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Full-Text Articles in Agriculture

Morphological And Genetic Analysis Of The Root System In Two American Grapevines (Vitis Species), Parinaz Mohtasebi Jan 2023

Morphological And Genetic Analysis Of The Root System In Two American Grapevines (Vitis Species), Parinaz Mohtasebi

MSU Graduate Theses

The North American grapes species Vitis rupestris Scheele and Vitis riparia Michx have been the pillars of rootstock breeding for many decades. Though a large body of viticultural knowledge has been accumulated on their impact on grafted scions, the genetic basis of their root system architecture (RSA) has received limited scientific attention. In this study, I generated and analyzed adventitious root systems from dormant cuttings of 22 V. riparia and 19 V. rupestris accessions, as well as 162 interspecific F1 hybrid progeny from a cross between V. rupestris (♀) and V. riparia (♂). I photographed the roots and then extracted …


Crisis Communication And Public Relations: How Fairs Communicated Cancellations During The Covid-19 Pandemic, Olivia Mckenna Robinson Jan 2023

Crisis Communication And Public Relations: How Fairs Communicated Cancellations During The Covid-19 Pandemic, Olivia Mckenna Robinson

MSU Graduate Theses

The COVID-19 pandemic halted aspects of a traditional fair including the agriculture, home economics, entertainment, and carnival exhibits that were missed by the diverse stakeholders who enjoy the traditions of this industry. This study examined how fairgoers reacted to the news of cancellation and investigated fair managers’ communication decisions. An explanatory sequential (QUANT → QUAL) mixed methods design was used. A survey was conducted asking fairgoers to recall communication strategies and feelings after the communication. A more in-depth focus group with fair managers was hosted to understand how crisis communication was utilized, and if active information seekers versus passive information …


Natural Transmission Of Grapevine Vein Clearing Virus, Matthew Manu Jan 2023

Natural Transmission Of Grapevine Vein Clearing Virus, Matthew Manu

MSU Graduate Theses

More than 60 million tons of grapes are produced annually in the world, making them one of the most widely grown fruit crops. Despite grapes’ economic and health benefits, biotic stressors, such as viruses, cause significant loss to the grape and wine industry. One such virus is grapevine vein clearing virus (GVCV) which seriously threatens grape cultivation in the Midwest region of the United States. This virus has caused the removal of seven commercial vineyards since its discovery in 2004. About 34% of Ampelopsis cordata wild vines are infected with GVCV and serve as a primary inoculum for the spread …


Distribution Patterns Of Allorhizobium Vitis In Missouri Vineyards And Non-Vineyard Soils, Jacquelyn M. Wray Jan 2023

Distribution Patterns Of Allorhizobium Vitis In Missouri Vineyards And Non-Vineyard Soils, Jacquelyn M. Wray

MSU Graduate Theses

Crown gall disease causes significant economic loss to the grape and wine industry. Preventive strategies are most effective for mitigating the loss of grapevines in vineyards, as there is no known cure for this disease. The bacterium Allorhizobium vitis carrying a tumor-inducing (Ti) plasmid is the causative agent. A. vitis bacteria live systemically in the grapevine before causing visible symptoms and can survive in residual plant tissues and soil for more than two years. Diagnostic methods have been developed to detect A. vitis bacteria in grapevines and soil. However, more reliable, specific, and high-throughput diagnostics are still needed for screening …