Agronomic response of drought-tolerant and Striga-resistant maize cultivars to nitrogen fertilization in the Nigerian Guinea savannahs

In additon to drought and Striga hermonthica parasitism, nitrogen deficiency is a major constraint to maize pro¬duction in the Guinea savannahs of Nigeria. The use of mineral fertilizers is limited because of unavailability and high costs. The use of maize cultivars that perform well under sub-optimal N conditons is therefore desirable. Breeders at IITA have selected maize cultivars that combine tolerance to drought and Striga hermonthica parasit¬ism. This study evaluated six of these cultivars under a range of N application rates and compared these with a widely grown variety, TZB-SR. The study was conducted in Zaria and Samaru Kataf in Kaduna State of Nigeria. Results showed N application significantly reduced days to flowering and increased yield and yield components. Cultivars selected for combined tolerance to drought and Striga recorded lower number of days to flowering under N stress and higher dry matter, higher grain yield, higher number of grains m-2 and higher 500-seed weight at all N rates. This confirms earlier reports that maize cultivars selected for tolerance to drought will perform well under N-limited conditions. Grain yield was significantly associated with dry matter, number of grains m-2 and 500-seed weight at all N levels suggesting that these agronomic traits are significant determinants of maize yield at all N rates. Two cultivars (DT STR SYN-W/IWD C3 SYN and IWD C3 SYN/DT-SYN-1-W) were particularly outstanding at all added N levels probably due to long term improvement for drought tolerance. These two cultivars can be recommended for large-scale demonstration and release to the farmers in the West African savannas

Senegal: Presidential elections 2019 - The shining example of democratic transition immersed in muddy power-politics

Whereas Senegal has long been sold as a showcase of democracy in Africa, including peaceful political alternance, things apparently changed fundamentally with the Senegalese presidentials of 2019 that brought new configurations. One of the major issues was political transhumance that has been elevated to the rank of religion in defiance of morality. It threatened political stability and peace. In response, social networks of predominantly young activists, created in 2011 in the aftermath of the Arab Spring focused on grass-roots advocacy with the electorate on good governance and democracy. They proposed a break with a political system that they consider as neo-colonialist. Moreover, Senegal’s justice is frequently accused to be biased, and the servility of the Constitutional Council which is in the first place an electoral court has often been denounced

The evolving SARS-CoV-2 epidemic in Africa: Insights from rapidly expanding genomic surveillance.

Investment in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) sequencing in Africa over the past year has led to a major increase in the number of sequences that have been generated and used to track the pandemic on the continent, a number that now exceeds 100,000 genomes. Our results show an increase in the number of African countries that are able to sequence domestically and highlight that local sequencing enables faster turnaround times and more-regular routine surveillance. Despite limitations of low testing proportions, findings from this genomic surveillance study underscore the heterogeneous nature of the pandemic and illuminate the distinct dispersal dynamics of variants of concern-particularly Alpha, Beta, Delta, and Omicron-on the continent. Sustained investment for diagnostics and genomic surveillance in Africa is needed as the virus continues to evolve while the continent faces many emerging and reemerging infectious disease threats. These investments are crucial for pandemic preparedness and response and will serve the health of the continent well into the 21st century

The evolving SARS-CoV-2 epidemic in Africa: Insights from rapidly expanding genomic surveillance

INTRODUCTION Investment in Africa over the past year with regard to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) sequencing has led to a massive increase in the number of sequences, which, to date, exceeds 100,000 sequences generated to track the pandemic on the continent. These sequences have profoundly affected how public health officials in Africa have navigated the COVID-19 pandemic. RATIONALE We demonstrate how the first 100,000 SARS-CoV-2 sequences from Africa have helped monitor the epidemic on the continent, how genomic surveillance expanded over the course of the pandemic, and how we adapted our sequencing methods to deal with an evolving virus. Finally, we also examine how viral lineages have spread across the continent in a phylogeographic framework to gain insights into the underlying temporal and spatial transmission dynamics for several variants of concern (VOCs). RESULTS Our results indicate that the number of countries in Africa that can sequence the virus within their own borders is growing and that this is coupled with a shorter turnaround time from the time of sampling to sequence submission. Ongoing evolution necessitated the continual updating of primer sets, and, as a result, eight primer sets were designed in tandem with viral evolution and used to ensure effective sequencing of the virus. The pandemic unfolded through multiple waves of infection that were each driven by distinct genetic lineages, with B.1-like ancestral strains associated with the first pandemic wave of infections in 2020. Successive waves on the continent were fueled by different VOCs, with Alpha and Beta cocirculating in distinct spatial patterns during the second wave and Delta and Omicron affecting the whole continent during the third and fourth waves, respectively. Phylogeographic reconstruction points toward distinct differences in viral importation and exportation patterns associated with the Alpha, Beta, Delta, and Omicron variants and subvariants, when considering both Africa versus the rest of the world and viral dissemination within the continent. Our epidemiological and phylogenetic inferences therefore underscore the heterogeneous nature of the pandemic on the continent and highlight key insights and challenges, for instance, recognizing the limitations of low testing proportions. We also highlight the early warning capacity that genomic surveillance in Africa has had for the rest of the world with the detection of new lineages and variants, the most recent being the characterization of various Omicron subvariants. CONCLUSION Sustained investment for diagnostics and genomic surveillance in Africa is needed as the virus continues to evolve. This is important not only to help combat SARS-CoV-2 on the continent but also because it can be used as a platform to help address the many emerging and reemerging infectious disease threats in Africa. In particular, capacity building for local sequencing within countries or within the continent should be prioritized because this is generally associated with shorter turnaround times, providing the most benefit to local public health authorities tasked with pandemic response and mitigation and allowing for the fastest reaction to localized outbreaks. These investments are crucial for pandemic preparedness and response and will serve the health of the continent well into the 21st century

Building the plane as you fly it: young diasporan engagement in Ethiopian development

This thesis explores the relationship between identity, social interaction, and social practice, through a case study of young diasporans of Ethiopian origin (YDEOs) from North America and their engagements in Ethiopian development initiatives. Specifically, I examine the ways in which people of Ethiopian descent born and/or raised in Canada and the U.S. construct a diasporic identity and engage with Ethiopian development initiatives through a mutually constitutive process. My methods were qualitative and involved conducting semi-structured in-depth interviews with 55 YDEOs and attending 8 community events in Toronto, Washington, D.C., and Addis Ababa. All of the YDEOs I interviewed had actively engaged in initiatives (based in North America or Ethiopia) intended to contribute towards the social, political, and/or economic development of Ethiopia. Their initiatives included fundraising events, establishing local NGOs, volunteer missions, and taking professional positions within the Ethiopian development sector, among others. Utilising an interactionist theoretical framework, I unpack YDEO motivations for engaging in Ethiopian development, the nature of the development activities themselves, and the ways in which these experiences have shaped YDEO relationships, identities, and trajectories in life so far. Engaging in Ethiopian development was rarely expressed as an extension of a pre-existing sense of Ethiopian patriotism; rather, YDEOs used these practices to explore, test, or build a sense of connection to their country of origin. Further, the development framework made it possible for them to forge a relationship that also resonated with their other social identities, and could even be leveraged to further other personal and professional goals. YDEO engagements in Ethiopian development were not simply interventions; they were fundamentally social processes defined by social interactions. In the process of organising fundraising events, volunteering at orphanages, and working on project reports, YDEOs were also building personal connections, gaining social capital, and redefining attitudes towards their families, communities, development, and Ethiopia itself. This thesis contributes an in-depth and critical analysis of the diaspora/development nexus – a nexus that emerges as a contested space, where people act and are acted upon, where identities are reified and transformed, and where institutions and social structures are both strengthened and challenged. The insights from migrant descendant experiences, such as YDEOs, highlights the ways in which diasporic identities take shape and are imbued with meaning through social practice, and how these practices are connected to broader human psychosocial needs, aspirations, and behaviours.</p

Building the plane as you fly it: young diasporan engagement in Ethiopian development

This thesis explores the relationship between identity, social interaction, and social practice, through a case study of young diasporans of Ethiopian origin (YDEOs) from North America and their engagements in Ethiopian development initiatives. Specifically, I examine the ways in which people of Ethiopian descent born and/or raised in Canada and the U.S. construct a diasporic identity and engage with Ethiopian development initiatives through a mutually constitutive process. My methods were qualitative and involved conducting semi-structured in-depth interviews with 55 YDEOs and attending 8 community events in Toronto, Washington, D.C., and Addis Ababa. All of the YDEOs I interviewed had actively engaged in initiatives (based in North America or Ethiopia) intended to contribute towards the social, political, and/or economic development of Ethiopia. Their initiatives included fundraising events, establishing local NGOs, volunteer missions, and taking professional positions within the Ethiopian development sector, among others. Utilising an interactionist theoretical framework, I unpack YDEO motivations for engaging in Ethiopian development, the nature of the development activities themselves, and the ways in which these experiences have shaped YDEO relationships, identities, and trajectories in life so far. Engaging in Ethiopian development was rarely expressed as an extension of a pre-existing sense of Ethiopian patriotism; rather, YDEOs used these practices to explore, test, or build a sense of connection to their country of origin. Further, the development framework made it possible for them to forge a relationship that also resonated with their other social identities, and could even be leveraged to further other personal and professional goals. YDEO engagements in Ethiopian development were not simply interventions; they were fundamentally social processes defined by social interactions. In the process of organising fundraising events, volunteering at orphanages, and working on project reports, YDEOs were also building personal connections, gaining social capital, and redefining attitudes towards their families, communities, development, and Ethiopia itself. This thesis contributes an in-depth and critical analysis of the diaspora/development nexus â a nexus that emerges as a contested space, where people act and are acted upon, where identities are reified and transformed, and where institutions and social structures are both strengthened and challenged. The insights from migrant descendant experiences, such as YDEOs, highlights the ways in which diasporic identities take shape and are imbued with meaning through social practice, and how these practices are connected to broader human psychosocial needs, aspirations, and behaviours.</p

Response of early maturing maize landraces and improved varieties to moisture deficit and sufficient water supply

In drought-affected maize production zones with short growing periods, the development and use of early maturing drought-tolerant cultivars can stabilize maize production. We evaluated 10 improved and 25 farmers' early maturing maize varieties under moisture deficit and well-watered conditions for 2 years to identify suitable genetic materials for breeding drought-tolerant cultivars. The varieties exhibited significant differences in grain yield and other traits under both moisture deficit and well-watered conditions. Changes in the rank order of the varieties for grain yield was not significant across the different levels of moisture supply in this study. Grain yield was significantly correlated with days to anthesis, days to silking, plant height, ear height, ear number and anthesis–silking interval (ASI) under the two irrigation treatments and with leaf death scores under moisture deficit, suggesting that the common traits were beneficial in maximizing grain yield under both sufficient water supply and moisture deficit. Grain yield and the traits significantly correlated with it differentiated the early maturing maize varieties into two distinct groups under well-watered condition and moisture deficit. The improved varieties were superior to the farmers' varieties in grain yield and other traits under moisture deficit, possibly due to selection of their progenitors for improved performance in multiple locations. We found some farmers' and improved varieties with similar yield potential and flowering time under well-watered conditions but with marked differences in grain yield and other traits under moisture deficit. Use of such promising landraces that would also be invaluable sources of desirable farmers-preferred end-use quality traits in combination with promising improved varieties as breeding materials could enhance the genetic grain from selection for drought tolerance in early maize.</jats:p