library_construction_protocol: The miRNA-seq and degradome-seq were carried out by Lianchuan Bio (Hangzhou, China). Nine sample sRNA sequencing libraries were prepared using the TruSeq Small RNA Sample Prep Kits (Illumina, San Diego, USA) and sequenced using the Illumina Hiseq2000/2500 with a read length of 1 X 50 bp. Raw reads were subjected to an in-house program, ACGT101-miR (LC Sciences, Houston, Texas, USA) to remove adapter dimers, junk, low complexity, common RNA families (rRNA, tRNA, snRNA, snoRNA) and repeats. Subsequently, unique sequences with length in 18~25 nucleotide were mapped to specific species precursors in miRBase 22.0 by BLAST search to identify known miRNAs and novel 3p- and 5p- derived miRNAs.