Abstract
Peanut is widely grown and provides protein and edible oil for millions of people. Peanut growth and productivity are frequently negatively affected by abiotic and biotic environmental factors. However, the research on improving peanut germplasm resources by genetic transformation is very limited. Here, the novel R2R3-MYB repressor GmMYB3a was introduced into peanut plants by Agrobacterium-mediated transformation for the first time for thorough evaluation of the function of GmMYB3a in drought stress plant responses. We generated GmMYB3a-transgenic peanut plants. The GmMYB3a-overexpressing lines showed significantly improved physiological responses and no yield loss non-transgenic plants, in terms of survival rates. Thus, the GmMYB3a-overexpressing plants showed better photosynthetic performance, higher relative water content, and greater water use efficiency, demonstrating their adaptive capacity to water deficit. We conclude that overexpression of GmMYB3a can improve drought tolerance and productivity in peanut.
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Acknowledgements
This work was supported by Department of Science and Technology of Jilin Province——Creation of high-quality germplasm resources and breeding of new varieties for peanut and sunflower (grant number: 2018020170NY). The Provincial Talent Development Fund Project——Demonstration and transformation of new peanut varieties with high yield and good quality (“Jihua 5″ and “Jihua 6”) (grant number: C82400002). The Fundamental research on crop germplasm resources in the 13th five-year plan (grant number: C92073505).
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YL designed the experiments. YH and ZH conducted the experiments and drafted the manuscript. SM and BW participated in the investigation of photosynthetic physiology and agronomic characters. YH and BW conducted Agrobacterium-mediated transformation experiments and qRT-PCR analyses. All authors participated in the revision of the manuscript.
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He, Y., Mu, S., He, Z. et al. Ectopic expression of MYB repressor GmMYB3a improves drought tolerance and productivity of transgenic peanuts (Arachis hypogaea L.) under conditions of water deficit. Transgenic Res 29, 563–574 (2020). https://doi.org/10.1007/s11248-020-00220-z
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DOI: https://doi.org/10.1007/s11248-020-00220-z