Title: CRISPR/Cas9-mediated Targeted Mutagenesis for Functional Genomics Research of Crassulacean Acid Metabolism Plants

Journal Article · · Journal of Experimental Botany
DOI: https://doi.org/10.1093/jxb/erz415 · OSTI ID:1569393
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biosciences Division; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). DOE-Center for Bioenergy Innovation (CBI)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biosciences Division; Southwest Univ. of Science and Technology, Mianyang, Sichuan (China). School of Life Science and Engineering
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept.t of Chemical and Biomolecular Engineering
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biosciences Division
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). DOE-Center for Bioenergy Innovation (CBI); Univ. of Tennessee, Knoxville, TN (United States). Dept.t of Chemical and Biomolecular Engineering

Crassulacean acid metabolism (CAM) is an important photosynthetic pathway in diverse lineages of plants featuring high water-use efficiency and drought tolerance. A big challenge facing the CAM research community is to understand the function of the annotated genes in CAM plant genomes. Recently, a new genome editing technology using CRISPR/Cas9 has become a more precise and powerful tool than traditional approaches for functional genomics research in C3 and C4 plants. In this study, we seek to realize the potential of CRISPR/Cas9 to characterize the function of CAM-related genes in the model CAM species Kalanchoë fedtschenkoi. We demonstrate that CRISPR/Cas9 is effective to create biallelic indel mutagenesis to reveal previously unknown roles of blue light receptor phototropin 2 (KfePHOT2) in the CAM pathway. Knocking-out of the KfePHOT2 reduced stomatal conductance and CO2 fixation in the late afternoon and increased stomatal conductance and CO2 fixation in the early evening, indicating that blue light signaling plays an important role in the CAM pathway. Lastly, we provide a genome-wide gRNA database targeting 45,183 protein-coding genes annotated in the K. fedtschenkoi genome.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1569393
Journal Information:
Journal of Experimental Botany, Journal Name: Journal of Experimental Botany Journal Issue: 22 Vol. 70; ISSN 0022-0957
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

New perspectives on crassulacean acid metabolism biology journal November 2019
Comparative genomics can provide new insights into the evolutionary mechanisms and gene function in CAM plants journal September 2019