title: DK
design: Total RNA was extracted from leaf tissues using the RNeasy Plant Mini kit (Qiagen, Valencia, CA) following the manufacturer's recommended protocols. The quality and integrity of RNA samples were checked using Pico bioanalyzer chips (Agilent 2100 Bioanalyzer, Santa Clara, CA) at the Keck Center for Comparative and Functional Genomic, University of Illinois at Urbana-Champaign. Library construction and sequencing on Illumina HiSeq 2500 were conducted at the Keck Center for High-Throughput Sequencing and Genotyping, University of Illinois at Urbana-Champaign.