Theoretical and Applied Genetics

, Volume 131, Issue 10, pp 2021–2035 | Cite as

Identification and characterization of Rht25, a locus on chromosome arm 6AS affecting wheat plant height, heading time, and spike development

  • Youngjun Mo
  • Leonardo S. Vanzetti
  • Iago Hale
  • Emiliano J. Spagnolo
  • Fabio Guidobaldi
  • Jassim Al-Oboudi
  • Natalie Odle
  • Stephen Pearce
  • Marcelo Helguera
  • Jorge DubcovskyEmail author
Original Article


Key message

This study identified Rht25, a new plant height locus on wheat chromosome arm 6AS, and characterized its pleiotropic effects on important agronomic traits.


Understanding genes regulating wheat plant height is important to optimize harvest index and maximize grain yield. In modern wheat varieties grown under high-input conditions, the gibberellin-insensitive semi-dwarfing alleles Rht-B1b and Rht-D1b have been used extensively to confer lodging tolerance and improve harvest index. However, negative pleiotropic effects of these alleles (e.g., poor seedling emergence and reduced biomass) can cause yield losses in hot and dry environments. As part of current efforts to diversify the dwarfing alleles used in wheat breeding, we identified a quantitative trait locus (QHt.ucw-6AS) affecting plant height in the proximal region of chromosome arm 6AS (< 0.4 cM from the centromere). Using a large segregating population (~ 2800 gametes) and extensive progeny tests (70–93 plants per recombinant family), we mapped QHt.ucw-6AS as a Mendelian locus to a 0.2 cM interval (144.0–148.3 Mb, IWGSC Ref Seq v1.0) and show that it is different from Rht18. QHt.ucw-6AS is officially designated as Rht25, with Rht25a representing the height-increasing allele and Rht25b the dwarfing allele. The average dwarfing effect of Rht25b was found to be approximately half of the effect observed for Rht-B1b and Rht-D1b, and the effect is greater in the presence of the height-increasing Rht-B1a and Rht-D1a alleles than in the presence of the dwarfing alleles. Rht25b is gibberellin-sensitive and shows significant pleiotropic effects on coleoptile length, heading date, spike length, spikelet number, spikelet density, and grain weight. Rht25 represents a new alternative dwarfing locus that should be evaluated for its potential to improve wheat yield in different environments.



J. Dubcovsky acknowledges financial support for this project from the Agriculture and Food Research Initiative Competitive Grant 2017-67007-25939 (WheatCAP) from the USDA National Institute of Food and Agriculture, the International Wheat Yield Partnership (IWYP) and the Howard Hughes Medical Institute. L. Vanzetti acknowledges financial support from the ANPCyT (Prestamo BID 2014, PICT1283), and INTA (PNCyO 1127042). Y. Mo is a Howard Hughes Medical Institute’s International Student Research fellow and a Monsanto’s Beachell-Borlaug International scholar.

Author contribution statement

LSV and IH developed mapping populations and conducted initial QTL mapping experiments. EJS and FG conducted field experiments and QTL analyses. YM, JA, and NO conducted high-resolution mapping experiments and GA sensitivity essays. YM and LSV wrote the first manuscript. SP and MH contributed to data analyses and manuscript revision. JD initiated and coordinated the project, contributed to data analyses, provided extensive revision and wrote the final manuscript. All authors reviewed the manuscript and provided suggestions.

Compliance with ethical standards

Confict of interest

The authors declare that there are no conflicts of interest.

Ethical approval

This study does not include human or animal subjects.

Supplementary material

122_2018_3130_MOESM1_ESM.pdf (1.1 mb)
Supplementary material 1 (PDF 1078 kb)
122_2018_3130_MOESM2_ESM.xlsx (32 kb)
Supplementary material 2 (XLSX 32 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Youngjun Mo
    • 1
    • 6
  • Leonardo S. Vanzetti
    • 2
    • 4
  • Iago Hale
    • 3
  • Emiliano J. Spagnolo
    • 2
  • Fabio Guidobaldi
    • 4
  • Jassim Al-Oboudi
    • 1
  • Natalie Odle
    • 1
  • Stephen Pearce
    • 5
  • Marcelo Helguera
    • 2
  • Jorge Dubcovsky
    • 1
    • 7
    Email author
  1. 1.Department of Plant SciencesUniversity of CaliforniaDavisUSA
  2. 2.EEA INTA Marcos JuárezInstituto Nacional de Tecnología Agropecuaria (INTA)Marcos JuárezArgentina
  3. 3.Department of Agriculture, Nutrition, and Food SystemsUniversity of New HampshireDurhamUSA
  4. 4.Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos AiresBuenos AiresArgentina
  5. 5.Department of Soil and Crop SciencesColorado State UniversityFort CollinsUSA
  6. 6.National Institute of Crop Science, Rural Development AdministrationWanjuSouth Korea
  7. 7.Howard Hughes Medical InstituteChevy ChaseUSA

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