I. Vavilovn, "The origin, variation, immunity and breeding of cultivated plants," Chron. Bot., vol. 13, pp. 1-366, 1951.
 K. Assefa, A. Merker, and H. Tefera, "Qualitative trait variation in tef [Eragrostis tef (Zucc.) Trotter] germplasm from western and southern Ethiopia," Euphytica, vol. 127, pp. 399-410, 2002.
 T. Ebba, "Tef (Eragrostis tef). The cultivation, usage and some of its known diseases and insect pests, Part I. Expt. Sta. Bull." vol. 60, ed Addias Ababa, Ethiopia: Haile Sellassie I University (Now Addis Ababa University) Pblshing House, 1969.
 S. Ketema, Tef (Eragrostis tef). breeding, agronomy, genetic resources, utilization and role in Ethiopian agriculture. Addis Ababa, Ethiopia: IAR, 1993.
 National Research Council, National science education standards. Washington, DC: The National Academies Press, 1996.
 Central Statistical Authority (CSA), "Agricultural sample survey 2010," Report on Area and Production for Major Crops (private peasant holdings, meher season). Statistical Bulletin 237, Addis Ababa, Ethiopia2010.
 T. Hailu and K. Seyfu, "Production and importance of tef in Ethiopia agriculture. In: Hailu Tefera, Getachew Belay and Mark Sorrels (Ends)," in Narrowing the Rift: Tef Research and Development-Proceedings of the International Tef Genetics and improvement, 16-19 October2000, Addis Ababa Ethiopia, 2000.
 M. Bänziger, E. G. O., D. Beck, and M. Bellon, Breeding for drought and nitrogen stress tolerance in maize: From theory to practice. Mexico: CIMMYT, 2000.
 S. Ayalew, "Participatory demonstration and evaluation of improved variety of tef in selected districts of west and kellem wollega zones," International Journal of Education, Culture and Society, vol. 2, pp. 143-146, 2017.
 E. Tadesse., Ethiopia commodity exchange authority 'Understanding Teff': A review of supply and marketing issues. Addis Ababa, Ethiopia, 2009.
Authors like to thank Gondar Agricultural Research Center for logistic support and also Amhara Agricultural Research Institute (ARARI) for financial support for this work.
The authors declare that they have no competing interests.
Both authors contributed equally to the conception and design of the study.