Characterization and analysis of multi-organ full-length transcriptomes in Sphaeropteris brunoniana and Alsophila latebrosa highlight secondary metabolism and chloroplast RNA editing pattern of tree ferns

Table 5 Likelihood ratio test and positive selection sites based on M1a model and M2a model

Genes	D.f	2Δℓ	P-value	Positive selection sites
atpH	2	14.704	6.412 × 10^–4	4L* 75L**
psaA	2	0.000	1.000	None
psaB	2	0.000	1.000	None
psbB	2	0.000	1.000	None
psbC	2	0.000	1.000	None
psbD	2	0.000	1.000	None
psbE	2	10.880	4.339 × 10^–3	30L**
psbF	2	0.327	0.849	None
psbH	2	0.000	1.000	None
psbI	2	0.203	0.904	None
psbK	2	0.000	1.000	None
psbL	2	11.921	2.579 × 10^–3	13S* 31L**
psbT	2	0.142	0.931	None
rbcL	2	0.001	1.000	251L*
rpl21	2	4.803	0.091	None
rpl32	2	41.609	9.222 × 10^–3	63P* 64S**
rps14	2	3.017	0.221	None
ycf12	2	0.000	1.000	None

ISSN: 1471-2229