Factors Affecting the Vineyard Populational Diversity of Plasmopara viticola

Boso, Susana,Gago, Pilar,Santiago, Jose-Luis,de la Fuente, Maria,Martinez, Maria-Carmen The Korean Society of Plant Pathology 2019 Plant Pathology Journal Vol.35 No.2

Vitis vinifera is very susceptible to downy mildew (Plasmopara viticola). A number of authors have suggested different genetic populations of this fungus exist in Europe, each showing a different degree of virulence. Work performed to date indicates this diversity to be the result of different factors. In areas where gene flow is greater and recombination more frequent, the diversity of P. viticola appears to be wider. In vineyards isolated by geographic barriers, a race may become dominant and produce clonal epidemics driven by asexual reproduction. The aim of the present work was to identify the conditions that influence the genetic diversity of P. viticola populations in the vineyards of northwestern Spain, where the climatic conditions for the growth of this fungus are very good. Vineyards situated in a closed, narrow valley of the interior, in more open valleys, and on the coast were sampled and the populations of P. viticola detected were differentiated at the molecular level through the examination of microsatellite markers. The populations of P. viticola represented in primary and secondary infections were investigated in the same way. The concentration of airborne sporangia in the vegetative cycle was also examined, as was the virulence of the different P. viticola populations detected. The epidemiological characteristics of the fungus differed depending on the degree of isolation of the vineyard, the airborne spore concentration, and on whether the attack was primary or secondary. Strong isolation was associated with the appearance of dominant fungal races and, therefore, reduced populational diversity.

Factors Affecting the Vineyard Populational Diversity of Plasmopara viticola

Susana Boso,Pilar Gago,José-Luis Santiago,María de la Fuente,María-Carmen Martínez 한국식물병리학회 2019 Plant Pathology Journal Vol.35 No.2

Vitis vinifera is very susceptible to downy mildew (Plasmopara viticola). A number of authors have suggested different genetic populations of this fungus exist in Europe, each showing a different degree of virulence. Work performed to date indicates this diversity to be the result of different factors. In areas where gene flow is greater and recombination more frequent, the diversity of P. viticola appears to be wider. In vineyards isolated by geographic barriers, a race may become dominant and produce clonal epidemics driven by asexual reproduction. The aim of the present work was to identify the conditions that influence the genetic diversity of P. viticola populations in the vineyards of northwestern Spain, where the climatic conditions for the growth of this fungus are very good. Vineyards situated in a closed, narrow valley of the interior, in more open valleys, and on the coast were sampled and the populations of P. viticola detected were differentiated at the molecular level through the examination of microsatellite markers. The populations of P. viticola represented in primary and secondary infections were investigated in the same way. The concentration of airborne sporangia in the vegetative cycle was also examined, as was the virulence of the different P. viticola populations detected. The epidemiological characteristics of the fungus differed depending on the degree of isolation of the vineyard, the airborne spore concentration, and on whether the attack was primary or secondary. Strong isolation was associated with the appearance of dominant fungal races and, therefore, reduced populational diversity.

THE IMPACT OF INTERNATIONAL ENTREPRENEURIAL-ORIENTED BEHAVIORS ON REGIONAL EXPANSION: EVIDENCE FROM A DEVELOPING ECONOMY

Nathaniel Boso,Magnus Hultman,Pejvak Oghazi 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7

The growing pace of market globalization has enabled firms to find it increasingly attractive to exploit growth opportunities abroad. To this end, predicting firms’ success and growth in foreign markets has become an important issue to international business researchers and managers. The international business literature suggests that different internal firm and foreign market specific environment factors drive internationalization of firms including firms’ structure, strategy, orientations, capabilities and nature of foreign market competition. Researchers interested in the field of international entrepreneurship have also given attention to firms’ international entrepreneurial orientation (IEO) as a potential driver of firms’ internationalization behavior, with few recent studies reporting investigations into the relationship between IEO and internationalization scope. The entrepreneurship literature suggests that variations in entrepreneurial behaviors may lead to exploitation of “new entry” (Oviatt & McDougall, 2005; Cavusgil & Knight, 2015). Within the international entrepreneurship discipline, international new entry is construed to entail identification and exploitation of new product-market opportunities abroad, or a pursuit of internationalization scope (Dai et al., 2014). Internationalization scope is defined as the process of seeking new market opportunities across multiple foreign markets, and is operationalized variously with indicators that tap the percentage of overseas revenue to total revenue, and the number of foreign countries and geographic regions from which a firm receives its sales. Thus, internationalization scope is viewed to be inherent and essential to the exhibition of an IEO, and may be driven by firms’ entrepreneurial proclivity. While a few studies have looked at how IEO impacts percentage of revenue firms obtain from foreign markets (Dai et al., 2014), little studies have studied how and when IEO drives regional expansion. This is notwithstanding the fact that traditional internationalization theory points to regional expansion as an antecedent to global expansion. Indeed, international business scholars have argued that a combination of increasing informal exporting activities, rising liberalization of regional economies, colonial bias, regional economic blocs and the emergence of middle class in many regional markets has created opportunities for firms to internationalize within neighboring geographical regions. Additionally, it has been argued that the benefits and costs of regional protection can motivate firms to pursue regionalization strategy as an antecedent or an alternative to globalization strategy. In drawing insights from earlier works, therefore, the present study focuses on the regional expansion of exporting firms in a Sub-Sahara African economy – Ghana, and examines how international entrepreneurial-oriented behaviors drive the firms’ intra-Africa expansion. African markets are noted for their diversity in national laws, cultures, geography, and infrastructural development. Particularly relevant to internationalizing African firms is the diversity and imperfection of marketing channels across African markets. An important implication for African firms, therefore, is how they can leverage their comparative advantage of handling diversity and imperfection of marketing channels in their home African market to successfully compete in overseas host markets with similar conditions. Accordingly, we further empirically examine how a firm’s ability to manage heterogeneous and imperfect marketing channels moderates the effect of IEO behaviors on regional expansion. We posit that the extent to which firms develop managerial and organizational capabilities to successfully compete in conditions of high market channel diversity and imperfection is a major contingency factor that can help explain when entrepreneurial behaviors influence regional expansion. By empirically examining these questions, this study brings new insights to IEO research by showing that IEO behaviors are differentially related to regionalization strategy depending on firms’ capability to manage heterogeneous and imperfect regional marketing channels. Specifically, findings from our study of small and medium sized firms in Ghana doing business in regional African markets show that regional expansion increases when levels of product innovation intensity, competitive aggressiveness and autonomous behavior are high and when regional channel management capability increases in magnitude. Additionally, the study provides evidence to show that increases in risking-taking behavior decrease regional expansion when regional channel management capability is high. Furthermore, the study demonstrates that although product innovation novelty and proactiveness are directly related to regional expansion their effects are cancelled out when levels of regional channel management capability are high.

A MULTI-FACETED EXAMINATION OF THE EXPORT PRODUCT ADAPTATION—CUSTOMER VALUE CREATION RELATIONSHIP

Eleni Tsougkou,John W. Cadogan,Ian R. Hodgkinson,Jο?ο S. Oliveira,Tommi Laukkanen,Vicky M. Story,Nahid Yazdani,Nathaniel Boso 글로벌지식마케팅경영학회 2018 Global Marketing Conference Vol.2018 No.07

Researchers have yet to investigate whether it is beneficial for exporters to engage in greater levels of product adaptation in their export operations, or whether there is some limit to the amount of adaptation exporters should engage in. We posit that customer value creation, a central marketing concept and a mechanism to achieving market and financial goals in business to business markets, is a core outcome of export product adaptation activities. In order to explore the routes by which adaptation may shape export customer value creation, we adopt a multi-faceted conceptualization of firm-level product adaptation, comprising export product adaptation (i) quantity, (ii) intensity and (iii) novelty. Drawing on survey data from 249 Finnish exporters involved in business-to-business activities, we find evidence to support the claim that the impact of export product adaptation on export customer value creation is contingent on various factors, and we identify instances where greater adaptation is beneficial for export customer value creation, and instances where greater export product adaptation is potentially harmful for export customer value creation.