2.6. Quantitative real time PCR analyses
Briefly, 1 lg total RNA was digested by DNaseI (Invitrogen,
Carlsbad, CA, USA) and then used for first-stand cDNA synthesis
using a SuperScript III Reverse Transcriptase kit (Invitrogen),
according to the manufacturer’s instructions. Quantitative real
time (qRT)-PCR was performed using a LightCycler 480 detection
system (Roche, Basel, Switzerland) using an SYBR Green kit
(Roche). Primers for qRT-PCR analysis of CMS or MPR25 transcripts
are listed in Supplementary Table S1. The rice Actin1 gene
(LOC_Os03g50890) was used as an internal reference to normalize
the transcript levels of tested genes. Three biological repeats were
analyzed.