African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6272

Full Length Research Paper

Selection efficiency of yield based drought tolerance indices to identify superior sorghum [Sorghum bicolor (L.) Moench] near isogenic lines (NILs) under two-contrasting environments

Teklay Abebe
  • Teklay Abebe
  • Ethiopian Institute of Agricultural Research, P. O. Box 2003, Addis Ababa, Ethiopia.
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Gurja Belay
  • Gurja Belay
  • Department of Microbial, Cellular and Molecular Biology, Faculty of Life Science, Addis Ababa University, P. O. Box 1176, Addis Ababa, Ethiopia.
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Taye Tadesse
  • Taye Tadesse
  • Ethiopian Institute of Agricultural Research, P. O. Box 2003, Addis Ababa, Ethiopia.
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Gemechu Keneni
  • Gemechu Keneni
  • Ethiopian Institute of Agricultural Research, P. O. Box 2003, Addis Ababa, Ethiopia.
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  •  Received: 04 January 2020
  •  Accepted: 10 February 2020
  •  Published: 31 March 2020

Abstract

Drought is the most significant environmental calamity on sorghum in Ethiopia and hence improving yield under drought is a major goal of plant breeding. This study was designed to introgress drought tolerant genes into adapted varieties through marker-assisted backcrossing and select based on tolerance indices. Sixty-one near isogenic lines and along with their nine parental lines were evaluated under full-irrigation and water-limited condition in Alpha lattice design with three replications. Yield-based drought tolerance indices including stress tolerance index (STI), mean relative performance (MRP), geometric mean productivity (GMP), harmonic mean (HM), mean productivity(MP), tolerance index (TOL), stress susceptible index(SSI), yield stability index (YSI) and yield index (YI)were calculated based on yield obtained from the two moisture regimes. Results showed that genotypes differed significantly in yield and their indices. Mean grain yields that varied widely in stressed (1.1  to 4.42 t ha-1) and full-irrigation (2.25 to 5.71 t ha-1) were 1.93 and 3.7 t ha-1, respectively. Of the near isogenic lines, four (BC2F3_ETSC_16258,BC2F3_ETSC_16216, BC2F3_ETSC_16257, and BC2F3_ETSC_16213) were top yielding in stressed conditions with values of 4.42, 3.5, 3.1, and 2.83 t ha-1, respectively. These progenies also showed consistently higher values of STI, MRP, GMP, HM, MP, YSI, and YI and lower values of SSI and TOL indicating less sensitive to stress. The correlation and principal component analyses also revealed STI, MRP, GMP, HM, MP and YI showed highly significant positive correlation among themselves and yield in both environments, indicating their suitability for identifying superior genotypes. Overall, STI, MRP, GMP, HM and MP indices can be efficiently exploited to screen drought tolerance or superior genotype(s) under both moisture conditions.

Key words: Coefficient of correlation, drought tolerance indices, principal component, clusters analysis.