The primary aims of this dissertation were to (1) identify and characterize the water-gap complex in seeds of Geraniaceae, (2) investigate its role in physical dormancy (PY) break and (3) develop a new classification system for water-gap complexes in seeds of angiosperms. The winter annuals Geranium carolinianum and G. dissectum were selected as the main representative species for the study, and seeds of an additional 29 species from the Geraniaceae were used to compare the water-gap complex within the family. A new classification system for water-gap complexes in species with PY was developed by comparing the morpho-anatomical features of PY seeds and fruits of 16 families. The water-gap complex of G. carolinianum was identified as a micropyle-hinged valve gap complex, and only a slight morpho-anatomical variation was observed within the family. Ontogenetic studies of the seed coat of G. carolinianum revealed that the water-gap region of Geraniaceae develops as an entity of the micropyle. The timing of seed germination with the onset of autumn can be explained by PY-breaking processes involving (a) two-temperature-dependent steps in G. carolinianum, and (b) one or two moisture-dependent step(s) along with the inability to germinate under high temperatures in G. dissectum. Step-I and step-II in PY-breaking of G. carolinianum are controlled by chemical and physical processes, respectively. This study indicates the feasibility of applying the developed thermal time model to predict or manipulate sensitivity induction in seeds with two-step PY-breaking processes. The model is the first and the most detailed one yet developed for sensitivity induction in PY-break. Based on the morpho-anatomical features, three basic water-gap complexes (types I, II and III) were identified in species with PY in 16 families. Depending on the number of openings involved in initial imbibition, the water-gap complexes were subdivided into simple and compound. The new classification system enables the understanding of relationships between water-gap complexes of taxonomically unrelated species with PY.

This paper explores how influencers can be categorised using a self-administered questionnaire. In doing so, the study can contribute to an understanding of the phenomenon that is more extensive than what previous research has attributed. The focus of this paper is on how influencers can be better understood for the benefit of public relations (PR), marketing, and communication. The purpose of this project is to investigate whether the term influencers (short for social media influencers) are defined by scholars in a similar fashion to how the study sample categorises influencers. Thus, the research question of the study is to examine if the study sample finds the term influencer applicable to the five suggested categories that are stated in the survey. The results from this study show that scholars commonly confine the phenomenon of influencers to bloggers, vloggers, and instagrammers. However, the results from the survey indicate that the study sample has a broader perception of the phenomenon. According to the participants, all suggested categories are fitting the term influencer, namely: blogger/vlogger/instagrammer, celebrity, athlete, entrepreneur, politician. Although the latter, politician, is deemed the least fitting category. Thus, the findings in the study show that there is a discrepancy between the public perception of how to define influencers and previous research in the field. This implicates that public relation practitioners need to rethink how they perceive and apply influencer marketing. Using influencers for marketing purposes requires organisations to execute a thorough selection process to ensure a suitable partnership.