Construction and significance analysis of the MicroRNA expression profile of Hemerocallis fulva at low temperature

Abstract

MicroRNA (miRNA) identification was performed in Hemerocallis fulva by high-throughput sequencing in combination with bioinformatics prediction. A total of 14,843,184 and 16,072,575 RNA sequences were explored under normal and low temperature conditions, respectively. There was a significant difference in RNAs species and quantity between the two samples. Of all the miRNAs, 26 were significantly upregulated and 30 were significantly downregulated, while nine were either significantly upregulated or downregulated under low-temperature stress. Twenty-one highly expressed miRNA families were screened in at least six species. The number of miRNA families was very similar between monocotyledons and dicotyledons, and only a few were more frequently found in monocotyledons.

Key words:

• Hemerocallis fulva
• miRNA
• environmental stress
• high-throughput sequencing
• gene expression profile

Funding

This study was supported by the Science and Technology Project of the Heilongjiang Forestry Industry General Bureau [sgzjY2010026] and the Key Laboratory for Agricultural Biological Functional Genes of Northeast Agricultural University [NSGJ2012-10].

Notes

Abbreviations: NGS, Next-generation sequencing.