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A novel DCL2-dependent miRNA pathway in tomato affects susceptibility to RNA viruses.


ABSTRACT: Tomato Dicer-like2 (slDCL2) is a key component of resistance pathways against potato virus X (PVX) and tobacco mosaic virus (TMV). It is also required for production of endogenous small RNAs, including miR6026 and other noncanonical microRNAs (miRNAs). The slDCL2 mRNAs are targets of these slDCL2-dependent RNAs in a feedback loop that was disrupted by target mimic RNAs of miR6026. In lines expressing these RNAs, there was correspondingly enhanced resistance against PVX and TMV. These findings illustrate a novel miRNA pathway in plants and a crop protection strategy in which miRNA target mimicry elevates expression of defense-related mRNAs.

SUBMITTER: Wang Z 

PROVIDER: S-EPMC6120711 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature

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A novel DCL2-dependent miRNA pathway in tomato affects susceptibility to RNA viruses.

Wang Zhengming Z   Hardcastle Thomas J TJ   Canto Pastor Alex A   Yip Wing Hin WH   Tang Shuoya S   Baulcombe David C DC  

Genes & development 20180827 17-18


Tomato Dicer-like2 (slDCL2) is a key component of resistance pathways against potato virus X (PVX) and tobacco mosaic virus (TMV). It is also required for production of endogenous small RNAs, including miR6026 and other noncanonical microRNAs (miRNAs). The <i>slDCL</i>2 mRNAs are targets of these slDCL2-dependent RNAs in a feedback loop that was disrupted by target mimic RNAs of miR6026. In lines expressing these RNAs, there was correspondingly enhanced resistance against PVX and TMV. These find  ...[more]

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