Effect of Temperature and Light on the Growth of Algae Species a Review
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The New Phytologist
Published By: Wiley
https://www. jstor .org/stable/2434905
Genotypic variation in the temperature optimum for resource-saturated growth of microalgae has been used to provide envelopes of μm (maximum specific growth rate) as a function of temperature. The Q10 value for μm for batch-cultured algae with optimal growth temperatures in the range v-40 ⚬C is i.88; rather higher values (Q10 = 2.08-2.19) are found, admitting with lower μ values at a given temperature, for continuous cultures. The envelope arroyo selects μm values for the smallest cells from the taxa (members of the Chlorophyta and Bacillariophyta) with the highest μm values at a given temperature. Larger cell size, or membership of the Dinophyta, gives a decreased μm at a given temperature. Phenotypic alter in μ, within a given genotype grown at sub-optimal temperatures, has a Q10 in excess of 1.88. Analysis of constraints on the resources-saturated value of μ in the fastest-growing micro-algae suggest that, at their temperature optima, the cells are close (within a factor of 2) to their maximum potential growth rate, based on the known kinetic properties of their catalysts, the need for kinetic heterogenity in catalyses in metabolic pathways, and the need to allocate some cell resources to structural and storage components. Phenotypic and genotypic responses to lower temperatures for growth, in terms of reallocation of resource to increment the quantity per unit biomass of catalysts every bit a means of offsetting lower catalytic chapters at lower temperatures, are limited. An exception is the light-harvesting and reaction centre apparatus which catalyses the temperature-insensitive processes of light absorption, excitation free energy transfer and primary photochemistry, and which is present (as assayed by photosynthetic paint per unit biomass) in smaller relative amounts during resource-saturated growth at lower temperatures. The involvement of other depression temperature 'adaptations' (eastward.chiliad. homeoviscous behaviour of thylakoid membranes) in offsetting low temperature effects on catalytic rates is not articulate. The scope for increasing the quantity of temperature-sensitive catalysts in the biomass as a means of offsetting the furnishings of low temperature on resources-saturated μ is potentially higher in the Dinophyta with their relatively low μm at their temperature optimum; however, this option does non appear to exist taken upwards by the Dinophyta which have unexceptional Q10 values for μm. For resources-express growth, the phenotypic effect of suboptimal temperatures on growth, when light is the limiting resource, is often less marked than when growth is light saturated. When a chemic nutrient is limiting, the temperature effect on growth of a given genotype is oft, but not invariably, decreased. Cases in which the upshot of temperature on growth charge per unit is decreased under light-limiting conditions tin can exist interpreted in terms of the intrinsically low Q10 of growth when temperature-insensitive reactions (low-cal absorption, excitation free energy transfer, primary photochemistry) are limiting and the acclimatory furnishings of changed temperature and calorie-free regimes for growth on resource allocation between pigment-protein complexes and downstream catalysts of temperature-sensitive reactions. Cases in which light-limited growth rate is quite temperature sensitive may be accounted for by a decrease in absorptance as a event of a lower paint content per cell at low growth temperatures. For growth limited by chemical nutrients, the variable responses make analysis difficult. Information technology is tempting to assign a low Q10 for μ under these conditions to a limitation by some transport process (diffusion through unstirred layers, or, less plausibly, the prison cell membrane) with a low Q10, although the evidence favouring this estimation is not abundant.
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Source: https://www.jstor.org/stable/2434905
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