ABSTRACT
Activities within the sharing economy (SE) are in a precarious situation due to the Covid-19 pandemic. Even though the SE is considered a disruptive phenomenon, especially in the accommodation and transport sectors, the Covid-19 has raised concerns about its survivability. Thousands of people have lost their jobs, the value of SE firms has dropped, and many service providers have no other option but to stop working. Understanding the effect of the Covid-19 pandemic on the SE sector is therefore essential. The objective of this study is therefore to examine the effect of the Covid-19 on sharing economy activities. We have used various publications-such as news articles, TV news items, YouTube videos, and blog posts-as data sources for this study purpose. Through content analysis, the study shows how the SE phenomenon is coping with the changing environment caused by the Covid-19. We analyzed the SE sector mainly from the perspective of four stakeholders: SE firms, service providers, service receivers (customers), and regulatory bodies. We explored the SE phenomenon based mainly on the following themes: anxiety, cancelation, job loss, income reduction, hygiene and safety, overcoming strategy, and outcomes. Based on the findings, we point out implications and avenues for future research.
ABSTRACT
BACKGROUND: Salinity is a stressful environmental factor that limits the productivity of crop plants, and roots form the major interface between plants and various abiotic stresses. Rice is a salt-sensitive crop and its polyploid shows advantages in terms of stress resistance. The objective of this study was to investigate the effects of genome duplication on rice root resistance to salt stress. RESULTS: Both diploid rice (HN2026-2x and Nipponbare-2x) and their corresponding tetraploid rice (HN2026-4x and Nipponbare-4x) were cultured in half-strength Murashige and Skoog medium with 150 mM NaCl for 3 and 5 days. Accumulations of proline, soluble sugar, malondialdehyde (MDA), Na(+) content, H(+) (proton) flux at root tips, and the microstructure and ultrastructure in rice roots were examined. We found that tetraploid rice showed less root growth inhibition, accumulated higher proline content and lower MDA content, and exhibited a higher frequency of normal epidermal cells than diploid rice. In addition, a protective gap appeared between the cortex and pericycle cells in tetraploid rice. Next, ultrastructural analysis showed that genome duplication improved membrane, organelle, and nuclei stability. Furthermore, Na(+) in tetraploid rice roots significantly decreased while root tip H(+) efflux in tetraploid rice significantly increased. CONCLUSIONS: Our results suggest that genome duplication improves root resistance to salt stress, and that enhanced proton transport to the root surface may play a role in reducing Na(+) entrance into the roots.
