Maass, Brigitte L.

[["dc.bibliographiccitation.firstpage","115"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Genetic Resources and Crop Evolution"],["dc.bibliographiccitation.lastpage","131"],["dc.bibliographiccitation.volume","55"],["dc.contributor.author","Tamiru, Muluneh"],["dc.contributor.author","Becker, Heiko C."],["dc.contributor.author","Maass, Brigitte L."],["dc.date.accessioned","2018-11-07T11:18:34Z"],["dc.date.available","2018-11-07T11:18:34Z"],["dc.date.issued","2008"],["dc.description.abstract","Yam (Dioscorea spp.) is widely grown in many parts of Ethiopia and plays a vital role in local subsistence. Nevertheless, its diversity has not been studied in detail. A survey covering 339 farm households and eight districts was conducted in the major yam growing regions of Southern Ethiopia to investigate the diversity and distribution of yam landraces using structured and semi-structured questionnaires. A total of 37 named landraces were recorded, with a range from one to six (mean 2.9) on individual farms. Farmers' decisions regarding the number and type of landraces maintained was influenced by tolerance of the landraces to drought, their maturity time and market demand. Most landraces had limited abundance and distribution, and only a few dominant landraces were widely grown. There was also variation amongst districts with respect to diversity, distribution and abundance of the landraces found. In the majority of the localities surveyed, farmers reported a decreasing trend in the number of landraces maintained on individual farms and in the overall yam production. Besides, in those limited areas where yam production is expanding, farmers are increasingly relying on a few selected landraces that mature early. Findings of this study suggest that local farmers in Wolayita and Gamo-Gofa zones maintain considerable yam diversity that remains to be further explored for sustainable utilization and conservation of the available genetic resources."],["dc.identifier.doi","10.1007/s10722-007-9219-4"],["dc.identifier.isi","000252296200013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/55068"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0925-9864"],["dc.title","Diversity, distribution and management of yam landraces (Dioscorea spp.) in Southern Ethiopia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1675"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Journal of the Science of Food and Agriculture"],["dc.bibliographiccitation.lastpage","1685"],["dc.bibliographiccitation.volume","88"],["dc.contributor.author","Tamiru, Muluneh"],["dc.contributor.author","Maass, Brigitte L."],["dc.contributor.author","Pawelzik, Elke"],["dc.date.accessioned","2018-11-07T11:12:09Z"],["dc.date.available","2018-11-07T11:12:09Z"],["dc.date.issued","2008"],["dc.description.abstract","BACKGROUND: Studies on composition and functional properties in germplasm collections are important in determining their diversity and suitability for food and non-food applications. The diversity in 65 yam accessions collected from Southern Ethiopia and belonging largely to a yet unknown species and to Dioscorea bulbifera L. (aerial yam) was analyzed based on protein, starch and amylose contents, and pasting properties of tuber flour, applying descriptive and multivariate statistics. RESULT: Starch content varied from 65.2% to 76.6% dry matter, while the protein content range was 6.4-13.4% dry matter. Amylose represented between 7.1% and 30.6% of the starch fraction, and was negatively correlated (P < 0.01) with starch content. UPGMA clustering and principal component analysis clearly distinguished aerial yam from those accessions with underground tubers. The first four principal components accounted for 78% of the total variability, and were highly correlated with pasting parameters. CONCLUSION: The extent of diversity detected among accessions studied showed scope for improving the crop through selection of landraces with desirable characteristics. Similar investigations on tubers grown under different environmental conditions and additional data on physicochernical properties of isolated starch will be useful in evaluating the potential of yam for food and non-food applications. (c) 2008 Society of Chemical Industry."],["dc.identifier.doi","10.1002/jsfa.3263"],["dc.identifier.isi","000258097600001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53598"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","John Wiley & Sons Ltd"],["dc.relation.issn","0022-5142"],["dc.title","Characterizing diversity in composition and pasting properties of tuber flour in yam germplasm (Dioscorea spp.) from Southern Ethiopia"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1744"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Crop Science"],["dc.bibliographiccitation.lastpage","1753"],["dc.bibliographiccitation.volume","47"],["dc.contributor.author","Tamiru, Muluneh"],["dc.contributor.author","Becker, Heiko C."],["dc.contributor.author","Maass, Brigitte L."],["dc.date.accessioned","2018-11-07T11:00:57Z"],["dc.date.available","2018-11-07T11:00:57Z"],["dc.date.issued","2007"],["dc.description.abstract","Yam (Dioscorea spp.) is widely cultivated in southern Ethiopia, where farmers maintain many named landraces. Nevertheless, little is known about their diversity and species identity. In this study, amplified fragment length polymorphism (AFLP) markers were used to investigate the genetic diversity in 48 yam accessions from Ethiopia, and to assess their relatedness to yam species commonly cultivated in West Africa such as D. alata L., D. bulbifera L., D. cayenensis Lam., and D. rotundata Poir. Ten AFLP primer combinations generated 900 fragments, of which 97% were polymorphic. Cluster and principal coordinate analyses revealed that the Ethiopian accessions are distinct from the Dioscorea species widely cultivated in West Africa. A separate analysis of the Ethiopian accessions gave six clusters that represented the various maturity groups and the non-flowering accession in the collection. Analysis of molecular variance (AMOVA) showed that 81% of the variation detected was found within collecting areas, while the variation among collecting areas contributed only 19%. The groups detected by AFLP markers were highly consistent with the local yam classification system and also reflected the main structure of morphological diversity."],["dc.identifier.doi","10.2135/cropsci2006.11.0719"],["dc.identifier.isi","000248582400048"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/51040"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Crop Science Soc Amer"],["dc.relation.issn","0011-183X"],["dc.title","Genetic diversity in yam germplasm from Ethiopia and their relatedness to the main cultivated Dioscorea species assessed by AFLP markers"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]