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A histidine kinase gene is required for large radius root tip circumnutation and surface exploration in rice

Kevin R. Lehner, Isaiah Taylor, Erin N. McCaskey, Rashmi Jain, Pamela C. Ronald, Daniel I. Goldman, Philip N. Benfey
doi: https://doi.org/10.1101/437012
Kevin R. Lehner
1Department of Biology, Duke University, Durham, NC 27708
2University Program in Genetics and Genomics, Duke University, Durham, NC 27708
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Isaiah Taylor
1Department of Biology, Duke University, Durham, NC 27708
5Howard Hughes Medical Institute, Duke University, Durham, NC 27708
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Erin N. McCaskey
3School of Physics, Georgia Institute of Technology, Atlanta, GA 30332
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Rashmi Jain
4Department of Plant Pathology and the Genome Center, University of California, Davis, CA 95616
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Pamela C. Ronald
4Department of Plant Pathology and the Genome Center, University of California, Davis, CA 95616
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Daniel I. Goldman
3School of Physics, Georgia Institute of Technology, Atlanta, GA 30332
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Philip N. Benfey
1Department of Biology, Duke University, Durham, NC 27708
5Howard Hughes Medical Institute, Duke University, Durham, NC 27708
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Abstract

The intricate growth patterns that accompany plant organ elongation have long intrigued biologists 1. Circumnutation refers to the circular or elliptical growth of the tip of a plant organ around a central axis. While the utility of circumnutation for climbing plants is clear, its function in roots is less obvious. Additionally, the genetic requirements for root circumnutation are not known. Here we show that mutations in a gene encoding a histidine kinase abolish large radius root tip circumnutation in rice. Using a gel-based imaging system and a whole genome sequenced mutant population, we identified three different mutant alleles of the gene OsHK1 that exhibit increased seedling root depth. Time-lapse imaging indicated that this phenotype is likely due to a lack of large radius root tip circumnutation in OsHK1 mutants. Treatment of mutant roots with the plant hormone zeatin rescues circumnutation, indicating that OsHK1 functions in a cytokinin-related signaling pathway. We found that OsHK1 mutants are impaired in their ability to explore flat surfaces, suggesting that circumnutation facilitates root exploration at the interface of compacted soil horizons.

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Posted October 07, 2018.
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A histidine kinase gene is required for large radius root tip circumnutation and surface exploration in rice
Kevin R. Lehner, Isaiah Taylor, Erin N. McCaskey, Rashmi Jain, Pamela C. Ronald, Daniel I. Goldman, Philip N. Benfey
bioRxiv 437012; doi: https://doi.org/10.1101/437012
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A histidine kinase gene is required for large radius root tip circumnutation and surface exploration in rice
Kevin R. Lehner, Isaiah Taylor, Erin N. McCaskey, Rashmi Jain, Pamela C. Ronald, Daniel I. Goldman, Philip N. Benfey
bioRxiv 437012; doi: https://doi.org/10.1101/437012

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