Müller, Annika

[["dc.bibliographiccitation.firstpage","87"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Flora"],["dc.bibliographiccitation.lastpage","95"],["dc.bibliographiccitation.volume","207"],["dc.contributor.author","Mueller, Annika"],["dc.contributor.author","Leuschner, Christoph"],["dc.contributor.author","Horna, Viviana"],["dc.contributor.author","Zhang, C."],["dc.date.accessioned","2018-11-07T09:15:30Z"],["dc.date.available","2018-11-07T09:15:30Z"],["dc.date.issued","2012"],["dc.description.abstract","The European and American aspen species Populus tremula and P. tremuloides are closely related taxa with very large distribution ranges and high economic importance. Genetic and morphological data are not fully congruent with respect to the question of the systematic relatedness of these sister taxa, pointing either at separate species on the two continents or a single aggregate species with circumarctic distribution. In a replicated growth trial with 1-year-old saplings, we compared about 30 morphological (leaf size, leaf area, leaf numbers, leaf growth, leaf phenology and the ratio of leaves lost to leaves produced) and physiological traits (A(max), quantum yield, carboxylation efficiency, maximum rates of carboxylation and electron transport, leaf dark respiration, leaf conductance, leaf water potential and WUE) with the aim to obtain evidence in support of or against the one-species hypothesis and to identify key determinants of growth in the two aspen taxa. American aspen showed a by 20% higher canopy carbon gain than European aspen which was nearly entirely caused by a larger mean leaf area of P. tremuloides, while differences in mean assimilation rate and the length of the leafy period were of minor importance. Species-specific differences in the onset of leaf abscission in early autumn were identified as main determinants of the size of mean plant leaf area and thus of canopy carbon gain. American aspen with a larger leaf area and C gain possessed by far fewer leaves and side branches than European aspen, but had considerably larger leaves. These morphological and phenological contrasts support the view that the two aspen collectives are indeed different species, what has been questioned recently. However, the large majority of physiological traits is not significantly different between the two species and they are much less variable among the individuals of a species than the morphological traits indicating a conservative inheritance of physiological traits. (C) 2011 Elsevier GmbH. All rights reserved."],["dc.identifier.doi","10.1016/j.flora.2011.11.001"],["dc.identifier.isi","000301910900001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27706"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Gmbh, Urban & Fischer Verlag"],["dc.relation.issn","0367-2530"],["dc.title","Photosynthetic characteristics and growth performance of closely related aspen taxa: On the systematic relatedness of the Eurasian Populus tremula and the North American P. tremuloides"],["dc.title.subtitle","On the systematic relatedness of the Eurasian Populus tremula and the North American P. tremuloides"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","242"],["dc.bibliographiccitation.journal","Biomass and Bioenergy"],["dc.bibliographiccitation.lastpage","250"],["dc.bibliographiccitation.volume","46"],["dc.contributor.author","Mueller, Annika"],["dc.contributor.author","Horna, Viviana"],["dc.contributor.author","Zhang, C."],["dc.contributor.author","Leuschner, Christoph"],["dc.date.accessioned","2018-11-07T09:03:42Z"],["dc.date.available","2018-11-07T09:03:42Z"],["dc.date.issued","2012"],["dc.description.abstract","Populus tremula is a favoured tree species in short-rotation forestry with a recognised large intraspecific variation in productivity. We compared the growth potential of 1-yr-old saplings of four Central European aspen collectives with different climate adaptation on a low-fertility site and searched for growth-determining physiological and morphological traits and their dependence on genetic constitution. Among the 35 investigated traits were photosynthetic capacity and mean assimilation rate, quantum yield and carboxylation efficiency, leaf water potential, leaf phaenology and the ratio of leaves lost to leaves produced (LP ratio), leaf size and total leaf area, axes length growth and canopy carbon gain as an estimate of productivity. The collectives differed by more than 30% in cumulative carbon gain with a large genotype effect, while mean assimilation rate and most photosynthetic and water status traits showed a relatively small intraspecific variation with no significant influence on the variation in C gain. The timing of the beginning of net leaf loss (leaf abscission > leaf production) in August differed between the four collectives and resulted in different maximum leaf areas and LP ratios, which were identified as key factors controlling C gain. Mean assimilation rate, though not related to cumulative C gain, was positively correlated with the light, CO2 and water use efficiencies of photosynthesis. We conclude that genotype selection for high-yielding aspen in short-rotation forestry at low-fertility sites should focus on the parameters leaf phaenology, LP ratio at the end of the growing season, and the resulting total leaf area as key traits. (C) 2012 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.biombioe.2012.08.020"],["dc.identifier.isi","000313307300025"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/24951"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.publisher.place","Oxford"],["dc.relation.conference","1st International Conference on Lignocellulosic Ethanol"],["dc.relation.eventlocation","Copenhagen, DENMARK"],["dc.relation.issn","1873-2909"],["dc.relation.issn","0961-9534"],["dc.title","Different growth strategies determine the carbon gain and productivity of aspen collectives to be used in short-rotation plantations"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","274"],["dc.bibliographiccitation.journal","Biomass and Bioenergy"],["dc.bibliographiccitation.lastpage","283"],["dc.bibliographiccitation.volume","56"],["dc.contributor.author","Müller, Annika"],["dc.contributor.author","Horna, Viviana"],["dc.contributor.author","Kleemann, Frauke"],["dc.contributor.author","Vornam, Barbara"],["dc.contributor.author","Leuschner, Christoph"],["dc.date.accessioned","2018-08-10T16:06:15Z"],["dc.date.available","2018-08-10T16:06:15Z"],["dc.date.issued","2013"],["dc.description.abstract","For investigating genotypic differences in the production potential of Populus tremula L., we grew aspen plants of six full-sib families under optimal water and nutrient conditions and analysed more than 20 physiological and morphological traits with a potential impact on productivity. The six families were produced from controlled crossings of two male and four female trees. Despite genetic distances of 2–28%, the families showed no significant differences in photosynthetic and leaf water status parameters (photosynthetic capacity, leaf water potential and others), even though productivity differed up to twofold between the families. Hence, growth rate was not related to photosynthetic activity but showed a close association with several morphological traits, most closely with the leaf number (L) and total leaf area. Variation in L explained 70% of the growth variation across the six families, and the start of bud burst (BB) correlated with the leaf number (early-starting families produced more leaves). The between-family variation in growth-related morphological traits was much larger than that in physiological traits (coefficient of genetic variation 4–29% vs. 0–4%). Even though the genetic constitution had a significant effect on eight morphological (leaf and root-related) traits, we found no relation between the genetic differences between any two families and the corresponding growth differences. We conclude that the timing of bud burst and the resulting total number of leaves developed are the determinants of growth in P. tremula. Selection programmes should focus on the considerable intraspecific variation in L and BB in order to increase yield."],["dc.identifier.doi","10.1016/j.biombioe.2013.05.013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15255"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.title","Physiological vs. morphological traits controlling the productivity of six aspen full-sib families"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]