Study of Growth and Physiological Characters in Stay-green QTL Introgression Sorghum bicolor (L.) Lines under Post-flowering Drought Stress

Abstract

This experiment was carried out to evaluate the growth, physiological and yield traits of stay-green (Stg) QTL introgression sorghum lines, which were developed by the Ethiopian Institute of Agricultural Research in collaboration with ICRISAT between 2006 and 2008, under induced post-flowering drought stress. It involved a total of 12 genotypes including seven Stg QTL introgression lines, two Stg donor parents and three senescent recurrent parents. It was organized in a split plot design with three replications under well-watered and induced drought stress growing conditions at Melka Werer, Ethiopia during the post-rainy season of 2014. Analysis of variance revealed that the effect of moisture regimes on all measured traits was significant (P < 0.05). Differences among the genotypes and genotypeby-water regime interaction were also significant (P < 0.05) for all the traits considered. Post-flowering drought stress was observed to significantly reduce most of the growth, physiological and yield related traits. The Stg introgression lines Meko/B35-selection 120, Teshale/ B35-selection 2 and Teshale/E36-1 showed better drought stress tolerance properties than the rest of the genotypes based on the measured growth and physiological traits. These introgression lines also showed better grain yield than their recurrent parents under post-flowering drought stress and can be used as new versions of the existing varieties (served as recurrent parents) and for future breeding programs. Furthermore, leaf chlorophyll content, assimilation rate, transpiration rate, water use efficiency, root length and root dry weight were found to have strong correlation and can be used to screen genotypes for post-flowering drought tolerance.

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Acknowledgements

We thank the national sorghum research program of the Ethiopian Institute of Agricultural Research (EIAR) at Melkassa Agricultural Research Center, Adama for providing with the experimental materials. The Department of Plant Biology and Biodiversity Management of Addis Ababa University is also hereby acknowledged for the laboratory space and equipment.

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Correspondence to A. Adugna.

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Communicated by A. Börner

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Sintayehu, S., Adugna, A., Fetene, M. et al. Study of Growth and Physiological Characters in Stay-green QTL Introgression Sorghum bicolor (L.) Lines under Post-flowering Drought Stress. CEREAL RESEARCH COMMUNICATIONS 46, 54–66 (2018). https://doi.org/10.1556/0806.45.2017.061

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Keywords

  • drought
  • growth
  • QTL introgression lines
  • sorghum
  • stay-green