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Overexpression of RsMYB1 enhances anthocyanin accumulation and heavy metal stress tolerance in transgenic petunia

The RsMYB1 transcription factor (TF) controls the regulation of anthocyanin in radishes (Raphanus sativus), and its overexpression in tobacco and petunias strongly enhances anthocyanin production. However, there are no data on the involvement of RsMYB1 in the mechanisms underlying abiotic stress tolerance, despite strong sequence similarity with other MYBs that confer such tolerance. In this study, we used the anthocyanin-enriched transgenic petunia lines PM6 and PM2, which overexpress RsMYB1. | Overexpression of RsMYB1 enhances anthocyanin accumulation and heavy metal stress tolerance in transgenic petunia ORIGINAL RESEARCH published: 20 September 2018 doi: 10.3389/fpls.2018.01388 Overexpression of RsMYB1 Enhances Anthocyanin Accumulation and Heavy Metal Stress Tolerance in Transgenic Petunia Trinh Ngoc Ai 1,2† , Aung Htay Naing 1† , Byung-Wook Yun 3* , Sun Hyung Lim 4 and Chang Kil Kim 1* 1 Department of Horticultural Science, Kyungpook National University, Daegu, South Korea, 2 School of Agriculture and Aquaculture, Tra Vinh University, Trà Vinh, Vietnam, 3 School of Applied Biosciences, Kyungpook National University, Daegu, South Korea, 4 National Institute of Agricultural Science, RDA, Jeonju, South Korea The RsMYB1 transcription factor (TF) controls the regulation of anthocyanin in radishes Edited by: Wim Van den Ende, (Raphanus sativus), and its overexpression in tobacco and petunias strongly enhances KU Leuven, Belgium anthocyanin production. However, there are no data on the involvement of RsMYB1 in Reviewed by: the mechanisms underlying abiotic stress tolerance, despite strong sequence similarity Iwona Małgorzata Morkunas, with other MYBs that confer such tolerance. In this study, we used the anthocyanin- Poznan´ University of Life Sciences, Poland enriched transgenic petunia lines PM6 and PM2, which overexpress RsMYB1. The Ravi Valluru, tolerance of these lines to heavy metal stress was investigated by examining several Cornell University, United States physiological and biochemical factors, and the transcript levels of genes related to metal *Correspondence: Byung-Wook Yun detoxification and antioxidant activity were quantified. Under normal conditions (control bwyun@knu.ac.kr conditions), transgenic petunia plants (T2 -PM6 and T2 -PM2) expressing RsMYB1, as Chang Kil Kim well as wild-type (WT) plants, were able to thrive by producing well-developed broad .