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Spectral forms of chlorophyll synthesized in the absence of light by seedlings of relict coniferous plants


, : Spectral forms of chlorophyll synthesized in the absence of light by seedlings of relict coniferous plants. Zhurnal Obshchei Biologii 40(1): 128-137

Many phylogenetically ancient plant forms can synthesize chlorophyll in the absence of light at early ontogenetic stages. This ability was studied in the representatives of Gymnospermae, both relict and phylogenetically advanced forms. Using low-temperature fluorometry, 12 [Ginkgo biloba, Podocarpus macrophyllus D., Picea abies Karts., Cedrus deodara Lond., Pinus sylvestris L., Larix sibirica L., Cryptomeria japonica L., Sciadopitys verticillata L., Sequoia sempervivens Lamb., Sequoiadendron giganteum Linde., Metasequoia glyptostroboides Hu et Hung, Cercediphyllium manigifum Kai., Zelcova serrata Spach, Arbutus andrachue A. L. de Juss and Callistemon lanceolata A. L. de Juss spp. of Coniferophyta were compared. Representatives of all the families studies (Gingkoaceae, Pinaceae, Taxodiaceae, Podocarpaceae) are able, at a stage of primary leaves, to accumulate in the dark chlorophyll forms differing in the degree of molecular aggregation. In the relict angiosperms studied this ability was absent. A nonphotochemical pathway of chlorophyll biosynthesis is apparently present at the earliest stages of the evolution of Gymnospermae, which might be connected with germination conditions of the latter. Preservation of the ability for chlorophyll synthesis in the darkness at the seedling stage in now living species of Pinaceae and Taxodiaceae might point to a considerable adaptive lability of these plants. Further investigation into the peculiarities of formation of the pigment apparatus of coniferous plants will contribute to elucidation of some plant evolution problems.

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