1 The interesting with the tree produced (especially from DOGMA) is
2 that organisms resulting from the first endosymbiosis are distributed in
3 every of the lineage found in the chloroplast genome structure
4 evolution: with Red Algae chloroplasts together in one lineage, and
5 Green Algae and Land Plants chloroplasts together in antoher lineage;
6 while oranisms resulting from secondary endosymbioses are localized in
7 the tree: both the chloroplasts of Brown Algae and Dinoflagellates
8 representatives are found exclusively in the lineage also comprising the
9 Red Algae chloroplasts from which they evolved, while the Euglens
10 chloroplasts are related to the Green Algae chloroplasts from which they
11 evolved. This make sense in term of biology and history of lineages and
12 theories of chloroplasts (and so photosynthetic ability) origins in
13 different Eucaryotic lineages.
14 Interestingly, The sole organisms included that possesses a
15 chloroplast (and so a chloroplastic genome) but that have lost the
16 photosynthetic ability (being parasitic plant) are found at the base of
17 the tree, and not together with its related species phylogenetically,
18 meaning that functional chloroplast genes are evolutionnary constrained
19 when used in photosynthetic process, but loose rapidly their efficiency
20 when not used. They are Cuscuta-grovonii an Angiosperm (flowering plant)
21 at the base of the DOGMA Angiosperm-Conifers branch, and
22 Epipactis-virginiana also an Angiosperm at the complete base of the tree.
23 Another interesting result in your work is that Land Plants that
24 represent single sublineage originating from the large and diverse
25 lineage of Green Algae in Eucaryots history are present in two different
26 branches of the DOGMA tree, associated with Green Algae, one branch
27 comprising the "inferior" Land Plants (mosses and ferns) and the second
28 comprising the "superior" Land Plants (Conifers and flowering plants).
29 But independently of their split in two distinct branches of the DOGMA
30 tree, the Land Plants always show a higher number of functional genes in
31 their chloroplasts than their related Green Algae, probably meaning that
32 terrestrial way of life necessitates more functional genes for an
33 optimal photosynthesis than marine way of life. But a more detailed
34 analysis of selected genes is necessary to better understad the reasons why.
