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Ca 2+ ‐ AND MG 2+ ‐STIMULATED ATPases FROM ROOTS OF PLANTAGO SPECIES: RESPONSE TO DIFFERENT LIGHT ENERGY FLUXES
Author(s) -
KUIPER DAAN
Publication year - 1983
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1983.tb02718.x
Subject(s) - plantago , shoot , botany , biology , atpase , phenotypic plasticity , horticulture , enzyme , biochemistry , ecology
S ummary Plants of four Plantago species: P. major L ssp. major L, P. lanceolata L, P. media L and P. coronopus L were grown at two light energy fluxes. In all species, except P. major spp major , the growth of the root was more depressed with low light than that of the shoot, resulting in an increased shoot to root ratio. The shoot to root ratio of P. major ssp major was similar at both light energy fluxes. The Ca 2+ ‐ and Mg 2+ ‐stimulated ATPase activity of microsomal preparations of the roots was also studied. The capacity values ( V max ) of both ATPase activities were usually low in P. major ssp. major and the highest V max value for the Ca 2+ ‐stimulated ATPase activity was demonstrated in P. media. Both ATPase activities (Ca 2+ and Mg 2+ ) were lower in plants grown with low light except in P. major ssp major , which showed the same V max values for enzyme activity in plants grown at both light levels. The lack of response of P. major ssp major to different light energy fluxes is interpreted as a lack of phenotypic plasticity of this species. The data are compared with previous results on plasticity as a response to mineral nutrition. Phenotypic plasticity is discussed as a factor in the plant's strategy for survival.