compounds. Under salinity leaves of ectomycorrhizal plants showed an alleviation of leaf chlorosis, improved water status, higher ΦPSII and K+-to-Na+ ratio, less accumulation of major amino compounds and lower unsaturated-to-saturated fatty acid ratios than those of non-mycorrhizal plants. These results indicate that ectomycorrhizas attenuate salinity induced injury in leaves of P. × canescens, which may be ascribed to the improved nutrient status, osmo-regulation and changes in fatty acid composition in leaves of ectomycorrhizal plants."],["dc.identifier.doi","10.1016/j.envexpbot.2011.04.008"],["dc.identifier.gro","3147312"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4918"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0098-8472"],["dc.title","The ectomycorrhizal fungus (Paxillus involutus) modulates leaf physiology of poplar towards improved salt tolerance"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1515"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Plant Physiology"],["dc.bibliographiccitation.lastpage","1529"],["dc.bibliographiccitation.volume","160"],["dc.contributor.author","Larisch, Christina"],["dc.contributor.author","Dittrich, Marcus"],["dc.contributor.author","Wildhagen, Henning"],["dc.contributor.author","Lautner, Silke"],["dc.contributor.author","Fromm, Jörg"],["dc.contributor.author","Polle, Andrea"],["dc.contributor.author","Hedrich, Rainer"],["dc.contributor.author","Rennenberg, Heinz"],["dc.contributor.author","Müller, Tobias"],["dc.contributor.author","Ache, Peter"],["dc.date.accessioned","2017-09-07T11:50:44Z"],["dc.date.available","2017-09-07T11:50:44Z"],["dc.date.issued","2012"],["dc.description.abstract","Understanding seasonality and longevity is a major challenge in tree biology. In woody species, growth phases and dormancy follow one another consecutively. In the oldest living individuals, the annual cycle may run for more than 1,000 years. So far, however, not much is known about the processes triggering reactivation from dormancy. In this study, we focused on wood rays, which are known to play an important role in tree development. The transition phase from dormancy to flowering in early spring was compared with the phase of active growth in summer. Rays from wood samples of poplar (Populus × canescens) were enriched by laser microdissection, and transcripts were monitored by poplar whole-genome microarrays. The resulting seasonally varying complex expression and metabolite patterns were subjected to pathway analyses. In February, the metabolic pathways related to flower induction were high, indicating that reactivation from dormancy was already taking place at this time of the year. In July, the pathways related to active growth, like lignin biosynthesis, nitrogen assimilation, and defense, were enriched. Based on “marker” genes identified in our pathway analyses, we were able to validate periodical changes in wood samples by quantitative polymerase chain reaction. These studies, and the resulting ray database, provide new insights into the steps underlying the seasonality of poplar trees."],["dc.identifier.doi","10.1104/pp.112.202291"],["dc.identifier.gro","3147741"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/5130"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0032-0889"],["dc.title","Poplar Wood Rays Are Involved in Seasonal Remodeling of Tree Physiology"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1902"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Plant Physiology"],["dc.bibliographiccitation.lastpage","1917"],["dc.bibliographiccitation.volume","151"],["dc.contributor.author","Luo, Zhi-Bin"],["dc.contributor.author","Janz, Dennis"],["dc.contributor.author","Jiang, Xiangning"],["dc.contributor.author","Göbel, Cornelia"],["dc.contributor.author","Wildhagen, Henning"],["dc.contributor.author","Tan, Yupeng"],["dc.contributor.author","Rennenberg, Heinz"],["dc.contributor.author","Feussner, Ivo"],["dc.contributor.author","Polle, Andrea"],["dc.date.accessioned","2017-09-07T11:49:32Z"],["dc.date.available","2017-09-07T11:49:32Z"],["dc.date.issued","2009"],["dc.description.abstract","Ectomycorrhizas (EMs) alleviate stress tolerance of host plants, but the underlying molecular mechanisms are unknown. To elucidate the basis of EM-induced physiological changes and their involvement in stress adaptation, we investigated metabolic and transcriptional profiles in EM and non-EM roots of gray poplar (Populus × canescens) in the presence and absence of osmotic stress imposed by excess salinity. Colonization with the ectomycorrhizal fungus Paxillus involutus increased root cell volumes, a response associated with carbohydrate accumulation. The stress-related hormones abscisic acid and salicylic acid were increased, whereas jasmonic acid and auxin were decreased in EM compared with non-EM roots. Auxin-responsive reporter plants showed that auxin decreased in the vascular system. The phytohormone changes in EMs are in contrast to those in arbuscular mycorrhizas, suggesting that EMs and arbuscular mycorrhizas recruit different signaling pathways to influence plant stress responses. Transcriptome analyses on a whole genome poplar microarray revealed activation of genes related to abiotic and biotic stress responses as well as of genes involved in vesicle trafficking and suppression of auxin-related pathways. Comparative transcriptome analysis indicated EM-related genes whose transcript abundances were independent of salt stress and a set of salt stress-related genes that were common to EM non-salt-stressed and non-EM salt-stressed plants. Salt-exposed EM roots showed stronger accumulation of myoinositol, abscisic acid, and salicylic acid and higher K+-to-Na+ ratio than stressed non-EM roots. In conclusion, EMs activated stress-related genes and signaling pathways, apparently leading to priming of pathways conferring abiotic stress tolerance."],["dc.identifier.doi","10.1104/pp.109.143735"],["dc.identifier.gro","3147308"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/7448"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/4914"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0032-0889"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Upgrading Root Physiology for Stress Tolerance by Ectomycorrhizas: Insights from Metabolite and Transcriptional Profiling into Reprogramming for Stress Anticipation"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]