2/18/2023 0 Comments Iina l. shelton found deadThis study investigates whether (i) the cuticular permeability of a desert plant is lower than that of species from non-desert habitats, (ii) the temperature-dependent increase of permeability is less pronounced than in those species and (iii) whether the susceptibility of the cuticular permeability barrier to high temperatures is related to the amounts or properties of the cutin or the cuticular waxes. Currently, the temperature dependence of the leaf cuticular water permeability and its relationship with the chemistry of the cuticles are not known for a single desert plant. Maintaining the integrity of the cuticular transpiration barrier even at elevated temperatures is of vital importance especially for hot-desert plants. Published by Oxford University Press on behalf of the Annals of Botany Company.Įffectiveness of cuticular transpiration barriers in a desert plant at controlling water loss at high temperatures We propose that the triterpenoids deposited within the cutin matrix restrict the thermal expansion of the polymer and, thus, prevent thermal damage to the highly ordered aliphatic wax barrier even at high temperatures. In comparison with many other species, the triterpenoid-to-cutin ratio of R. The leaf cuticular wax (251.4 μg cm(-2)) is mainly composed of pentacyclic triterpenoids (85.2% of total wax) while long-chain aliphatics contribute only 3.4%. For identifying the chemical and physical foundation of this phenomenon, the amounts and the compositions of cuticular waxes and cutin were determined. Rhazya stricta is also special since the temperature dependence of gmin does not become steeper above a certain transition temperature. stricta, the effect of temperature (15-50 Â☌) on gmin (2.4-fold) is lower than in all other species (up to 12-fold). stricta (5.41 Ã- 10(-5) m s(-1) at 25 Â☌) is in the upper range of all existing data for woody species from various non-desert habitats. We test these questions with Rhazya stricta using the minimum leaf water vapour conductance (gmin) as a proxy for cuticular water permeability. Schuster, Ann-Christin Burghardt, Markus Alfarhan, Ahmed Bueno, Amauri Hedrich, Rainer Leide, Jana Thomas, Jacob Riederer, Markus Effectiveness of cuticular transpiration barriers in a desert plant at controlling water loss at high temperatures.
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