Abstract
The plant hormone abscisic acid (ABA) regulates many processes of plant growth and development. ABA receptors have been identified in studies of the ABA response of stomatal movement, but the underlying mechanisms of ABA-regulated root growth and development are unclear. To address these questions, we screened for Arabidopsis thaliana mutants based on the sensitivity of root growth to exogenous ABA, using ethyl methanesulfonate-mutagenized (EMS) and T-DNA insertion mutant libraries. We identified 11 mutants, termed roa1–roa11, with Root growth Overly sensitive to ABA (ROA) phenotypes, and cloned two of the ROA genes, one by thermal asymmetric interlaced PCR technology (ROA3) and the other by map-based cloning (ROA9). The roa mutants were also found to have defects in other major ABA responses, including ABA-mediated seed germination and drought resistance. The roa mutants provide crucial genetic material for further studies of ABA signaling and regulatory mechanisms in root growth and development.
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Acknowledgements
This work was supported by the Ministry of Agriculture of China (2016ZX08009-003), the National Natural Science Foundation of China (31430061) and China Postdoctoral Science Foundation (2019M652521). We are grateful to Dr. Jan-Ru Zuo (Institute of Genetics and Developmental Biology, CAS, China) for providing T-DNA insertion mutant library seeds.
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CS, LB and HD conceived and directed the project. HD and HW, XL, JL, and PZ carried out all the experiments. HD, LB, and XM performed the integrated data analysis and wrote the manuscript.
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Dong, H., Ma, X., Zhang, P. et al. Characterization of Arabidopsis thaliana Root-Related Mutants Reveals ABA Regulation of Plant Development and Drought Resistance. J Plant Growth Regul 39, 1393–1401 (2020). https://doi.org/10.1007/s00344-020-10076-6
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DOI: https://doi.org/10.1007/s00344-020-10076-6