DNA sequences of ZmBAM7 (NP_001337631.1) were obtained from NCBI (https://www.ncbi.nlm.nih.gov/). The sequence of ZmBAM7-S was determined based on its in-frame start codon prediction 42 bases 5’ to the start of exon 2. The lengths of the predicted chloroplast transit peptides were determined using TargetP-2.0 (http://www.cbs.dtu.dk/services/TargetP/; Armenteros et al., 2019).