Three biological replicates (3 plants each) of wild-type (WT) and PpBURP-OE1 plants were sampled for RNA sequencing. The total RNA was extracted using the TRIZol™ Reagent (Life Technologies). RNA-seq library was constructed with the TruSeq RNA Sample Preparation v2 Guide (Illumina), and RNA sequencing was conducted with Illumina Hiseq 2,500 at Shanghai Personal Biotechnology Co., Ltd. (Shanghai, China). After filtering adapters and low-quality reads, the paired-end reads were then aligned to the reference genome of rice using HISAT2 v2.1.0 (Kim et al., 2019 (link)). Fragments per kilobase per million mapped (FPKM) reads was then calculated to estimate the expression level of the genes. Analysis of Gene Ontology (GO)7 enrichment was implemented by GOseq in R/Bioconductor packages based on the Wallenius non-central hypergeometric distribution (Young et al., 2010 (link)).
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