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Dagne Wegary Gissa

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Dagne Wegary Gissa
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Dagne Wegary Gissa

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Now showing 1 - 10 of 12
  • Estimation of general and specific combining ability effects for quality protein maize inbred lines
    (SCIENCEDOMAIN international, 2022) Goshime Muluneh Mekasha; Chere, A.T.; Ali, H.M.; Dagne Wegary Gissa; Solomon Admassu Seyoum
    Publication
  • Exploring forgotten opportunity: white lupin development for food, feed, cash, health, and soil fertility management in Ethiopia
    (Taylor and Francis, 2020) Atnaf, M.; Dagne Wegary Gissa; Tesfaye, K.; Kifle, D.; Mazengia, Y.; Ayalew, B.; Melak, A.; Jaleta, M.
    Publication
  • Determinants of smallholder farmers' hybrid maize adoption in the drought prone Central Rift Valley of Ethiopia
    (Academic Journals, 2014) Beshir, B.; Dagne Wegary Gissa
    This paper examines the factors influencing smallholder farmers’ adoption decision of hybrid maize in drought prone Central Rift Valley (CRV) of Ethiopia. The analysis is based on data collected through a questionnaire survey of 277 randomly selected maize grower farm household heads. Binary response Logit model was employed in the data analysis. Hybrid maize adoption in the CRV was found to be influenced by age, years of formal education, farmland size, the proportion of farmland allocated to maize, frequency of extension visit, grain market distance and altitude. Extension visit was negatively associated with hybrid maize adoption contrary to the prevailing beliefs and the earlier findings. Extension workers have been promoting open pollinated varieties (OPVs) maize since the OPVs have been more common in drought prone area though the farmers in the CRV also producing hybrids. Even though the prevailing maize hybrids have essentially been released for high potential areas, the production of these hybrids is currently expanding in the CRV where it is grown by 30% of the farmers. Likewise, hybrid maize adoption in this area offers better opportunity for private seed companies’ involvement in the seed provision of adapted hybrids. A paradigm shift in the maize breeding efforts and extension service on hybrid for drought prone areas is commendable in order to enhance the food security of smallholder farmers in the CRV.
    Publication
  • Curriculum and modules for quality protein maize (QPM) training
    (CIMMYT, 2017) Chere, A.T.; Kelemu, K.; Tadesse, A.; Dagne Wegary Gissa
    This QPM course curriculum has been prepared to acquaint ATVET students on the production and benefit of quality protein maize. It is presented under three competencies describe the basic features of QPM (genetics, history and nutritional benefits of QPM); characteristics and adaptation of QPM varieties released in Ethiopia; and QPM seed maintenance procedures and preventing grain contamination. By learning this course, the graduates can get the wisdom and means to stand against the pervasive menace of undernutrition in Ethiopia using a very cheap and simple approach, biofortification.
    Publication
  • A quality protein maize (QPM) manual for agricultural extension in Ethiopia
    (CIMMYT, 2017) Chere, A.T.; Kelemu, K.; Tadesse, A.; Dagne Wegary Gissa
    This manual introduces the key features of QPM, its nutritional benefits and importance, and techniques of production. It gives an updated information about the QPM varieties that are available for commercial production and their agro-ecological adaptation areas in the country, together with the agronomic practices required for grain and seed production. It also include a brief accounts of management of the most important pests attacking maize. The manual has been prepared to assist agricultural extension staff at grassroots level to train and advice farmers by explaining in simple terms about QPM technology and its nutritional benefits, and to concisely describe production techniques. It also enables to communicate a uniform and consistent messages to farmers and consumers in training and field days across the country.
    Publication
  • Molecular genetic diversity and population structure of Ethiopian white lupin landraces: implications for breeding and conservation
    (Public Library of Science, 2017) Atnaf, M.; Yao, N.; Kyalo, M.; Kifle, D.; Dagne Wegary Gissa; Kassahun Tesfaye
    White lupin is one of the four economically important species of the Lupinus genus and is an important grain legume in the Ethiopian farming system. However, there has been limited research effort to characterize the Ethiopian white lupin landraces. Fifteen polymorphic simple sequence repeat (SSR) markers were used to assess the genetic diversity and population structure of 212 Ethiopian white lupin (Lupinus albus) landraces and two genotypes from different species (Lupinus angustifolius and Lupinus mutabilis) were used as out-group. The SSR markers revealed 108 different alleles, 98 of them from 212 landraces and 10 from out-group genotypes, with an average of 6.5 alleles per locus. The average gene diversity was 0.31. Twenty eight landraces harbored one or more private alleles from the total of 28 private alleles identified in the 212 white lupin accessions. Seventy-seven rare alleles with a frequency of less than 5% were identified and accounted for 78.6% of the total alleles detected. Analysis of molecular variance (AMOVA) showed that 92% of allelic diversity was attributed to individual accessions within populations while only 8% was distributed among populations. At 70% similarity level, the UPGMA dendrogram resulted in the formation of 13 clusters comprised of 2 to 136 landraces, with the out-group genotypes and five landraces remaining distinct and ungrouped. Population differentiation and genetic distance were relatively high between Gondar and Ethiopian white lupin populations collected by Australians. A model-based population structure analysis divided the white lupin landraces into two populations. All Ethiopian white lupin landrace populations, except most of the landraces collected by Australians (77%) and about 44% from Awi, were grouped together with significant admixtures. The study also suggested that 34 accessions, as core collections, were sufficient to retain 100% of SSR diversity. These accessions (core G-34) represent 16% of the whole 212 Ethiopian white lupin accessions and populations from West Gojam, Awi and Australian collections contributed more accessions to the core collection.
    Publication
  • Genetic variation and population structure of maize inbred lines adapted to the mid-altitude sub-humid maize agro-ecology of Ethiopia using single nucleotide polymorphic (SNP) markers
    (BioMed Central, 2017) Tadesse, B.; Semagn, K.; Das, B.; Olsen, M.; Labuschagne, M.; Regasa, M.W.; Dagne Wegary Gissa; Azmach, G.; Ogugo, V.; Keno, T.; Abebe, B.; Chibsa, T.; Menkir, A.
    Molecular characterization is important for efficient utilization of germplasm and development of improved varieties. In the present study, we investigated the genetic purity, relatedness and population structure of 265 maize inbred lines from the Ethiopian Institute of Agricultural Research (EIAR), the International Maize and Wheat Improvement Centre (CIMMYT) and the International Institute of Tropical Agriculture (IITA) using 220,878 single nucleotide polymorphic (SNP) markers obtained using genotyping by sequencing (GBS). Only 22% of the inbred lines were considered pure with <5% heterogeneity, while the remaining 78% of the inbred lines had a heterogeneity ranging from 5.1 to 31.5%. Pairwise genetic distances among the 265 inbred lines varied from 0.011 to 0.345, with 89% of the pairs falling between 0.301 and 0.345. Only <1% of the pairs had a genetic distance lower than 0.200, which included 14 pairs of sister lines that were nearly identical. Relative kinship analysis showed that the kinship coefficients for 59% of the pairs of lines was close to zero, which agrees with the genetic distance estimates. Principal coordinate analysis, discriminant analysis of principal components (DAPC) and the model-based population structure analysis consistently suggested the presence of three groups, which generally agreed with pedigree information (genetic background). Although not distinct enough, the SNP markers showed some level of separation between the two CIMMYT heterotic groups A and B established based on pedigree and combining ability information. The high level of heterogeneity detected in most of the inbred lines suggested the requirement for purification or further inbreeding except those deliberately maintained at early inbreeding level. The genetic distance and relative kinship analysis clearly indicated the uniqueness of most of the inbred lines in the maize germplasm available for breeders in the mid-altitude maize breeding program of Ethiopia. Results from the present study facilitate the maize breeding work in Ethiopia and germplasm exchange among breeding programs in Africa. We suggest the incorporation of high density molecular marker information in future heterotic group assignments.
    Publication
  • CIMMYT’s contribution to capacity building in Ethiopia, 2008-2016
    (CIMMYT, 2016) Dagne Wegary Gissa; Chere, A.T.; Abeyo Bekele Geleta
    Publication
  • Maize variety options for Africa: Ethiopia
    (CIMMYT, 2015) Abate, T.; Dagne Wegary Gissa; Bogale, G.; Keno, T.
    Maize enjoys the largest and fast growing production among all cereals in Ethiopia. Frequent drought is a major abiotic constraint to maize production in this country.
    Publication