Green roofs in the Mediterranean region are often exposed to high levels of radiation, extreme temperatures, and an inconsistent water supply. The decrease in leaf absorptance is the result of an increase in pubescence density and thickness. Both of those structures have a specific function that helps elephants survive. This morphological trait variation suggests high diversity that may help in planning germplasm management and conservation, as well as breeding strategies in the future. Main conclusions ... A covering of soft down or short hairs, as on certain plants and insects.... Pubescence - definition of pubescence by The Free Dictionary. Published: 2001. In its native habitat where air temperatures often, Atriplex hymenelytra is an evergreen shrub distributed in the hot deserts of parts of Mexico and the southwestern United States. Leaves with the dense hair present were warmer than hairless leaves. With this research, we will have insights on the mechanisms explaining tree response to this unique seasonal climate in the Southwestern US. All rights reserved. L’examen taxonomique à travers les analyses morphologiques, micromorphologiques et morphométriques menées sur différents peuplements de ce complexe nous a permis de proposer une clé d’identification pour les trois principaux taxons rencontrés en Algérie, à savoir, Quercus canariensis Willd., Q. f subsp. This seminal study clearly concluded that the higher the light reflected by adaxial trichomes the lower the leaf temperature and transpiration. Some seeds that are sensitive to light such as tobacco and lettuce exhibit poor germination in the absence of sunlight. Wood, J. G. 1934. (s.l) in Algeria, the ecology of its formations in the Aures region, and the acorn germination potential of one of its species, i.e. At these times the light intensity required for saturation of photosynthesis is low and a reduction in the radiation absorbed by the leaves therefore results in a greater water-use efficiency. presence of trichomes, papil-lary cell, and, on the adaxial face, special provision in the arrangement of stomata and epicuticle wax patterns), characteristics that might be related to pest resistance. The pubescence reduces leaf absorptance resulting in a reduced heat load, and as a consequence lower leaf temperatures and lower transpiration rates. Allelopathy can also induce the germination and growth inhibition of neighboring plants. Our genome‐wide association study in oilseed rape identified new genes, such as BnaA.GL1.a, BnaC.SWEET4.a, BnaC.WAT1.a and BnaC.WAT1.b, that associate with leaf trichome formation, indicating the role of sugar and auxin signalling in leaf trichome initiation of oilseed rape. Leaf pubescence has several important roles, including regulating heat balance, reducing damage from UV radiation, minimizing water loss and reducing herbivory. The coefficients of reflection for the arid zone species covered a wide range of Vascular land plants. Leaf absorptance to solar radiation is diminished by the presence of pubescence. Free to read & use tolerance, glume pubescence, wheat. Hairs were removed from upper surfaces of leaves of Gynura aurantiaca (velvet plant) with an electric razor. Results: The results showed that the leaf blade anatomical structure of all the varieties in general terms show differences. 28(2) 141 - 148 Under high irradiances and normal atmospheric conditions the two species have high photosynthetic rates, exceeding 3 nanomoles of CO(2) per square centimeter per second (48 milligrams of CO(2) per square decimeter per hour) and complete light saturation does not occur by full noon sunlight. When the effects of pubescence are taken into account, there are few if any significant differences in the photosynthetic characteristics of the two species. Plant materials and breeding: Several populations were created for mapping leaf trait QTL. Terrestrial seed plant species share similar physiological and metabolic processes for fluxes of gases (CO2, O2, H2O), nutrients, and energy, while differences are primarily consequences of how these properties are distributed and their physical structures. 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