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Ectopic Expression of Riboflavin-binding Protein Gene TsRfBP Paradoxically Enhances Both Plant Growth and Drought Tolerance in Transgenic Arabidopsis thaliana

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Abstract

Riboflavin is the precursor of the coenzymes flavin monophosphate (FMN) and flavin adenine dinucleotide (FAD), which serve as indispensable redox cofactors in all plants. Numerous data indicate that riboflavin is involved in pathogen resistance but less data are available on abiotic stress tolerance. In this experiment, the overexpression of the riboflavin-binding protein resulted in an enhancement of vegetative growth and net photosynthetic rate, and an acceleration of floral transition in transgenic Arabidopsis thaliana REAT11 (containing less than half the normal levels of free riboflavin, FMN, and FAD) compared to wild-type Col-0 under nonstressed conditions. The effect of drought stress on the antioxidant response of Col-0 and REAT11 was compared, where 20- and 40-day-old grown plants were subjected to 10 % PEG 6000 treatment for 2 days. Stress conditions caused a significant increase in H2O2 accumulation, lipid peroxidation, and membrane permeability in Col-0 over that in REAT11. Greater activity levels of superoxide dismutase, ascorbate peroxidase, and glutathione reductase were observed in the leaves of REAT11 compared to those of Col-0. Significant increases in total ascorbate and glutathione content and higher ratios of ASC/DHA: (ASC and DHA are reduced and oxidized ascorbate, respectively) and GSH/GSSG: (GSH and GSSG are reduced and oxidized glutathione, respectively) were observed in the leaves of REAT11 compared to those in Col-0 under drought conditions. In addition, enhancement of free proline and soluble sugar accumulation was observed in REAT11 compared to Col-0 under stress. Our results suggest that a slight deficiency in free riboflavin can paradoxically induce both a higher vegetative growth rate and an enhanced tolerance to drought in transgenic plants. The “stress escape” hypothesis is proposed here to explain this interesting phenomenon.

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Acknowledgments

This study was supported by grants from the Natural Science Foundation of China (31171830) and Jiangsu Provincial Priority Academic Program Development of Higher Education Institutions.

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  1. Laboratory of Plant Growth and Signaling Defense, Department of Plant Pathology, Nanjing Agriculture University, Nanjing, 210095, China

    Benliang Deng & Hansong Dong

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  1. Benliang Deng
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  2. Hansong Dong
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Correspondence to Hansong Dong.

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Deng, B., Dong, H. Ectopic Expression of Riboflavin-binding Protein Gene TsRfBP Paradoxically Enhances Both Plant Growth and Drought Tolerance in Transgenic Arabidopsis thaliana . J Plant Growth Regul 32, 170–181 (2013). https://doi.org/10.1007/s00344-012-9285-5

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