L., 2015).Northern-Blot AnalysistRNA purification and northern-blot analysis were carried out as described previously (Duch e and Mar hal-Drouard, 2001). tRNA was extracted from whole tissue (total) and purified mitochondria from 2-week-old seedlings. tRNA was separated on 15 polyacrylamide gels and transferred to Hybond nylon membranes. Hybridization was carried out using the oligonucleotides sp