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Natural genetic variation underlying tiller development in barley (Hordeum vulgare L)

View ORCID ProfileAllison M. Haaning, View ORCID ProfileKevin P. Smith, Gina L. Brown-Guedira, Shiaoman Chao, Priyanka Tyagi, Gary J. Muehlbauer
doi: https://doi.org/10.1101/730945
Allison M. Haaning
Department of Plant and Microbial Biology, University of Minnesota, Saint Paul, Minnesota, United States of AmericaDepartment of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, Minnesota, United States of America
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  • ORCID record for Allison M. Haaning
Kevin P. Smith
Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, Minnesota, United States of America
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  • ORCID record for Kevin P. Smith
Gina L. Brown-Guedira
Plant Science Research, United States Department of Agriculture-Agricultural Research Service, Raleigh, North Carolina, United States of America
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Shiaoman Chao
Department of Cereal Crops Research, Red River Valley Agricultural Research Center, United States Department of Agriculture-Agricultural Research Service, Raleigh, North Carolina, United States of America
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Priyanka Tyagi
Plant Science Research, United States Department of Agriculture-Agricultural Research Service, Raleigh, North Carolina, United States of America
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Gary J. Muehlbauer
Department of Plant and Microbial Biology, University of Minnesota, Saint Paul, Minnesota, United States of AmericaDepartment of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, Minnesota, United States of America
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  • For correspondence: Muehl003@umn.edu
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ABSTRACT

In barley (Hordeum vulgare L.), lateral branches called tillers contribute to grain yield and define shoot architecture, but genetic control of tiller number and developmental rate are not well characterized. The primary objectives of this work were to examine relationships between tiller number and other agronomic and morphological traits and identify natural genetic variation associated with tiller number and rate, and related traits. We grew 768 lines from the USDA National Small Grain Core Collection in the field and collected data over two years for tiller number and rate, and agronomic and morphological traits. Our results confirmed that spike row-type and days to heading are correlated with tiller number, and as much as 28% of tiller number variance is attributed to these traits. In addition, negative correlations between tiller number and leaf width and stem diameter were observed, indicating trade-offs between tiller development and other vegetative growth. Thirty-three quantitative trait loci (QTL) were associated with tiller number or rate. Of these, 40% overlapped QTL associated with days to heading and 22% overlapped QTL associated with spike row-type, further supporting that tiller development is influenced by these traits. Despite this, some QTL associated with tiller number or rate, including the major QTL on chromosome 3H, were not associated with any other traits, suggesting that tiller number can be modified independently of other important agronomic traits. These results enhance our knowledge of the genetic control of tiller development in barley, which is important for optimizing tiller number and rate for yield improvement.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted August 09, 2019.
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Natural genetic variation underlying tiller development in barley (Hordeum vulgare L)
Allison M. Haaning, Kevin P. Smith, Gina L. Brown-Guedira, Shiaoman Chao, Priyanka Tyagi, Gary J. Muehlbauer
bioRxiv 730945; doi: https://doi.org/10.1101/730945
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Natural genetic variation underlying tiller development in barley (Hordeum vulgare L)
Allison M. Haaning, Kevin P. Smith, Gina L. Brown-Guedira, Shiaoman Chao, Priyanka Tyagi, Gary J. Muehlbauer
bioRxiv 730945; doi: https://doi.org/10.1101/730945

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