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Rezumat articol ediţie STUDIA UNIVERSITATIS BABEÅž-BOLYAI
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Rezumat: Ecophysiological Studies of Endemic Shrubs Exposed to Habitat Factors’ Pressure. III. Study on some Cellular Components (Proteins and Carbohydrates). This study focuses on the variation of metabolical components in vegetative organs during different vegetation stages, and their possible implication in acclimation process (resistance), in two species of endemic shrubs: Rhododendron myrtifolium L. and Vaccinium myrtillus L. The data obtained during a period of three vegetation cycles showed a logarithmic relationship between biomass, carbohydrates and proteins amounts with respect to altitudinal gradient of stationary plots. During the vegetative cycle in Rhododendron, the accumulation of cellular proteins intensified in July and then decreased in September, the highest amounts being observed at superior altitudes. Carbohydrates accumulation increased in June, decreased in July, and then intensified again in September, both positive and negative variations being directly correlated with altitude. Similarly, in Vaccinium, intense accumulation of cellular proteins occurred in July and declined in September, the highest levels being registered at superior altitudes. The two species exhibit different biochemical features. Thus, Vaccinium presented a higher level in proteins, while Rhododendron distinguished itself by a higher level in carbohydrates. Both species showed a growing accumulation of carbohydrates in September. The richness in cellular proteins mirrors an increasing enzymatic capacity of using and distributing the photochemical energy. The propensity of maintaining a high biomass level in September, together with the growing amounts of carbohydrates and cellular proteins, argument the role of these components in the resistance mechanism under abiotic factors. |
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