An evolutionary study of chlorophyll biosynthetic heterogeneity in green plants
1994
Ioannides, I.M. | Fasoula, D.A. | Robertson, K.R. | Rebeiz, C.A.
Chlorophyll biosynthetic heterogeneity among plant species was investigated to determine the stability of a greening group within a species, the effects of age and treatment with chemical compounds on greening groups, and possible relationships of chlorophyll heterogeneity with existing classification schemes. Green plants exhibited one of three different greening groups, depending upon the chlorophyll biosynthetic route that is used to form monovinyl (MV) or divinyl (DV) protochlorophyllides, Algae, bryophytes, ferns, and gymnosperms belonged exclusively to the dark divinyl-light divinyl (DDV-LDV) greening group. Angiosperms exhibited all three greening groups. Most angiosperm species examined belonged to the dark monovinyl-light divinyl (DMV-LDV) greening group, and several belonged to the DDV-LDV group. The dark monovinyl-light monovinyl (DMV-LMV) greening group was rare and confined to derived groups in Cronquist's classification scheme. On the basis of these results, it is proposed that the DDV-LDV greening group is ancestral in green plants, the DMV-LMV group derived, and the DMV-LDV group evolutionarily intermediate. However, within angiosperms, present data indicate that DMV-LDV is ancestral, DMV-LMV is advanced and DDV-LDV is secondarily derived.
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