Overexpression of full-length and partial DREB2A enhances soybean drought tolerance
Resumo
Soybean is an important commodity worldwide. Abiotic conditions can adversely disturb crop growth and final yield. The transcription factor Dehydration-Responsive Element-Binding Proteins 2 (DREB2) act as a regulator of drought-responses. This study aimed to characterize soybean plants genetically modified with GmDREB2A;2 FL and GmDREB2A;2 CA for molecular, physiological, and agronomic responses, at different developmental periods. Results showed that seedlings from GmDREB2A;2 FL event presented lower growth reduction under osmotic treatment during germination. The GmDREB2A;2 FL and GmDREB2A;2 CA events showed improved performance in experiments of water deficit imposed in the vegetative period and higher rates in physiological parameters. In the reproductive period, there was a trend of higher yield compounds in GM GmDREB2A;2 FL event when compared to other genotypes and treatments. It was suggested that GmDREB2A;2 FL event presented superior performance due to the higher expression levels of the cisgene and drought-induced genes.
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