The plant hormone auxin triggers distinct phosphorylation responses in the two different generations of the fern Ceratopteris richardii

The fern Ceratopteris richardii has two distinct generations: the haploid gametophyte and diploid sporophyte, which resembles the difference between the major land plant clades of bryophytes and tracheophytes. We profiled the fast auxin-dependent phosphorylation response in both generations to identify the shared evolutionary targets and differences between the two generations