Fresh young leaf samples were frozen on dry ice in the field and stored at − 80 °C until total RNA extraction. Preliminary RNA precipitation [29 (link), 30 (link)] as performed prior to total RNA extraction with the Qiagen RNeasy Plant Mini Kit protocol with DNase treatment (Qiagen, Hilden, Germany). RNA-Seq libraries with insert length 100–380 bp (mode = 170 bp) were prepared from 4 μg of RNA using an Illumina TruSeq RNA Sample Prep Kit. Each library was uniquely tagged using 12 TruSeq indexed adapters (numbers 1–12) to enable 12-plexing of samples in each Illumina HiSeq 2000 lane.
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