1,720,981 research outputs found
Synthesis of DNA and RNA in the quiescent center of the primary root of Calystegia soldanella
No full textDuration of the mitotic cycle of Ornithogalum umbellatum as measured by [3H]thymidine in the root meristem
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RNA synthesis and immunogold localization of 5-methylcytosine rich regions in polytene chromosomes of Phaseolus coccineus L. embryo suspensor, at two stages of embryogenesis
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2. Different structure of polytene chromosomes of Phaseolus coccineus suspensors during early embriogenesis. I. Nucleolus organizing chromosome pairs S1 and S2
No full textDistribution of 5-methylcytosine-rich regions in the polytene chromosomes of Phaseolus coccineus embryo suspensor as shown by the immunoperoxidase technique
No full textRoot apical meristems of Allium porrum L. as affected by arbuscular mycorrhizae and phosphorus
No full textMorpho-physiological plasticity contributes to tolerance of Calluna vulgaris in an active geothermal field
Full text linkGeothermal alteration fields are very prohibitive environments, limiting vegetation establishment and growth. In the present study, the ecological specialisation of the pioneer plant Calluna vulgaris (L.) Hull was investigated, assuming that its ability to survive in geothermal habitats derives from a fine regulation of morpho-physiological traits. Mature leaves of C. vulgaris were sampled from plants close to a fumarole (near), and from plants living at a distance of some metres (intermediate) or ~1 km (distant) from a fumarole. Along the sampling sites, a gradient of soil-pH and temperature values occurred, with near plants facing the highest soil temperature and the lowest soil pH. A regulation of constitutive morpho-anatomical and physiological traits in response to different stress levels occurred. A progressive reduction of leaf exposed surface and hair density and mucilages, combined with a gradual increase of oxidative stress levels, of phenols and ascorbate, was observed from distant to near plants. Near plants showed an increase in stomatal density and in lignin and cuticle thickness, and the highest activity of ascorbate peroxidase. Except for high glutathione concentrations, in distant plants antioxidant machinery was consistently less active. The apparent morphological and physiological plasticity demonstrated in the present research contributed to the capability of these plants to tolerate the prohibitive, highly changing environmental conditions of the geothermal field
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