Höller, Martin Georg: Phenotypic analysis of different Silphium perfoliatum L. accessions and evaluation as a renewable resource for material use. - Bonn, 2022. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5-68687
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5-68687,
author = {{Martin Georg Höller}},
title = {Phenotypic analysis of different Silphium perfoliatum L. accessions and evaluation as a renewable resource for material use},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2022,
month = nov,

note = {Cup plant (Silphium perfoliatum L.) is a promising alternative to silage maize as an energy crop for biogas production and a potential raw material for the industry. This non-food perennial from the US possesses a highly ecological value due to its long blooming period, ability to grow in low-input agriculture and positive influence on soil structure. This thesis analyzes five cup plant populations for their phenotype as a starting point for further breeding programs (I). Additionally, the biomass was analyzed for the use as a renewable raw material for the paper and building industry (II, III).
Comprehensive assessment of five cup plant populations for their biomass and phenotype parameters revealed phenotypic variations. Genetic structure and phylogeny analyses showed that all the plants belong to the same gene pool and share a common ancestry. Four out of five populations demonstrate a low genetic differentiation, whereas the fifth population represents a clear example of population stratification. To start a successful domestication and breeding of this new high-yielding perennial crop, a broader base of genetic diversity needs to be ensured and complemented by innovative breeding strategies, driven by molecular genetics and genomic approaches. While the demand for paper and packaging material is increasing, industry and consumers are searching for more sustainable raw materials aside from wood. This thesis evaluates three non-wood perennials to find alternative raw materials for the paper and pulp industry. Biomass of cup plant, Sida hermaphrodita (L.) Rusby and meadow hay were analyzed for their fibre morphology and use as paper feedstock. Hand-sheets with different pulp blends of birch and one of the three raw materials were made, and paper properties were measured. For the biomass of cup plant, Virginia mallow and meadow hay, fibre lengths of 0.9, 1.3, and 0.5 mm were measured. Therefore, all perennial plant materials have fibre lengths comparable to hardwoods. Meadow hay blends containing 50% and 75% birch pulp, generated higher paper strength when compared to the pure birch paper. The paper strength of cup plant and Virginia mallow blends is comparable to the strength of the birch control. Biomass for non-food applications is considered as a substitute for petroleum-based materials such as expanded polystyrene (EPS). This thesis analyzes physical properties of an EPS containing commercial bonded leveling compound (BLC), which was substituted with cup plant biomass. The measured pore size of the parenchyma cells is comparable to the size of the EPS pores. The compression strength of 0.92 N mm-2 and a thermal conductivity of 84 mW m-1 K-1 were analyzed and deemed comparable to the commercial BLC.},

url = {https://hdl.handle.net/20.500.11811/10441}

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