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Genomic regions associated with grain yield under drought stress in wheat (Triticum aestivum L.)

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Abstract

Water deficit stress (WDS) is a serious constraint to wheat productivity in rain-fed and limited irrigation environments. Identifying genomic regions responsible for grain yield (GY) under WDS will aid in understanding the genetics of drought tolerance (DT) and development of DT cultivars. A population of 206 recombinant inbred lines derived from WL711/C306 was phenotyped for GY and related traits under water deficit and irrigated conditions in seven different environments to identify genomic regions associated with eleven yield related traits. Both the parents contributed positive alleles for the traits studied. A novel genomic region for GY under WDS, qGYWD.3B.1 was detected on chromosome 3BS of wheat. The yield enhancing allele under drought stress at this locus was contributed by DT parent C306. This genomic region explained 18.7 % of phenotypic variation for GY under WDS and co-located with genomic regions for GY components. Another novel, consistent genomic region for GY under WDS, qGYWD.3B.2 explained 19.6 % of phenotypic variation with positive allele coming from drought susceptible parent WL711. A novel genomic region for drought susceptibility index for GY, qDSIGY.4A.1 was consistently detected in six of seven environments explaining 15.6 % of phenotypic variation. Other important genomic regions for GY and biomass under WDS were mapped on chromosomes 7BL and 6AS, respectively. Fine mapping of the major QTLs on chromosome 3BS will enable identification of robust markers and candidate genes for marker-assisted breeding for DT in wheat.

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Acknowledgments

We are thankful to Dr. Jag Shoran and Dr. Sai Prasad for their help in conducting experiments at Karnal and Indore respectively. We are thankful to the Indian Council of Agricultural Research for financial support under the NPTC project.

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Author notes

  1. Rajendra V. Patil

    Present address: Meta-Helix Life Sciences Ltd., Vegetable R&D Centre, Nashik, 422007, Maharashtra, India

Authors and Affiliations

  1. Stress Physiology Laboratory, Water Technology Centre, Indian Agricultural Research Institute, New Delhi, 110012, India

    Sanyukta Shukla, Kalpana Singh, Rajendra V. Patil & Renu Khanna-Chopra

  2. National Research Centre on Plant Biotechnology, New Delhi, 110012, India

    Suhas Kadam & Nagendra Kumar Singh

  3. School of Life Sciences, DAVV, Indore, 452001, Madhya Pradesh, India

    Sudhakar Bharti

  4. High Altitude Plant Physiology Research Centre, HNB Garhwal University, Srinagar, 246174, Uttarakhand, India

    Pratti Prasad

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Correspondence to Renu Khanna-Chopra.

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Sanyukta Shukla and Kalpana Singh have contributed equally to this work.

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Shukla, S., Singh, K., Patil, R.V. et al. Genomic regions associated with grain yield under drought stress in wheat (Triticum aestivum L.). Euphytica 203, 449–467 (2015). https://doi.org/10.1007/s10681-014-1314-y

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