As one of the important secondary metabolites, proanthocyanidins (PAs) are not only a defense mechanism for plants to cope with biotic and abiotic stresses, but also a key factor affecting the development and quality of plants. Although the biosynthetic and metabolic pathways of proanthocyanidins have been basically clarified in the model plants, the regulatory mechanism in cotton has not been fully elucidated. In this work, a transcription factor gene GhTT2 (transparent testa 2) was cloned from Gossypium hirsutum.
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