biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 61:192-196, 2017 | DOI: 10.1007/s10535-016-0664-9

MtTdp1α-depleted Medicago truncatula plants show reduced cuticle permeability and altered expression of defense genes

M. Donà1, M. E. Sabatini1, M. Biggiogera1, M. Confalonieri2, A. Minio3, M. Delledonne3, G. Giraffa2, D. Carbonera1, S. Araujo4, A. Balestrazzi1,*
1 Department of Biology and Biotechnology "L. Spallanzani", Pavia, Italy
2 CRA, Centro di Ricerca per le Produzioni Foraggere e Lattiero-Casearie, Lodi, Italy
3 Department of Biotechnology, University of Verona, Verona, Italy
4 Plant Cell Biotechnology Laboratory, ITQB-UNL, Oeiras, Portugal

The link between the MtTdp1α (tyrosyl-DNA phosphodiesterase) gene, involved in the repair of DNA topoisomerase I mediated DNA damage, and the plant defense response has been investigated in MtTdp1α-depleted Medicago truncatula transgenic lines obtained by intron-spliced hairpin RNA approach, compared to the control line (CTRL, empty vector). Reduction of cuticle permeability highlighted by chlorophyll efflux assays positively correlated with the level of MtTdp1α gene silencing. The increased cuticle thickness was confirmed by transmission electron microscopy, which revealed an apparent expansion of the epicuticular waxes deposited on the outer surface. RNA-Seq analysis, carried out in the MtTdp1α-depleted plants, revealed the different expression of resistance (R) genes, PAMP (pathogen-associated-molecular pattern) triggered immunity (PTI) genes and transcription factors (TFs) involved in the regulation of the plant defense response.

Keywords: cuticular waxes; RNA-Seq; transgenic plants; tyrosyl-DNA phosphodiesterase
Subjects: gene expression; cuticular waxes; transgenic plants; tyrosyl-DNA phosphodiesterase; chlorophyll; cuticle

Received: October 19, 2015; Revised: May 2, 2016; Accepted: May 13, 2016; Published: January 1, 2017  Show citation

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Donà, M., Sabatini, M.E., Biggiogera, M., Confalonieri, M., Minio, A., Delledonne, M., ... Balestrazzi, A. (2017). MtTdp1α-depleted Medicago truncatula plants show reduced cuticle permeability and altered expression of defense genes. Biologia plantarum, 61(1), 192-196. doi: 10.1007/s10535-016-0664-9
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