The growth chamber was set to cycle between 20C for 12 hours and 18C for the next 12 hours, and the soil was kept moist by gently spraying with water every 72 hours.  Continuous light: Samples harvested after growing them firt in continuous dark for 8 days after germination followed by 48hrs (48LL) of continuous exposure to light (120µmol/m2/sec at soil surface). Therefore the samples were harvested after 12 days after germination (12DAG) with last two days with continuous light exposure. Total RNA from frozen seedling shoot sample was extracted as per manufacturer's protocol using RNA Plant reagent (Invitrogen Inc., USA), RNeasy kits (Qiagen Inc., USA), and treated with RNase-free DNase (Life Technologies Inc., USA)  True-Seq kit (Illumina Inc.) was used to prepare RNA-seq libraries, according to the manufacture's protocol.