The plant-specific NAC transcription factor VASCULAR-RELATED NAC-DOMAIN 7 (VND7) functions in xylem vessel cell differentiation in . To identify novel factors regulating xylem vessel cell differentiation, we previously performed ethyl methanesulfonate mutagenesis of a transgenic line in which VND7 activity can be induced post-translationally by glucocorticoid treatment. We successfully isolated mutants that fail to form ectopic xylem vessel cells named () mutants. Here, we isolated eight novel dominant mutants: to . In these mutants, ectopic xylem vessel cell differentiation was inhibited in aboveground but not underground tissues. Specifically, the shoot apices of the mutants, containing shoot apical meristems and leaf primordia, completely lacked ectopic xylem vessel cells. In these mutants, the VND7-induced upregulation of downstream genes was reduced, especially in shoots compared to roots. However, endogenous xylem vessel cell formation was not affected in the mutants. Therefore, the mutations identified in this study have repressive effects on cell differentiation in shoot meristematic regions, resulting in inhibited ectopic xylem vessel cell differentiation.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7557666 | PMC |
http://dx.doi.org/10.5511/plantbiotechnology.20.0427a | DOI Listing |
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