Overexpression of PsoRPM3, an NBS-LRR gene isolated from myrobalan plum, confers resistance to Meloidogyne incognita in tobacco
Key messages We reported an NBS-LRR gene, PsoRPM3 , is highly expressed following RKN infection, initiating an HR response that promotes plant resistance. Meloidogyne spp. are root-knot nematodes (RKNs) that cause substantial economic losses worldwide. Screening for resistant tree resources and iden...
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Published in | Plant molecular biology Vol. 107; no. 3; pp. 129 - 146 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Dordrecht
Springer Netherlands
01.10.2021
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Key messages
We reported an NBS-LRR gene,
PsoRPM3
, is highly expressed following RKN infection, initiating an HR response that promotes plant resistance.
Meloidogyne
spp. are root-knot nematodes (RKNs) that cause substantial economic losses worldwide. Screening for resistant tree resources and identifying plant resistance genes is currently the most effective way to prevent RKN infestations. Here, we cloned a novel TIR-NB-LRR-type resistance gene,
PsoRPM3
, from Xinjiang wild myrobalan plum (
Prunus sogdiana
Vassilcz.) and demonstrated that its protein product localized to the nucleus. In response to
Meloidogyne incognita
infection,
PsoRPM3
gene expression levels were significantly higher in resistant myrobalan plum plants compared to susceptible plants. We investigated this difference, discovering that the − 309 to − 19 bp region of the susceptible
PsoRPM3
promoter was highly methylated. Indeed, heterologous expression of
PsoRPM3
significantly enhanced the resistance of susceptible tobacco plants to
M. incognita
. Moreover, transient expression of
PsoRPM3
induced a hypersensitive response in tobacco, whereas RNAi-mediated silencing of
PsoRPM3
in transgenic tobacco reduced this hypersensitive response. Several hypersensitive response marker genes were considerably up-regulated in resistant myrobalan plum plants when compared with susceptible counterparts inoculated with
M. incognita
.
PsoPR1a
(a SA marker gene),
PsoPR2
(a JA marker gene), and
PsoACS6
(an ET signaling marker gene) were all more highly expressed in resistant than in susceptible plants. Together, these results support a model in which
PsoRPM3
is highly expressed following RKN infection, initiating an HR response that promotes plant resistance through activated salicylic acid, jasmonic acid, and ethylene signaling pathways. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0167-4412 1573-5028 |
DOI: | 10.1007/s11103-021-01185-1 |