title: RNA-Seq of A. thaliana hypocotyls pif4 nitrate upshift2
design: 1)mRNA enrichment and purification: rRNA depletion or Oligo dT Selection to enrich the mRNA 2)RNA fragment and reverse transcription 3)End repair, add A and adaptor ligation 4)RCR amplification 5)Single strand separation and cyclization 6)DNA nanoball synthesis 7)Sequencing on DNBseq platform