Abstract
NAM, ATAF, and CUC (NAC) domain-containing proteins are plant-specific transcription factors involved in stress responses and developmental regulation. MusaVND2 and MusaVND3 are vascular-related NAC domain-containing genes encoding for nuclear-localized proteins. The transcript level of MusaVND2 and MusaVND3 are gradually induced after induction of lignification conditions in banana embryogenic cells. Banana embryogenic cells differentiated to tracheary element-like cells after overexpression of MusaVND2 and MusaVND3 with a differentiation frequency of 63.5 and 23.4 %, respectively, after ninth day. Transgenic banana plants overexpressing either of MusaVND2 or MusaVND3 showed ectopic secondary wall deposition as well as transdifferentiation of cells into tracheary elements. Transdifferentiation to tracheary element-like cells was observed in cortical cells of corm and in epidermal and mesophyll cells of leaves of transgenic plants. Elevated levels of lignin and crystalline cellulose were detected in the transgenic banana lines than control plants. The results obtained are useful for understanding the molecular regulation of secondary wall development in banana.
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Authors thank Dr. SP Kale, Head, Nuclear Agriculture and Biotechnology Division, BARC for his constant encouragement.
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Negi, S., Tak, H. & Ganapathi, T.R. Functional characterization of secondary wall deposition regulating transcription factors MusaVND2 and MusaVND3 in transgenic banana plants. Protoplasma 253, 431–446 (2016). https://doi.org/10.1007/s00709-015-0822-5
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DOI: https://doi.org/10.1007/s00709-015-0822-5