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Alemayehu Balcha, Gretzmacher, R., Vollmann, J..
(2006): Genetic variation in nitrogen-use efficiency of tef,
J PLANT NUTR SOIL SC, 169, 704-710; ISSN 1436-8730 FullText FullText_BOKU

Abstract:
Tef (Eragrostis tef (Zucc.) Trotter) is the ancient and most important cereal food crop of Ethiopia. A set of 20 tef genotypes was investigated in field experiments at three environments in Ethiopia to estimate genetic variation in nitrogen (N)-use efficiency and in characters related to N accumulation as well as their relationships to grain yield. In each environment, genotypes representing both widely grown landraces and recently released cultivars were grown under three N-fertilizer rates (0, 4, and 8 g m(-2) N). In grain yield, modern cultivars were superior to landraces, whereas in other characters, differences were less clear. The variation in grain yield was significantly related to the variation in total grain N and total plant N. Grain yield weakly correlated with N-utilization efficiency and N harvest index. Broad sense heritability was higher for grain yield, total grain N, total plant N, and N harvest index than for N-use, N-uptake, and N-utilization efficiencies. The contribution of uptake efficiency to the variation in N-use efficiency decreased from 75% to 55% and that of utilization efficiency increased from 22% to 43% at the 4 to 8 g m(-2) N-supply rate change. This study clearly suggests that tef N-use efficiency would be increased by selecting genotypes with greater uptake efficiency at low N-supply levels.
Authors BOKU Wien:
Gretzmacher Ralph
Vollmann Johann
BOKU Gendermonitor:


Find related publications in this database (Keywords)
Eragrostis tef
nitrogen-use efficiency
utilization efficiency
uptake efficiency
heritability estimation


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