Ca²⁺‐ AND MG²⁺‐STIMULATED ATPases FROM ROOTS OF PLANTAGO SPECIES: RESPONSE TO DIFFERENT LIGHT ENERGY FLUXES

Abstract

SUMMARYPlants 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 effects of exogenously applied plant growth substances on the physiological plasticity in Plantago major ssp. pleiosperma: Responses of growth, shoot to root ratio and respiration

“…The effects of the strength of the nutrient solution upon RGR, shoot to root ratio and respiration in plants of P. major spp, pleiosperma were in agreement with previous experiments (Kuiper 1983a): a lower RGR both in roots and shoots (Tabs 1 and 2), except for the RGR of the roots during period I, a lower shoot to root ratio (Figs 1 and 2) and lower respiratory activities (Figs 3 and 4, Tab, 5) in 2% plants. These responses were very rapid upon a transfer from a 100% to a 2% solution.…”

“…These responses were very rapid upon a transfer from a 100% to a 2% solution. The rapid responses in the present experiments and the genotypical differences in the rate at which plastic responses take place in inbred lines of P. major (Kuiper 1982(Kuiper , 1983a) and in other Plantago species (Kuiper 1983b), suggest some kind of growth regulation, which cannot easily be ascribed to differences in contents of essential minerals in the plant tissues (cf. Saiama et al 1979),…”

“…Previous studies have described differences in physiological plasticity, defined as all intragenotypic variation in physioiogica! characteristics that can logically be connected with changes in environmental conditions between genotypes (Kuiper 1982(Kuiper , 1983a) and ecotypes of Plantago major L, ssp, major L, (Kuiper andSmid 1985, Kuiper andStaal 1986) and between populations of Plantago lanceoiata L, (Kuiper 1985), The differences in physiological plasticity were mostly derived from experiments in which the mineral nutrition had been altered. Because of the large differences in plastic responses-in amplitude as well as in the reaction timebetween the actual change of the environmental factor and the plant response, we supposed an intermediary role of plant growth substances.…”

Ultracytochemical and Biochemical Studies of Plasma Membrane Atpase in the Individual Parts of the Mature, Dormant Seed of Pisum Sativum

“…The amount of variability evident in our biochemical results in general is greater than preferred; however, it is consistent with that reported in much of the literature (Kylin and Kahr, 1973;Kuiper andKuiper, 1979a, 1979b;Cambraia and Hodges, 1980;Marre, 1980;Perlin and Spanswick, 1981;Jian, Sun, and Dong, 1982). Variability in studies of this type may be due to a variety of factors other than experimental error, such as chance orientation of membrane vesicles (Browning, Hall, and Baker, 1980;Cambraia and Hodges, 1980; Marre, 1980), proteases present in the crude homogenate (Perlin and Spanswick, 1981), the nutritional status or microenvironment of the parent plant (Kylin and Kahr, 1973;Kuiper and Kuiper, 1979a, b, c;Jian et aI., 1982;Kuiper, 1983), or genetic variability in amounts of ATPase among individual seeds.…”