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Identification and validation of root length QTLs for water stress resistance in hexaploid wheat (Titicum aestivum L.)

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Abstract

Thorough understanding of the genetic mechanisms governing drought adaptive traits can facilitate drought resistance improvement. This study was conducted to identify chromosome regions harbouring QTLs contributing for water stress resistance in wheat. A RIL mapping population derived from a cross between W7984 (Synthetic) and Opata 85 was phenotyped for root length and root dry weight under water stress and non-stress growing conditions. ANOVA showed highly significant (p ≤ 0.01) variation among the RILs for both traits. Root length and root dry weight showed positive and significant (p ≤ 0.01) phenotypic correlation. Broad sense heritability was 86% for root length under stress and 65% for root dry weight under non-stress conditions. A total of eight root length and five root dry weight QTLs were identified under both water conditions. Root length QTLs Qrln.uwa.1BL, Qrln.uwa.2DS, Qrln.uwa.5AL and Qrln.uwa.6AL combined explained 43% of phenotypic variation under non-stress condition. Opata was the source of favourable alleles for root length QTLs under non-stress condition except for Qrln.uwa.6AL. Four stress specific root length QTLs, Qrls.uwa.1AS, Qrls.uwa.3AL, Qrls.uwa.7BL.1 and Qrls.uwa.7BL.2 jointly explained 47% of phenotypic variation. Synthetic wheat contributed favourable alleles for Qrls.uwa.1AS and Qrls.uwa.3AL. Two stable root dry weight QTLs on chromosomes 4AL and 5AL were consistently found in both water conditions. Three validation populations were developed by crossing cultivars Lang, Yitpi, and Chara with Synthetic W7984 to transfer two of the QTLs identified under stress condition. The F2.3 and F3.4 validation lines were phenotyped under the same level of water stress as RILs to examine the effect of these QTLs. There were 13.5 and 14.5% increases in average root length due to the inheritance of Qrls.uwa.1AS and Qrls.uwa.3AL, respectively. The result indicated that closely linked SSR markers Xbarc148 (Qrls.uwa.1AS) and Xgwm391 (Qrls.uwa.3AL) can be incorporated into MAS for water stress improvement in wheat.

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Acknowledgements

Australian development scholarship funded the study of the first author. We thank Dr Chunji Liu of CSIRO for providing some of the wheat genotypes.

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Authors and Affiliations

  1. Breeding Material Development Unit, Institute of Crop Science, National Agriculture and Food Research Organization (NARO), 2-1-2 Kannondai, Tsukuba, 305-8518, Japan

    Habtamu Ayalew

  2. Department of Horticulture, College of Agriculture and Natural Resources, Debre Markos University, P.O. Box 269, Debre Markos, Ethiopia

    Habtamu Ayalew

  3. School of Plant Biology, Faculty of Science and The UWA Institute of Agriculture, The University of Western Australia, 35 Stirling High Way, Crawley, WA, 6009, Australia

    Habtamu Ayalew, Hui Liu & Guijun Yan

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  1. Habtamu Ayalew
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Correspondence to Habtamu Ayalew or Guijun Yan.

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Ayalew, H., Liu, H. & Yan, G. Identification and validation of root length QTLs for water stress resistance in hexaploid wheat (Titicum aestivum L.). Euphytica 213, 126 (2017). https://doi.org/10.1007/s10681-017-1914-4

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