Total RNA of leaves, roots, xylem and phloem from Poplar 84K and LBD15-oe plants were isolated by RNA Easy Fast Plant Tissue Kit (TIANGEN, Beijing, China). The cDNA was generated by reverse transcription using FastKing RT Kit (TIANGEN, Beijing, China). The qRT-PCR analysis of m6A pathway genes were performed with SYBR® rapid quantitative PCR Kit (KAPA KK4601, Pleasanton, CA, USA) using the methods described previously [35 ]. Pagactin was used as a reference [24 (link)]. The primers of all the genes were listed in Table S5, and the results were analyzed using the 2−ΔΔCt method [24 (link)].
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