Root-specific role for nicotiana benthamiana RDR6 in the inhibition of chinese wheat mosaic virus accumulation at higher temperatures

Ida Bagus Andika, Liying Sun, Rong Xiang, Junmin Li, Jianping Chen

    Research output: Contribution to journalArticlepeer-review

    21 Citations (Scopus)

    Abstract

    Some viruses only infect plants at cool temperatures but the molecular mechanism underlying this low-temperature dependence remains unclear. Chinese wheat mosaic virus (CWMV, genus Furovirus) was able to infect wheat and Nicotiana benthamiana plants at 16 but not at 24°C. When CWMV-infected plants were transferred to 24°C for 2 weeks, the newly emerged leaves and roots became virus free. Co-infection with Potato virus Y rescued CWMV accumulation in N. benthamiana plants after a temperature shift to 24°C. In transgenic N. benthamiana plants silenced for the N. benthamiana RNA-dependent RNA polymerase 6 (NbRDR6), CWMV was able to accumulate in roots but not in leaves after a temperature shift to 24°C. Deep sequencing of small RNAs showed that, at 16°C, abundant CWMV small interfering (si)RNAs accumulated in infected N. benthamiana plants. Silencing of NbRDR6 increased the abundance of CWMV siRNAs and the generation of siRNAs from hotspots in the CWMV genome. In contrast, when shifted to 24°C for 1 week, CWMV siRNAs were markedly fewer in roots of NbRDR6-silenced than in roots of wildtype plants but were similar in the leaves of those plants. Our results demonstrate the root-specific role of NbRDR6 in the inhibition of CWMV accumulation and biogenesis of CWMV siRNAs at higher temperatures.

    Original languageEnglish
    Pages (from-to)1165-1175
    Number of pages11
    JournalMolecular Plant-Microbe Interactions
    Volume26
    Issue number10
    DOIs
    Publication statusPublished - Oct 1 2013

    ASJC Scopus subject areas

    • Physiology
    • Agronomy and Crop Science

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