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RXam2, a NLR from cassava (Manihot esculenta) contributes partially to the quantitative resistance to Xanthomonas phaseoli pv. manihotis
Key message The overexpression of RXam2, a cassava NLR (nucleotide-binding leucine-rich repeat) gene, by stable transformation and gene expression induction mediated by dTALEs, reduce cassava bacterial blight symptoms. Cassava ( Manihot esculenta ) is a tropical root crop affected by different patho...
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Published in: | Plant molecular biology 2022-06, Vol.109 (3), p.313-324 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Key message
The overexpression of RXam2, a cassava NLR (nucleotide-binding leucine-rich repeat) gene, by stable transformation and gene expression induction mediated by dTALEs, reduce cassava bacterial blight symptoms.
Cassava (
Manihot esculenta
) is a tropical root crop affected by different pathogens including
Xanthomonas phaseoli
pv. manihotis (
Xpm
), the causal agent of cassava bacterial blight (CBB). Previous studies have reported resistance to CBB as a quantitative and polygenic character. This study sought to validate the functional role of a NLR (nucleotide-binding leucine-rich repeat) associated with a QTL to
Xpm
strain CIO151 called
RXam2.
Transgenic cassava plants overexpressing
RXam2
were generated and analyzed. Plants overexpressing
RXam2
showed a reduction in bacterial growth to
Xpm
strains CIO151, 232 and 226. In addition, designer TALEs (dTALEs) were developed to specifically bind to the
RXam2
promoter region. The
Xpm
strain transformed with dTALEs allowed the induction of the
RXam2
gene expression after inoculation in cassava plants and was associated with a diminution in CBB symptoms. These findings suggest that
RXam2
contributes to the understanding of the molecular basis of quantitative disease resistance. |
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ISSN: | 0167-4412 1573-5028 |
DOI: | 10.1007/s11103-021-01211-2 |