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MicroRNAs (miRNAs) are small, non-coding RNAs which typically function by guiding cleavage of target mRNAs. They play important roles in development, abiotic stress and responses to pathogens. Four small RNA libraries and four degradome libraries were constructed from the leaves and roots of healthy rice and plants infected with Rice black streaked dwarf virus (RBSDV). Analysis of the deep sequencing results showed that the expression patterns of 14 miRNAs in leaves and 16 miRNAs in roots changed significantly in response to RBSDV infection. Some responses were similar in roots and leaves, but many miRNAs responded differently in different tissues. The results were confirmed for selected miRNAs by quantitative real-time PCR. By using degradome sequencing, a total of 104 target transcripts for 17 conserved and 16 non-conserved miRNAs were shown to be responsive to RBSDV infection. Fifteen novel miRNAs were also identified by small RNA and degradome sequencing. The results provide new insights into the regulatory networks of miRNAs and their targets in different plant tissues in response to virus infection.

Genome-Wide Characterization of Rice Black Streaked Dwarf Virus-Responsive MicroRNAs in Rice Leaves and Roots by Small RNA and Degradome Sequencing