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    STUDIA BIOLOGIA - Issue no. 2 / 2005  
         
  Article:   STUDII ECOFIZIOLOGICE LA PLANTE ARBUSTIVE ENDEMICE SUB PRESIUNEA FACTORILOR DE HABITAT. II. EVOLUŢIA CONŢINUTULUI ÎN PIGMENŢI ASIMILATORI.

Authors:  VICTOR BERCEA. 		 
       
         
  Abstract:  Ecophysiological Studies of Endemic Shrubs Exposed to Habitat Factors’ Pressure. II. The Dynamic of Assimilatory Pigment Contents. This study describes the photosynthetic capacity in different vegetation periods and at different altitudes in endemic shrubs Rhododendron myrtifolium L. and Vaccinium myrtillus L. The photosynthetic capacity was estimated on the grounds of assimilatory pigments composition. This composition was analyzed during June (blooming period in Rhododendron), July and September (leaf senescence) vegetation periods. In Rhododendron, a highly variability in chlorophyll content between populations was detected, negatively correlated with altitude. During vegetative cycle, assimilatory pigments level increased in July and decreased in September due to the beginning of foliage senescence. At highly altitude of 1930 m, the shrub population accumulated the lowest levels of assimilatory pigments. This decreasing of chlorophyll index is based on a growing of foliage weight. In Vaccinium myrtillus, the amount of chlorophyll a per leaf area unit increased with 13% along with altitude gradient, denoting an enlargement of light absorption area. The short vegetation cycle, as well as the unpredictable climatic changes, influences the photosynthesis in alpine shrubs.  
         
     
         
         
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