library_construction_protocol: Total RNA was extracted from three individual shoot apices, per genotype (mutant and wild-type) pool, using the Qiagen RNeasy Plant Mini Kit (Cat. No. 74904). Subsequent DNase treatment was done using the Ambion® TURBO DNA-free™ Kit (Cat. No. AM1907). RNA quantity was checked and normalized using a Qubit™ RNA HS Assay Kit (Cat. No. Q32852). RNA quality was assessed with an Agilent RNA 6000 Nano Kit (5067-1511) ensuring that all RNA used for library preparation had a RIN value of 9.0. Strand-specific RNA sequencing library preparation and sequencing was conducted by the Oxford Genomics Centre at the Wellcome Centre for Human Genetics (funded by Wellcome Trust grant reference 203141/A/16/Z) RNA-Seq was performed on an Illumina NovaSeq 6000 with paired-end 150-bp reads