Boni: Improved Tef Variety for Drought-Prone Areas of Ethiopia

Abstract

Tef [Eragrostis tef (Zucc.) Trotter] is extensively cultivated cereal crop in Ethiopia where it is annually grown by about 6.5 million smallholder farmers on about 30% of the total area allocated to cereal crops. However, the productivity of tef is very low compared to other cereals mainly due to little scientific research on the crop, widespread use of local varieties coupled with traditional cultural practices, and lack of drought tolerant varieties. A multi-environment field experiment was, therefore, carried with the objectives of identifying and releasing high yielding and farmer- and consumer-preferred tef variety for moisture deficit areas of the country. The drought tolerant tef genotypes tested were derived from two independent crosses of Dtt2 x Dtt13 and DZ-Cr-387 x Dtt2. The parental lines Dtt2 (drought tolerant tef2) and Dtt13 (drought tolerant tef 13) were obtained by screening 5,000 ethylmethane sulfonate (EMS) mutagenized populations from an improved variety called Tsedey. Twelve candidate droughts tolerant tef genotypes from preliminary variety trials and a local as well as standard check varieties (Boset) were tested over two years (2018 and 2019 main cropping seasons) at five moisture deficit tef growing areas in Ethiopia (viz. Debre Zeit light soil, Minjar, Alemtena, Melkassa and Sirinka) using randomized complete block design with four replications. Late sowing combined with light textured soils was used to simulate terminal drought stress at Debre Zeit light soil and Minjar. The combined analyses of variance did not exhibit statistically significant difference for genotype by environment interaction. However, among the tested lines, the candidate line RIL 37 from Dtt2 x Dtt13 cross was found superior in grain yield over the standard check Boset variety (by 13.2%) and the local cultivar (by 27.6%). The candidate line was further evaluated in the variety verification trial during the 2020 main cropping season and approved for the release by the National Variety Release Committee in 2021 with name DZ-Cr-498 (RIL 37) or Boni.