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Seed Germination and Seedling Establishment Assays
After surface sterilization of the seeds, stratification was conducted in the dark
at 4¡ãC for 3 d. Next, ;100 seeds of each genotype were sown on MS plates
lacking or supplemented with 0.5 mM ABA, 150 mM NaCl, or 400 mM
mannitol. In the analyses of iDDA1 lines, 1 mMABAwas used and b-estradiol
was added to medium at 10 mM final concentration as stated. To score seed
germination, radicle emergence was analyzed at 72 and 96 h after sowing.
Seedling establishment was scored after 5 d as the percentage of seeds that
developed green expanded cotyledons and the first pair of true leaves.
Root Growth Assays
Seedlings were grown on vertically oriented MS plates for 4 to 5 d. Afterward,
20 plants were transferred to new MS plates lacking or supplemented
with 10 mM ABA. The plates were scanned on a flatbed scanner
after 10 d to produce image files suitable for quantitative analysis of root
growth using ImageJ version 1.37 software
Phylogenetic Analysis
DDA1 homologs were searched in different databases, Plaza (https://
bioinformatics.psb.ugent.be/plaza/), Phytozome (https://www.phytozome.net),
Gramene (https://www.gramene.org), TAIR (https://www.arabidopsis.org), and
GenBank (https://www.ncbi.nlm.nih.gov), using web-hosted BLAST applications
(https://blast.ncbi.nlm.nih.gov/Blast.cgi). All truncated DDA1 sequences
were excluded in subsequent analyses. Sequences were aligned using
ClustalW2 (https://www.ebi.ac.uk/Tools/msa/clustalw2/) with the Gonnet
protein comparison matrix and default parameters (gap opening penalty of
10 and gap extension penalty of 0.1 for initial pairwise alignment; gap
opening penalty of 10 and gap extension penalty of 0.2 for the multiple
alignment; with residue-specific and hydrophilic residue penalties, a gap
separation distance of 4 and a 30% delay divergent cutoff) and then
manually inspected to check for possible misalignments (Supplemental
Data Set 1). The best model fitting the alignment was selected using
ProtTest (Abascal et al., 2005), which corresponded to a Jones-Taylor-
Thornton model for amino acid substitution with a discrete gamma distribution
(four categories), a proportion of invariant, and an initial BIONJ tree.
This model was used to conduct a maximum likelihood analysis with
bootstrapping using 1000 replicates using the MEGA 5 (https://www.
megasoftware.net/) software. The gaps/missing treatment parameter was
set to complete deletion. The more distant homologs, from Selaginella
moellendorffii and Picea glauca, were used as an outgroup to root the
resulting phylogenetic tree.

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